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Chaptewr 5 Special Occupancies | 516.10(A)(6) | All electrically conductive objects in the spray area, except those objects required by the process to be at high voltage, shall be adequately grounded. This requirement shall apply to paint containers, wash cans, guards, hose connectors, brackets, and any other electrically conductive objects or devices in the area. Informational Note: See NFPA 33, Standard for Spray Application Using Flammable nr Combustible Materials; NFPA 34, Standard for Dipping, Coating, and Printing Processes Using Flammable or Combustible Liquids, and NFPA 77, Recommended Practice on Static Electricity, for information on grounding and bonding for static electricity purposes. [516.10(A)(6)](https://2023.antflix.net#516.10(A)(6)) | https://2023.antflix.net#516.10(A)(6) |
Chaptewr 5 Special Occupancies | 516.10(A)(7) | Safeguards such as adequate booths, fencing, railings, interlocks, or other means shall be placed about the equipment or incorporated therein so that they, either by their location, character, or both, ensure that a safe separation of the process is maintained. [516.10(A)(7)](https://2023.antflix.net#516.10(A)(7)) | https://2023.antflix.net#516.10(A)(7) |
Chaptewr 5 Special Occupancies | 516.10(A)(8) | Signs shall be conspicuously posted to convey the following: Designate the process zone as dangerous with regard to lire and accidentIdentify the grounding requirements for all electrically conductive objects in the spray areaRestrict access to qualified personnel only [516.10(A)(8)](https://2023.antflix.net#516.10(A)(8)) | https://2023.antflix.net#516.10(A)(8) |
Chaptewr 5 Special Occupancies | 516.10(A)(9) | All insulators shall be kept clean and dry. [516.10(A)(9)](https://2023.antflix.net#516.10(A)(9)) | https://2023.antflix.net#516.10(A)(9) |
Chaptewr 5 Special Occupancies | 516.10(A)(10) | Spray equipment that cannot be classified as nonincendive shall comply with 516.10(A) (10) (a) and (A) (10) (b). Conveyors, hangers, and application equipment shall be arranged so that a minimum separation of at least twice the sparking distance is maintained between the workpiece or material being sprayed and electrodes, electrostatic atomizing heads, or charged conductors. Warnings defining this safe distance shall be posted. [33:11.4.1]The equipment shall provide an automatic means of rapidly de-energizing the high-voltage elements in the event the distance between the goods being painted and the electrodes or electrostatic atomizing heads falls below that specified in 516.10(A)(10)(a). [33:11.3.8] [516.10(A)(10)](https://2023.antflix.net#516.10(A)(10)) | https://2023.antflix.net#516.10(A)(10) |
Chaptewr 5 Special Occupancies | 516.10(B) | This section shall apply to any equipment using electrostatically charged elements for the atomization, charging, or precipitation of flammable and combustible materials for coatings on articles, or for other similar purposes in which the charging or atomizing device is hand-held and manipulated during the spraying operation. Electrostatic hand-spraying equipment and devices used in connection with paint-spraying operations shall be of listed types and shall comply with 516.10(B)(1) through (B)(5). [516.10(B)](https://2023.antflix.net#516.10(B)) | https://2023.antflix.net#516.10(B) |
Chaptewr 5 Special Occupancies | 516.10(B)(1) | The high-voltage circuits shall be designed so as not to produce a spark of sufficient intensity to ignite the most readily ignitible of those vapor—air mixtures likely to be encountered or result in appreciable shock hazard upon coming in contact with a grounded object under all normal operating conditions. The electrostatically charged exposed elements of the handgun shall be capable of being energized only by an actuator that also controls the coating material supply. [516.10(B)(1)](https://2023.antflix.net#516.10(B)(1)) | https://2023.antflix.net#516.10(B)(1) |
Chaptewr 5 Special Occupancies | 516.10(B)(2) | Transformers, power packs, control apparatus, and all other electrical portions of the equipment shall be located outside of the Class I location or be identified for the location. Exception: The handgun itself and its connections to the power supply shall be permitted within the Class I location. [516.10(B)(2)](https://2023.antflix.net#516.10(B)(2)) | https://2023.antflix.net#516.10(B)(2) |
Chaptewr 5 Special Occupancies | 516.10(B)(3) | The handle of the spraying gun shall be electrically connected to ground by a conductive material and be constructed so that the operator in normal operating position is in electrical contact with the grounded handle with a resistance of not more than 1 megohm to prevent buildup of a static charge on the operator's body. Signs indicating the necessity for grounding other persons entering the spray area shall be conspicuously posted. [516.10(B)(3)](https://2023.antflix.net#516.10(B)(3)) | https://2023.antflix.net#516.10(B)(3) |
Chaptewr 5 Special Occupancies | 516.10(B)(4) | All electrically conductive objects in the spraying area, except those objects required by the process to be at high voltage shall be electrically connected to ground with a resistance of not more than 1 megohm. This requirement shall apply to paint containers, wash cans, and any other electrical conductive objects or devices in the area. The equipment shall carry a prominent, permanently installed warning regarding the necessity for this grounding feature. Informational Note: See NFPA 33, Standard for Spray Application Using Flammable or Combustible Materials, NFPA 34, Standard for Dipping, Coating, and Printing Processes Using Flammable or Combustible Liquids, and NFPA 77, Recommended Practice on Static Electricity, for information on grounding and bonding for static electricity purposes. [516.10(B)(4)](https://2023.antflix.net#516.10(B)(4)) | https://2023.antflix.net#516.10(B)(4) |
Chaptewr 5 Special Occupancies | 516.10(B)(5) | Objects being painted shall be maintained in electrical contact with the conveyor or other grounded support. Hooks shall be regularly cleaned to ensure adequate grounding of 1 megohm or less. Areas of contact shall be sharp points or knife edges where possible. Points of support of the object shall be concealed from random spray where feasible, and, where the objects being sprayed are supported from a conveyor, the point of attachment to the conveyor shall be located so as to not collect spray material during normal operation. [516.10(B)(5)](https://2023.antflix.net#516.10(B)(5)) | https://2023.antflix.net#516.10(B)(5) |
Chaptewr 5 Special Occupancies | 516.10(C) | This section shall apply to processes in which combustible dry powders are applied. The hazards associated with combustible dusts are present in such a process to a degree, depending on the chemical composition of the material, particle size, shape, and distribution. [516.10(C)](https://2023.antflix.net#516.10(C)) | https://2023.antflix.net#516.10(C) |
Chaptewr 5 Special Occupancies | 516.10(C)(1) | Electrical equipment and other sources of ignition shall comply with the requirements of Part III of Article 502 or 506.20, as applicable. Portable electric luminaires and other utilization equipment shall not be used within a Class II location during operation of the finishing processes. Such luminaires or utilization equipment used during cleaning or repairing operations shall be of a type identified for Class II, Division 1 locations and all exposed metal parts shall be connected to an equipment grounding conductor. Exception: Portable electric luminaires shall be of the type listed for Class II, Division 1 locations where required for operations in spaces not readily illuminated by fixed lighting within the spraying area and where readily ignitible residues might be present. [516.10(C)(1)](https://2023.antflix.net#516.10(C)(1)) | https://2023.antflix.net#516.10(C)(1) |
Chaptewr 5 Special Occupancies | 516.10(C)(2) | The provisions of 516.10(A) and 516.10(C)(1) shall apply to fixed electrostatic spraying equipment. [516.10(C)(2)](https://2023.antflix.net#516.10(C)(2)) | https://2023.antflix.net#516.10(C)(2) |
Chaptewr 5 Special Occupancies | 516.10(C)(3) | The provisions of 516.10(B) and 516.10(C)(1) shall apply to electrostatic hand-spraying equipment. [516.10(C)(3)](https://2023.antflix.net#516.10(C)(3)) | https://2023.antflix.net#516.10(C)(3) |
Chaptewr 5 Special Occupancies | 516.10(C)(4) | Electrostatic fluidized beds and associated equipment shall be of identified types. The high-voltage circuits shall be designed such that any discharge produced when the charging electrodes of the bed are approached or contacted by a grounded object shall not be of sufficient intensity to ignite any powder-air mixture likely to be encountered or to result in an appreciable shock hazard. Transformers, power packs, control apparatus, and all other electrical portions of the equipment shall be located outside the powder-coating area or shall otherwise comply with the requirements of 516.10(C)(1).Exception: The charging electrodes and their connections to the power supply shall be permitted within the powder-coating area.All electrically conductive objects within the powder-coating area shall be adequately grounded. The powder-coating equipment shall carry a prominent, permanently installed warning regarding the necessity for grounding these objects.Informational Note: See NFPA 33, Standard for Spray Application Using Flammable or Combustible Materials; NFPA 34, Standard for Dipping, Coating, and Printing Processes Using Flammable or Combustible Liquids; and NFPA 77, Recommended Practice on Static Electricity, for information on grounding and bonding for static electricity purposes.Objects being coated shall be maintained in electrical contact (less than 1 megohm) with the conveyor or other support in order to ensure proper grounding. Hangers shall be regularly cleaned to ensure effective electrical contact. Areas of electrical contact shall be sharp points or knife edges where possible.The electrical equipment and compressed air supplies shall be interlocked with a ventilation system so that the equipment cannot be operated unless the ventilating fans are in operation. [33:Chapter 15] [516.10(C)(4)](https://2023.antflix.net#516.10(C)(4)) | https://2023.antflix.net#516.10(C)(4) |
Chaptewr 5 Special Occupancies | 516.16 | All metal raceways, the metal armors or metallic sheath on cables, and all non—current-carrying metal parts of fixed or portable electrical equipment, regardless of voltage, shall be grounded and bonded. Grounding and bonding shall comply with 501.30, 502.30, or 505.30, as applicable. [516.16](https://2023.antflix.net#516.16) | https://2023.antflix.net#516.16 |
Chaptewr 5 Special Occupancies | 516.18 | Electrical area classification shall be as follows: The area within the membrane enclosure shall be considered a Class I, Division 1 area, as shown in Figure 516.18.A 1.5 m (5 ft) zone outside of the membrane enclosure shall be considered Class I, Division 2, as shown in Figure 516.18.Informational Note No. 1: See NFPA 33, Standard for Spray Application Using Flammable or Combustible Materials, for information on occupancy, ventilation, fire protection, and permitting for spray application operations in membrane enclosures. This document limits spray application operations within both outdoor and indoor temporary membrane enclosures, as well as use and time constraints. The risks to people and property are unique when spray painting within the confined spaces of temporary membrane enclosures.Informational Note No. 2: See NFPA 33, Standard for Spray Application Using Flammable or Combustible Materials, Section 18.6, for the limits of material used in a vertical plane for membrane enclosures.Informational Note No. 3: See NFPA 701, Standard Methods of Fire Tests for Flame Propagation of Textiles and Films, Test Method 2, for construction information.Informational Note No. 4: See NFPA 33, Standard for Spray Application Using Flammable or Combustible Materials, 18.3.2.1.1, for membrane installation beneath sprinklers.Informational Note No. 5: See NFPA 13, Standard for the Installation of Sprinkler Systems, 8.15.15, for information on the protection of membrane structures.FIGURE 516.18 Electrical Classifications for Outdoor Membrane Enclosures. [33:Figure 18.6.1.2] [516.18](https://2023.antflix.net#516.18) | https://2023.antflix.net#516.18 |
Chaptewr 5 Special Occupancies | 516.23 | Electrical wiring and utilization equipment used within the classified areas inside and outside of membrane enclosures during spray painting shall be suitable for the location and shall comply with all of the following: All power to the workpiece shall be removed during spray painting.Workpieces shall be grounded.Spray paint equipment shall be grounded.Scaffolding shall be bonded to the workpiece and grounded by an approved method. [516.23](https://2023.antflix.net#516.23) | https://2023.antflix.net#516.23 |
Chaptewr 5 Special Occupancies | 516.29 | Classification is based on quantities of flammable vapors, combustible mists, residues, dusts, or deposits that are present or might be present in quantities sufficient to produce ignitable or explosive mixtures with air. Electrical wiring and electrical utilization equipment located adjacent to open processes shall comply with the requirements as follows. Examples of these requirements are illustrated in Figure 516.29(1), Figure 516.29(2), Figure 516.29(3), and Figure 516.29(4). Informational Note: See NFPA 33, Standard for Spray Application Using Flammable or Combustible Materials, Chapter 6, and NFPA 34, Standard for Dipping, Coating, and Printing Processes Using Flammable nr Combustible Liquids, Chapter 6, for additional information.Electrical wiring and electrical utilization equipment located in any sump, pit, or below grade channel that is within 7620 mm (25 ft) horizontally of a vapor source, as defined by this standard, shall be suitable for Class I, Division 1 or Class I, Zone 1 locations. If the sump, pit, or channel extends beyond 7620 mm (25 ft) of the vapor source, it shall be provided with a vapor stop, or it shall be classified as Class I, Division 1 or Class I, Zone I for its entire length. [34:6.4.1]Electrical wiring and electrical utilization equipment located within 1525 mm (5 ft) of a vapor source shall be suitable for Class I, Division 1 or Class I, Zone 1 locations. The space inside a dip tank, ink fountain, ink reservoir, or ink tank shall be classified as Class I, Division 1 or Class I. Zone 0, whichever is applicable.Electrical wiring and electrical utilization equipment located within 915 mm (3 ft) of the Class I, Division 1 or Class I, Zone 1 location shall be suitable for Class I. Division 2 or Class I. Zone 2 locations, whichever is applicable.The space 915 mm (3 ft) above the floor and extending 6100 mm (20 ft) horizontally in all directions from the Class I, Division 1 or Class I, Zone 1 location shall be classified as Class I, Division 2 or Class I, Zone 2, and electrical wiring and electrical utilization equipment located within this space shall be suitable for Class I, Division 2 or Class I, Zone 2 locations, whichever is applicable.This space shall be permitted to be nonclassified for purposes of electrical installations if the surface area of the vapor source does not exceed 0.5 m2 (5 ft2), the contents of the dip tank, ink fountain, ink reservoir, or ink tank do not exceed 19 L (5 gal), and the vapor concentration during operating and shutdown periods does not exceed 25 percent of the lower flammable limit.FIGURE 516.29(1) Electrical Area Classification for Open Dipping and Coating Processes Without Vapor Containment or Ventilation. [34: Figure 6.4(a)]FIGURE 516.29(2) Electrical Area Classification for Open Dipping and Coating Processes with Peripheral Vapor Containment and Ventilation - Vapors Confined to Process Equipment. [34:Figure 6.4(b)]FIGURE 516.29(3) Electrical Area Classification for Open Dipping and Coating Processes with Partial Peripheral Vapor Containment and Ventilation - Vapors NOT Confined to Process Equipment. [34:Figure 6.4(c)]FIGURE 516.29(4) Electrical Area Classification for a Typical Printing Process. [34:Figure 6.4(d)] [516.29](https://2023.antflix.net#516.29) | https://2023.antflix.net#516.29 |
Chaptewr 5 Special Occupancies | 516.35 | Areas adjacent to enclosed dipping and coating processes are illustrated by Figure 516.35 and shall be classified as follows: The interior of any enclosed dipping or coating process or apparatus shall be a Class I, Division 1 or Class I, Zone 1 location, and electrical wiring and electrical utilization equipment located within this space shall be suitable for Class I, Division 1 or Class I, Zone 1 locations, whichever is applicable. The area inside the dip tank shall be classified as Class I, Division 1 or Class I, Zone 0, whichever is applicable.The space within 915 mm (3 ft) in all directions from any opening in the enclosure and extending to the floor or grade level shall be classified as Class I, Division 2 or Class I, Zone 2, and electrical wiring and electrical utilization equipment located within this space shall be suitable for Class I, Division 2 locations or Class I, Zone 2 locations, whichever is applicable.All other spaces adjacent to an enclosed dipping or coating process or apparatus shall be classified as nonhazardous for purposes of electrical installations.FIGURE 516.35 Electrical Area Classification Around Enclosed Dipping and Coating Processes. [34:Figure 6.5] [516.35](https://2023.antflix.net#516.35) | https://2023.antflix.net#516.35 |
Chaptewr 5 Special Occupancies | 516.36 | Open containers, supply containers, waste containers, and solvent distillation units that contain Class I liquids shall be located in areas ventilated in accordance with 516.4. [516.36](https://2023.antflix.net#516.36) | https://2023.antflix.net#516.36 |
Chaptewr 5 Special Occupancies | 516.37 | For printing, coating, and dipping equipment where the process area is enclosed by glass panels that are sealed to confine vapors and mists to the inside of the enclosure, luminaires that are attached to the walls or ceilings of a process enclosure and that are located outside of any classified area shall be permitted to be of general purpose construction. Such luminaires shall be serviced from outside the enclosure. Luminaires that are attached to the walls or ceilings of a process enclosure, are located within the Class I, Division 2 or Class I, Zone 2 location, and are separated from the process area by glass panels that are sealed to confine vapors and mists shall be suitable for use in that location. Such fixtures shall be serviced from outside the enclosure. [516.37](https://2023.antflix.net#516.37) | https://2023.antflix.net#516.37 |
Chaptewr 5 Special Occupancies | 516.38(A) | Fixed wiring above hazardous (classified) locations shall be permitted to be one or more of the following: Rigid metal conduit (RMC) or intermediate metal conduit (IMC) with listed threaded or threadless fittings, or electrical metallic tubing (EMT) or electrical nonmetallic tubing (Type ENT) with listed fittings.Rigid polyvinyl chloride conduit (PVC) or reinforced thermosetting resin conduit (RTRC).Type MC cable or Type TC cable with listed fittings.Type MI cable terminated with listed fittings and installed and supported to avoid tensile stress.Cellular metal floor raceways only to supply ceiling outlets or as extensions to the area below the floor of a hazardous (classified) location. If cellular metal raceways are used, they shall not have connections leading into or passing through the hazardous (classified) location unless suitable seals are provided. [516.38(A)](https://2023.antflix.net#516.38(A)) | https://2023.antflix.net#516.38(A) |
Chaptewr 5 Special Occupancies | 516.38(B) | Equipment that is capable of producing arcs, sparks, or particles of hot metal, such as lamps and lampholders for fixed lighting, cutouts, switches, receptacles, motors, or other equipment having make-and-break or sliding contacts, where installed above a classified location or above a location where freshly finished goods are handled, shall be of the totally enclosed type or be constructed to prevent the escape of sparks or hot metal particles. [516.38(B)](https://2023.antflix.net#516.38(B)) | https://2023.antflix.net#516.38(B) |
Chaptewr 5 Special Occupancies | 516.40 | All persons and all electrically conductive objects, including any metal parts of the process equipment or apparatus, containers of material, exhaust ducts, and piping systems that convey flammable or combustible liquids, shall be electrically grounded. Provision shall be made to dissipate static electric charges from all nonconductive substrates in printing processes. Informational Note: See NFPA 77, Recommended Practice on Static Electricity, for information on reducing the risk of ignition from electrostatic discharges. [516.40](https://2023.antflix.net#516.40) | https://2023.antflix.net#516.40 |
Chaptewr 5 Special Occupancies | 517.1 | This article applies to electrical construction and installation criteria in health care facilities that provide services to human beings. The requirements of this article shall specify the installation criteria and wiring methods that minimize electrical hazards by the maintenance of adequately low potential differences only between exposed conductive surfaces that are likely to become energized and could be contacted by a patient. Informational Note No. 1: In a health care facility, it is difficult to prevent the occurrence of a conductive or capacitive path from the patient's body to some grounded object, because that path might be established accidentally or through instrumentation directly connected to the patient. Other electrically conductive surfaces that might make an additional contact with the patient, or instruments that might be connected to the patient, then become possible sources of electric currents that can traverse the patient's body. The hazard is increased as more apparatus is associated with the patient, therefore more intensive precautions are needed. Control of electric shock hazard requires the limitation of electric current that might flow in an electrical circuit involving the patient's body by raising the resistance of the conductive circuit that includes the patient, or by insulating exposed conductive surfaces that might become energized, in addition to reducing the potential difference that can appear between exposed conductive surfaces in the patient care vicinity, or by combinations of these methods. A special problem is presented by the patient with an externalized direct conductive path to the heart muscle. The patient could be electrocuted at current levels so low that additional protection in the design of appliances, insulation of the catheter, and control of medical practice is required. The requirements in Parts II and III not only apply to single-function buildings but are also intended to be individually applied to their respective forms of occupancy within a multifunction building [e.g., a doctor's examining room located within a limited care facility would be required to meet 517.10(A)]. Informational Note No. 2: For information concerning performance, maintenance, and testing criteria, refer to the appropriate health care facilities documents. Informational Note No. 3: Text that is followed by a reference in brackets has been extracted from NFPA 99-2021, Health Care Facilities Code, or NFPA 101-2021, Life Safety Code. Only editorial changes were made to the extracted text to make it consistent with this Code. [517.1](https://2023.antflix.net#517.1) | https://2023.antflix.net#517.1 |
Chaptewr 5 Special Occupancies | 517.6 | The reconditioning requirements of this Code shall not apply to patient care-related electrical equipment. Informational Note No. 1: Patient care-related electrical equipment is differentiated from electrical equipment as described in 110.21(A)(2). Informational Note No. 2: If patient care—related electrical equipment is relocated, it is expected to be recommissioned or recertified in accordance with the U.S. Federal Food, Drug, and Cosmetic Act (FDCA). [517.6](https://2023.antflix.net#517.6) | https://2023.antflix.net#517.6 |
Chaptewr 5 Special Occupancies | 517.10(A) | Part II shall apply to patient care space of all health care facilities. [517.10(A)](https://2023.antflix.net#517.10(A)) | https://2023.antflix.net#517.10(A) |
Chaptewr 5 Special Occupancies | 517.10(B) | Part II shall not apply to the following: Business offices, corridors, waiting rooms, and the like in clinics, medical and dental offices, and outpatient facilitiesSpaces of nursing homes and limited care facilities wired in accordance with Chapters 1 through 4 of this Code where these spaces are used exclusively as patient sleeping rooms, as determined by the health care facility's governing bodyInformational Note No. 1: See 406.12(5) for receptacles located in health care facility business offices, corridors, and waiting rooms that are required to be tamper resistant.Informational Note No. 2: See 210.12(D) for branch circuits supplying outlets and receptacles located in patient sleeping rooms in nursing homes and limited care facilities that are connected to arc-fault circuit-interrupter circuits.Areas used exclusively for any of the following purposes:Intramuscular injections (immunizations)Psychiatry and psychotherapyAlternative medicineOptometryPharmacy services not contiguous to health care facilitiesInformational Note No. 3: See NFPA 101-2021, Life Safety Code. [517.10(B)](https://2023.antflix.net#517.10(B)) | https://2023.antflix.net#517.10(B) |
Chaptewr 5 Special Occupancies | 517.12 | Except as modified in this article, wiring methods shall comply with Chapters 1 through 4 of this Code. [517.12](https://2023.antflix.net#517.12) | https://2023.antflix.net#517.12 |
Chaptewr 5 Special Occupancies | 517.13 | Wiring serving patient care spaces shall comply with the requirements of 517.13 (A) and (B). Exception: Luminaires more than 2.3 m (71/2 ft) above the floor and switches located outside of the patient care vicinity shall be permitted to be connected to an equipment grounding return path complying with the requirements of 517.13(A) or (B). [517.13](https://2023.antflix.net#517.13) | https://2023.antflix.net#517.13 |
Chaptewr 5 Special Occupancies | 517.13(A) | All branch circuits serving patient care spaces shall be provided with an effective ground-fault current path by installation in a metal raceway system or a cable having a metallic armor or sheath assembly. The metal raceway system, metallic cable armor, or sheath assembly shall itself qualify as an equipment grounding conductor in accordance with 250.118. [517.13(A)](https://2023.antflix.net#517.13(A)) | https://2023.antflix.net#517.13(A) |
Chaptewr 5 Special Occupancies | 517.13(B)(1) | An insulated copper equipment grounding conductor that is clearly identified along its entire length by green insulation and installed with the branch circuit conductors within the wiring method in accordance with 517.13(A) shall be connected to the following: Grounding terminals of all receptacles other than isolated ground receptaclesMetal outlet boxes, metal device boxes, or metal enclosuresNon-current-carrying conductive surfaces of fixed electrical equipment likely to become energized that are subject to personal contact, operating at over 100 voltsException No. 1: For other than isolated ground receptacles, an insulated equipment bonding jumper that directly connects to the equipment grounding conductor shall be permitted to connect the box and receptacle(s) to the equipment grounding conductor. Isolated ground receptacles shall be connected in accordance with 517.16.Exception No. 2: Metal faceplates shall be connected to an effective ground-fault current path by means of a metal mounting screw(s) securing the faceplate to a metal yoke or strap of a receptacle or to a metal outlet box. [517.13(B)(1)](https://2023.antflix.net#517.13(B)(1)) | https://2023.antflix.net#517.13(B)(1) |
Chaptewr 5 Special Occupancies | 517.13(B)(2) | Equipment grounding conductors and equipment bonding jumpers shall be sized in accordance with 250.122. [517.13(B)(2)](https://2023.antflix.net#517.13(B)(2)) | https://2023.antflix.net#517.13(B)(2) |
Chaptewr 5 Special Occupancies | 517.14 | The equipment grounding terminal buses of the normal and essential branch-circuit panelboards serving the same individual patient care vicinity shall be connected together with an insulated continuous copper conductor not smaller than 10 AWG. Where two or more panelboards serving the same individual patient care vicinity are served from separate transfer switches on the essential electrical system, the equipment grounding terminal buses of those panelboards shall be connected together with an insulated continuous copper conductor not smaller than 10 AWG. This conductor shall be permitted to be broken in order to terminate on the equipment grounding terminal bus in each panelboard. Exception: The insulated continuous copper conductor not smaller than 10 AWG shall be permitted to be terminated on listed connections to aluminum or copper busbars not smaller than 6 mm thick × 50 mm wide (1/4 in. thick × 2 in. wide) and of sufficient length to accommodate the number of terminations necessary for the bonding of the panelboards. The busbar shall be securely fastened and installed in an accessible location. [517.14](https://2023.antflix.net#517.14) | https://2023.antflix.net#517.14 |
Chaptewr 5 Special Occupancies | 517.16 | An isolated ground receptacle, if used, shall not defeat the purposes of the safety features of the grounding systems detailed in 517.13. [99:6.3.2.2.5(A)] [517.16](https://2023.antflix.net#517.16) | https://2023.antflix.net#517.16 |
Chaptewr 5 Special Occupancies | 517.16(A) | An isolated ground receptacle shall not be installed within a patient care vicinity. [99:6.3.2.2.5(B)] [517.16(A)](https://2023.antflix.net#517.16(A)) | https://2023.antflix.net#517.16(A) |
Chaptewr 5 Special Occupancies | 517.16(B) | Isolated ground receptacle(s) installed in patient care spaces outside of a patient care vicinity(s) shall comply with 517.16(B)(1) and (B)(2). [517.16(B)](https://2023.antflix.net#517.16(B)) | https://2023.antflix.net#517.16(B) |
Chaptewr 5 Special Occupancies | 517.16(B)(1) | The equipment grounding terminals of isolated ground receptacles installed in branch circuits for patient care spaces shall be connected to an insulated equipment grounding conductor in accordance with 250.146(D) installed in a wiring method described in 517.13(A). The equipment grounding conductor connected to the equipment grounding terminals of isolated ground receptacles in patient care spaces shall be clearly identified along the equipment grounding conductor's entire length by green insulation with one or more yellow stripes. [517.16(B)(1)](https://2023.antflix.net#517.16(B)(1)) | https://2023.antflix.net#517.16(B)(1) |
Chaptewr 5 Special Occupancies | 517.16(B)(2) | The insulated equipment grounding conductor required in 517.13(B)(1) shall be clearly identified along its entire length by green insulation, with no yellow stripes, and shall not be connected to the grounding terminals of isolated equipment ground receptacles but shall be connected to the box or enclosure indicated in 517.13(B)(1)(2) and to non—current-carrying conductive surfaces of fixed electrical equipment indicated in 517.13(B)(1)(3). Informational Note No. 1: This type of installation is typically used where a reduction of electrical noise (electromagnetic interference) is necessary, and parallel grounding paths are to be avoided. Informational Note No. 2: Care should be taken in specifying a system containing isolated ground receptacles, because the impedance of the effective ground-fault current path is dependent upon the equipment grounding conductor(s) and does not benefit from any conduit or building structure in parallel with the equipment grounding conductor. [517.16(B)(2)](https://2023.antflix.net#517.16(B)(2)) | https://2023.antflix.net#517.16(B)(2) |
Chaptewr 5 Special Occupancies | 517.17(A) | The requirements of 517.17 shall apply to buildings or portions of buildings containing health care facilities with Category 1 spaces or utilizing electrical life-support equipment, and buildings that provide the required essential utilities or services for the operation of Category 1 spaces or electrical life-support equipment. [517.17(A)](https://2023.antflix.net#517.17(A)) | https://2023.antflix.net#517.17(A) |
Chaptewr 5 Special Occupancies | 517.17(B) | Where ground-fault protection of equipment is provided for operation of the service disconnecting means or feeder disconnecting means as specified by 230.95 or 215.10, an additional step of ground-fault protection shall be provided in all next level feeder disconnecting means downstream toward the load. Such protection shall consist of overcurrent devices and current transformers or other protective equipment that shall cause the feeder disconnecting means to open. The additional levels of ground-fault protection of equipment shall not be installed on the load side of an essential electrical system transfer switch. [517.17(B)](https://2023.antflix.net#517.17(B)) | https://2023.antflix.net#517.17(B) |
Chaptewr 5 Special Occupancies | 517.17(C) | Ground-fault protection of equipment for operation of the service and feeder disconnecting means shall be fully selective such that the feeder device, but not the service device, shall open on ground faults on the load side of the feeder device. Separation of ground-fault protection time-current characteristics shall conform to manufacturer's recommendations and shall consider all required tolerances and disconnect operating time to achieve 100 percent selectivity. Informational Note: See 230.95, Informational Note, for transfer of alternate source where ground-fault protection is applied. [517.17(C)](https://2023.antflix.net#517.17(C)) | https://2023.antflix.net#517.17(C) |
Chaptewr 5 Special Occupancies | 517.17(D) | When ground-fault protection of equipment is first installed, each level shall be performance tested to ensure compliance with 517.17(C). This testing shall be conducted by a qualified person(s) using a test process in accordance with the instruction provided with the equipment. A written record of this testing shall be made and shall be available to the authority having jurisdiction. [517.17(D)](https://2023.antflix.net#517.17(D)) | https://2023.antflix.net#517.17(D) |
Chaptewr 5 Special Occupancies | 517.18(A) | Each patient bed location shall be supplied by at least two branch circuits, one from the critical branch and one from the normal system. All branch circuits from the normal system shall originate in the same panelboard. The electrical receptacles or the cover plate for the electrical receptacles supplied from the critical branch shall have a distinctive color or marking so as to be readily identifiable and shall also indicate the panelboard and branch-circuit number supplying them. Branch circuits serving patient bed locations shall not be part of a multiwire branch circuit. Exception No. 1: Branch circuits serving only special-purpose outlets or receptacles, such as portable X-ray outlets, shall not be required to be served from the same distribution panel or panels. Exception No. 2: The requirements of 517.18(A) shall not apply to patient bed locations in clinics, medical and dental offices, and outpatient facilities; psychiatric, substance abuse, and rehabilitation hospitals; sleeping rooms of nursing homes; and limited care facilities meeting the requirements of 517.10(B)(2). Exception No. 3: A Category 2 patient bed location served from two separate transfer switches on the critical branch shall not be required to have circuits from the normal system. Exception No. 4: Circuits served by Type 2 essential electrical systems shall be permitted to be fed by the equipment branch of the essential electrical system. [517.18(A)](https://2023.antflix.net#517.18(A)) | https://2023.antflix.net#517.18(A) |
Chaptewr 5 Special Occupancies | 517.18(B)(1) | Each patient bed location shall be provided with a minimum of eight receptacles. [517.18(B)(1)](https://2023.antflix.net#517.18(B)(1)) | https://2023.antflix.net#517.18(B)(1) |
Chaptewr 5 Special Occupancies | 517.18(B)(2) | The receptacles required in 517.18(B)(1) shall be permitted to be of the single, duplex, or quadruplex type or any combination of the three. All receptacles shall be listed "hospital grade" and shall be so identified. The grounding terminal of each receptacle shall be connected to an insulated copper equipment grounding conductor sized in accordance with Table 250.122. Exception No. 1: The requirements of 517.18(B)(1) and (B)(2) shall not apply to psychiatric, substance abuse, and rehabilitation hospitals meeting the requirements of 517.10(B)(2). Exception No. 2: Psychiatric security rooms shall not be required to have receptacle outlets installed in the room. Informational Note: It is not intended that there be a total, immediate replacement of existing non-hospital grade receptacles. It is intended, however, that non-hospital grade receptacles be replaced with hospital grade receptacles upon modification of use, renovation, or as existing receptacles need replacement. [517.18(B)(2)](https://2023.antflix.net#517.18(B)(2)) | https://2023.antflix.net#517.18(B)(2) |
Chaptewr 5 Special Occupancies | 517.18(C) | Receptacles that are located within patient rooms, bathrooms, playrooms, and activity rooms of pediatric units or spaces with similar risk as determined by the health care facility's governing body by conducting a risk assessment, other than infant nurseries, shall be listed and identified as "tamper resistant" or shall employ a listed tamper-resistant cover. [99:6.3.2.2.1 (D)] [517.18(C)](https://2023.antflix.net#517.18(C)) | https://2023.antflix.net#517.18(C) |
Chaptewr 5 Special Occupancies | 517.19(A) | Each patient bed location shall be supplied by at least two branch circuits, one or more from the critical branch and one or more from the normal system. At least one branch circuit from the critical branch shall supply an outlet(s) only at that bed location. The electrical receptacles or the cover plates for the electrical receptacles supplied from the life safety and critical branches shall have a distinctive color or marking so as to be readily identifiable. [99:6.7.2.2.5(B)] All branch circuits from the normal system shall be from a single panelboard. Critical branch receptacles shall be identified and shall also indicate the panelboard and circuit number supplying them. Branch circuits serving patient bed locations shall not be part of a multiwire branch circuit. Exception No. 1: Branch circuits serving only special-purpose receptacles or equipment in Category 1 spaces shall be permitted to be served by other panelboards. Exception No. 2: Category 1 spaces served from two separate critical branch transfer switches shall not be required to have circuits from the normal system. [517.19(A)](https://2023.antflix.net#517.19(A)) | https://2023.antflix.net#517.19(A) |
Chaptewr 5 Special Occupancies | 517.19(B)(1) | Each patient bed location shall be provided with a minimum of 14 receptacles, with at least one connected to either of the following: The normal system branch circuit required in 517.19(A)A critical branch circuit supplied by a different transfer switch than the other receptacles at the same patient bed location [517.19(B)(1)](https://2023.antflix.net#517.19(B)(1)) | https://2023.antflix.net#517.19(B)(1) |
Chaptewr 5 Special Occupancies | 517.19(B)(2) | The receptacles required in 517.19(B)(1) shall be permitted to be of the single, duplex, or quadruplex type or any combination of the three. All receptacles shall be listed "hospital grade" and shall be so identified. The grounding terminal of each receptacle shall be connected to the reference grounding point by means of an insulated copper equipment grounding conductor. [517.19(B)(2)](https://2023.antflix.net#517.19(B)(2)) | https://2023.antflix.net#517.19(B)(2) |
Chaptewr 5 Special Occupancies | 517.19(C)(1) | Each operating room shall be provided with a minimum of 36 receptacles divided between at least two branch circuits. At least 12 receptacles, but no more than 24, shall be connected to either of the following: The normal system branch circuit required in 517.19(A)A critical branch circuit supplied by a different transfer switch than the other receptacles at the same location [517.19(C)(1)](https://2023.antflix.net#517.19(C)(1)) | https://2023.antflix.net#517.19(C)(1) |
Chaptewr 5 Special Occupancies | 517.19(C)(2) | The receptacles shall be permitted to be of the locking or nonlocking type and of the single, duplex, or quadruplex types or any combination of the three. All nonlocking-type receptacles shall be listed hospital grade and so identified. The grounding terminal of each receptacle shall be connected to the reference grounding point by means of an insulated copper equipment grounding conductor. [517.19(C)(2)](https://2023.antflix.net#517.19(C)(2)) | https://2023.antflix.net#517.19(C)(2) |
Chaptewr 5 Special Occupancies | 517.19(D) | A patient care vicinity shall be permitted to have a patient equipment grounding point. The patient equipment grounding point, where supplied, shall be permitted to contain one or more listed grounding and bonding jacks. An equipment bonding jumper not smaller than 10 AWG shall be used to connect the grounding terminal of all grounding-type receptacles to the patient equipment grounding point. The bonding conductor shall be permitted to be arranged centrically or looped as convenient. Informational Note: Where there is no patient equipment grounding point, it is important that the distance between the reference grounding point and the patient care vicinity be as short as possible to minimize any potential differences. [517.19(D)](https://2023.antflix.net#517.19(D)) | https://2023.antflix.net#517.19(D) |
Chaptewr 5 Special Occupancies | 517.19(E) | Where a grounded electrical distribution system is used and metal feeder raceway or Type MC or MI cable that qualifies as an equipment grounding conductor in accordance with 250.118 is installed, grounding of enclosures and equipment, such as panelboards, switchboards, and switchgear, shall be ensured by one of the following bonding means at each termination or junction point of the metal raceway or Type MC or MI cable: A grounding bushing and a continuous copper bonding jumper, sized in accordance with 250.122, with the bonding jumper connected to the junction enclosure or the ground bus of the panelConnection of feeder raceways or Type MC or MI cable to threaded hubs or bosses on terminating enclosuresOther approved devices such as bonding-type locknuts or bushings. Standard locknuts shall not be used for bonding. [517.19(E)](https://2023.antflix.net#517.19(E)) | https://2023.antflix.net#517.19(E) |
Chaptewr 5 Special Occupancies | 517.19(F) | Isolated power systems shall be permitted to be used for Category 1 spaces, and, if used, the isolated power system equipment shall be listed as isolated power equipment. The isolated power system shall be designed and installed in accordance with 517.160. Exception: The audible and visual indicators of the line isolation monitor shall be permitted to be located at the nursing station for the area being served. [517.19(F)](https://2023.antflix.net#517.19(F)) | https://2023.antflix.net#517.19(F) |
Chaptewr 5 Special Occupancies | 517.19(G) | Where an isolated ungrounded power source is used and limits the first-fault current to a low magnitude, the equipment grounding conductor associated with the secondary circuit shall be permitted to be run outside of the enclosure of the power conductors in the same circuit. Informational Note: Although it is permitted to run the equipment grounding conductor outside of the conduit, it is safer to run it with the power conductors to provide better protection in case of a second ground fault. [517.19(G)](https://2023.antflix.net#517.19(G)) | https://2023.antflix.net#517.19(G) |
Chaptewr 5 Special Occupancies | 517.19(H) | The equipment grounding conductor for special-purpose receptacles, such as the operation of mobile X-ray equipment, shall be extended to the reference grounding points of branch circuits for all locations likely to be served from such receptacles. Where such a circuit is served from an isolated ungrounded system, the equipment grounding conductor shall not be required to be run with the power conductors; however, the equipment grounding terminal of the special-purpose receptacle shall be connected to the reference grounding point. [517.19(H)](https://2023.antflix.net#517.19(H)) | https://2023.antflix.net#517.19(H) |
Chaptewr 5 Special Occupancies | 517.20(A) | Wet procedure locations shall be provided with special protection against electric shock. [99:6.3.2.3.1] This special protection shall be provided by one of the following:Isolated power systems that remain in operation in the event of a single line-to-ground fault condition that inherently limits the possible ground-fault current due to a first fault to a low value, without interrupting the power supplyInformational Note No. 1: Isolated power systems can eliminate the danger of electric shock to patients who might be more susceptible to leakage current and unable to move in their beds.Power distribution system in which the power supply is interrupted if the ground-fault current does, in fact, exceed the trip value of a Class A GFCIInformational Note No. 2: See Annex E of ANSI/UL 943-2018, Ground-Fault Circuit-Interrupters, and 110.3(B) for the manufacturers' installation instructions of listed ground-fault circuit interrupters for information on the supply connection of life-support equipment to circuits providing ground-fault circuit-interrupter (GFCI) protection of personnel at outlets.[99:6.3.2.3.2]Exception: Branch circuits supplying only listed, fixed, therapeutic, and diagnostic equipment shall be permitted to be supplied from a grounded service, single- or 3-phase system if the following conditions are met:Wiring for grounded and isolated circuits does not occupy the same raceway.All conductive surfaces of the equipment are connected to an insulated copper equipment grounding conductor. [517.20(A)](https://2023.antflix.net#517.20(A)) | https://2023.antflix.net#517.20(A) |
Chaptewr 5 Special Occupancies | 517.20(B) | Where an isolated power system is utilized, the isolated power equipment shall be listed as isolated power equipment, and the isolated power system shall be designed and installed in accordance with 517.160. Informational Note: See Part IV of Article 680 for requirements on the installation of therapeutic pools and tubs. [517.20(B)](https://2023.antflix.net#517.20(B)) | https://2023.antflix.net#517.20(B) |
Chaptewr 5 Special Occupancies | 517.21 | Receptacles shall not be required in bathrooms or toilet rooms. [99:6.3.2.2.2(D)] Receptacles located in patient bathrooms and toilet rooms in Category 2 spaces shall have ground-fault circuit-interrupter protection in accordance with 210.8(B)(1). Ground-fault circuit-interrupter protection for personnel shall not be required for receptacles installed in those Category 2 and Category 1 spaces where a basin, sink, or other similar plumbing fixture is installed in the patient bed location. Informational Note: See ANSI/UL 943-2018, Ground-Fault Circuit-Interrupters, Annex E, and, in accordance with 110.3(B), the manufacturers' installation instructions of listed ground-fault circuit interrupters for information on the supply connection of life-support equipment to circuits providing ground-fault circuit-interrupter (GFCI) protection of personnel at outlets. [517.21](https://2023.antflix.net#517.21) | https://2023.antflix.net#517.21 |
Chaptewr 5 Special Occupancies | 517.22 | Demand factors for receptacle loads supplied by branch circuits not exceeding 150 volts to ground and installed in Category 1, Category 2, Category 3, and Category 4 patient care spaces shall be in accordance with 220.110. Informational Note: See Article 100 for the definitions of patient care space categories. [517.22](https://2023.antflix.net#517.22) | https://2023.antflix.net#517.22 |
Chaptewr 5 Special Occupancies | 517.25 | Type 1 and Type 2 essential electrical systems (EES) for health care facilities shall comprise separate branches capable of supplying a limited amount of lighting and power service, which is considered essential for life safety and orderly cessation of procedures during the time normal electrical service is interrupted for any reason. Informational Note: See NFPA 99-2021, Health Care Facilities Code, for information on essential electrical systems. [517.25](https://2023.antflix.net#517.25) | https://2023.antflix.net#517.25 |
Chaptewr 5 Special Occupancies | 517.26 | The life safety branch of the essential electrical system shall meet the requirements of Article 700, except as amended as follows: Section 700.4 shall not apply.Section 700.10(D) shall not apply.Section 700.17 shall be replaced with the following: Branch circuits that supply emergency lighting shall be installed to provide service from a source in accordance with 700.12 when normal supply for lighting is interrupted or where single circuits supply luminaires containing secondary batteries.Section 700.32 shall not apply.Informational Note No. 1: See NFPA 110-2019, Standard for Emergency and Standby Power Systems, for additional information.Informational Note No. 2: See 517.29 and NFPA 99-2021, Health Care Facilities Code, for additional information. [517.26](https://2023.antflix.net#517.26) | https://2023.antflix.net#517.26 |
Chaptewr 5 Special Occupancies | 517.29 | Informational Note: Type 1 essential electrical systems are comprised of three separate branches capable of supplying a limited amount of lighting and power service that is considered essential for life safety and effective facility operation during the time the normal electrical service is interrupted for any reason. These three separate branches are the life safety, critical, and equipment branches. [99:A.6.7.2.3] [517.29](https://2023.antflix.net#517.29) | https://2023.antflix.net#517.29 |
Chaptewr 5 Special Occupancies | 517.29(A) | The requirements of 517.29 through 517.35 shall apply to Type 1 essential electrical systems. Type 1 systems shall be required for Category 1 spaces. Type 1 systems shall be permitted to serve Category 2, Category 3, and Category 4 spaces. Informational Note No. 1: See NFPA 99-2021, Health Care Facilities Code, for performance, maintenance, and testing requirements of essential electrical systems in hospitals. See NFPA 20-2019, Standard for the Installation of Stationary Pumps for Fire Protection, for installation of centrifugal fire pumps. Informational Note No. 2: See NFPA 99-2021, Health Care Facilities Code, 6.7.5 and 6.7.6, for additional information on Type 1 and Type 2 essential electrical systems. [517.29(A)](https://2023.antflix.net#517.29(A)) | https://2023.antflix.net#517.29(A) |
Chaptewr 5 Special Occupancies | 517.29(B) | Category I spaces shall be served by a Type 1 essential electrical system. [99:6.4.1] Category 1 spaces shall not be served by a Type 2 EES. [99:6.4.2] [517.29(B)](https://2023.antflix.net#517.29(B)) | https://2023.antflix.net#517.29(B) |
Chaptewr 5 Special Occupancies | 517.30(A) | Essential electrical systems (EES) shall have two or more independent sources (or sets of sources). One on-site source (or sets of sources) shall be sized to supply the entire EES. The other independent source (or sets of sources) shall be sized to supply the entire EES and shall be permitted to be located on-site or off-site. Additional sources other than the first two independent sources shall be permitted to be sized to supply the intended load. Informational Note: An example of a set of sources may be several generators that combined serve the entire EES. [517.30(A)](https://2023.antflix.net#517.30(A)) | https://2023.antflix.net#517.30(A) |
Chaptewr 5 Special Occupancies | 517.30(B) | Power sources for the EES shall be permitted to be any of those specified in 517.30(B)(1) through (B)(5). [517.30(B)](https://2023.antflix.net#517.30(B)) | https://2023.antflix.net#517.30(B) |
Chaptewr 5 Special Occupancies | 517.30(B)(1) | Where utility power is used as the normal source, utility power shall not be used as the alternate source unless permitted elsewhere in this article. Informational Note: See 517.35 and 517.45 for essential system loads that can be supplied from dual sources of utility supply power. [517.30(B)(1)](https://2023.antflix.net#517.30(B)(1)) | https://2023.antflix.net#517.30(B)(1) |
Chaptewr 5 Special Occupancies | 517.30(B)(3) | Fuel cell systems shall be permitted to serve as the alternate power source for all or part of an EES. [99:6.7.1.5.1] Installation of fuel cells shall comply with the requirements in Parts I through VII of Article 692 for 1000 volts or less and Part VIII for over 1000 volts.N + 1 units shall be provided where N units have sufficient capacity to supply the demand load of the portion of the system served.Systems shall be able to assume loads within 10 seconds of loss of normal power source.Systems shall have a continuing source of fuel supply, together with sufficient on-site fuel storage for the essential system type.Where life safety and critical portions of the distribution system are present, a connection shall be provided for a portable diesel generator.Informational Note: See NFPA 853-2020, Standard for the Installation of Stationary Fuel Cell Power Systems, for information on installation of stationary fuel cells. [517.30(B)(3)](https://2023.antflix.net#517.30(B)(3)) | https://2023.antflix.net#517.30(B)(3) |
Chaptewr 5 Special Occupancies | 517.30(B)(4) | Energy storage systems shall be permitted to serve as the alternate source for all or part of an EES. Informational Note: See NFPA 111-2022, Standard on Stored Electrical Energy Emergency and Standby Power Systems, for information on the installation of energy storage systems. [517.30(B)(4)](https://2023.antflix.net#517.30(B)(4)) | https://2023.antflix.net#517.30(B)(4) |
Chaptewr 5 Special Occupancies | 517.30(B)(5) | EES shall be permitted to be supplied by a health care microgrid that also supplies nonessential loads. The health care microgrid shall be permitted to share distributed resources with the normal system. Health care microgrid systems shall be designed with sufficient reliability to provide effective facility operation consistent with the facility emergency operations plan. Health care microgrid system components shall not be compromised by failure of the normal source. Informational Note: See NFPA 99-2021, Health Care Facilities Code, for information on health care microgrids. [517.30(B)(5)](https://2023.antflix.net#517.30(B)(5)) | https://2023.antflix.net#517.30(B)(5) |
Chaptewr 5 Special Occupancies | 517.30(C) | EES components shall be located to minimize interruptions caused by natural forces common to the area (e.g., storms, floods, earthquakes, or hazards created by adjoining structures or activities). [99:6.2.4.1] [517.30(C)](https://2023.antflix.net#517.30(C)) | https://2023.antflix.net#517.30(C) |
Chaptewr 5 Special Occupancies | 517.30(C)(1) | Installation of electrical service distribution equipment shall be located to reduce possible interruption of normal electrical services resulting from natural or manmade causes as well as internal wiring and equipment failures. [517.30(C)(1)](https://2023.antflix.net#517.30(C)(1)) | https://2023.antflix.net#517.30(C)(1) |
Chaptewr 5 Special Occupancies | 517.30(C)(2) | Feeders shall be located to provide physical separation of the feeders of the alternate source and from the feeders of the normal electrical source to prevent possible simultaneous interruption. [99:6.2.4.3] Informational Note: Facilities in which the normal source of power is supplied by two or more separate central station-fed services experience greater than normal electrical service reliability than those with only a single feed. Such a dual source of normal power consists of two or more electrical services fed from separate generator sets or a utility distribution network that has multiple power input sources and is arranged to provide mechanical and electrical separation so that a fault between the facility and the generating sources is not likely to cause an interruption of more than one of the facility service feeders. [517.30(C)(2)](https://2023.antflix.net#517.30(C)(2)) | https://2023.antflix.net#517.30(C)(2) |
Chaptewr 5 Special Occupancies | 517.31(A) | Type 1 essential electrical systems shall be comprised of three separate branches capable of supplying a limited amount of lighting and power service that is considered essential for life safety and effective hospital operation during the time the normal electrical service is interrupted for any reason. The three branches are life safety, critical, and equipment. The division between the branches shall occur at transfer switches where more than one transfer switch is required. [99:6.7.2.3.1] [517.31(A)](https://2023.antflix.net#517.31(A)) | https://2023.antflix.net#517.31(A) |
Chaptewr 5 Special Occupancies | 517.31(B) | Transfer switches shall be in accordance with one of the following: The number of transfer switches to be used shall be based on reliability and design. Each branch of the essential electrical system shall have one or more transfer switches.One transfer switch shall be permitted to serve one or more branches in a facility with a continuous load on the switch of 150 kVA (120 kW) or less. [99:6.7.6.2.1.4]Informational Note No. 1: See NFPA 99-2021, Health Care Facilities Code, 6.7.3.1, 6.7.2.2.5, 6.7.2.2.5.15, and 6.7.2.2.7, for more information on transfer switches.Informational Note No. 2: See Informational Note Figure 517.31(B)(1).Informational Note Figure 517.31(B)(1) Type 1 Essential Electrical System - Minimum Requirement (Greater Than 150 kVA) for Transfer Switch Arrangement.Informational Note Figure 517.31(B)(2) Type 1 Essential Electrical System - Minimum Requirement (150 kVA or Less) for Transfer Switch Arrangement.Informational Note No. 3: See Informational Note Figure 517.31(B)(2). [517.31(B)](https://2023.antflix.net#517.31(B)) | https://2023.antflix.net#517.31(B) |
Chaptewr 5 Special Occupancies | 517.31(B)(1) | Loads served by the generating equipment not specifically named in this article shall be served by their own transfer switches such that the following conditions apply: These loads shall not be transferred if the transfer will overload the generating equipment.These loads shall be automatically shed upon generating equipment overloading. [517.31(B)(1)](https://2023.antflix.net#517.31(B)(1)) | https://2023.antflix.net#517.31(B)(1) |
Chaptewr 5 Special Occupancies | 517.31(B)(2) | Hospital power sources and alternate power sources shall be permitted to serve the essential electrical systems of contiguous or same-site facilities. [517.31(B)(2)](https://2023.antflix.net#517.31(B)(2)) | https://2023.antflix.net#517.31(B)(2) |
Chaptewr 5 Special Occupancies | 517.31(C)(1) | The life safety branch and critical branch [of the essential electrical system] shall be kept independent of all other wiring and equipment. [99:6.7.5.2.1] Raceways, cables, or enclosures of the life safety and critical branch shall be readily identified as components of the essential electrical system (EES). Boxes and enclosures (including transfer switches, generators, and power panels) shall be field- or factory-marked and identified as components of the EES. Raceways and cables shall be field- or factory-marked as components of the EES at intervals not to exceed 7.6 m (25 ft).Conductors of the life safety branch or critical branch shall not enter the same raceways, boxes, or cabinets with each other or any other wiring system. Branch conductors shall be permitted to occupy common equipment, raceways, boxes, or cabinets of other circuits not part of the life safety branch and critical branch where such wiring complies with one of the following:Is in transfer equipment enclosuresIs in exit or emergency luminaires supplied from two sourcesIs in a common junction box attached to exit or emergency luminaires supplied from two sourcesIs for two or more circuits supplied from the same branch and same transfer switchThe wiring of the equipment branch shall be permitted to occupy the same raceways, boxes, or cabinets of other circuits that are not part of the essential electrical system.Where Category 2 locations are served from two separate transfer switches on the essential electrical system in accordance with 517.18(A), Exception No. 3, the Category 2 circuits from the two separate systems shall be kept independent of each other.Where Category 1 locations are served from two separate transfer switches on the essential electrical system in accordance with 517.19(A), Exception No. 2, the critical care circuits from the two separate systems shall be kept independent of each other. [517.31(C)(1)](https://2023.antflix.net#517.31(C)(1)) | https://2023.antflix.net#517.31(C)(1) |
Chaptewr 5 Special Occupancies | 517.31(C)(2) | Where isolated power systems are installed in any of the areas in 517.34(A)(1) and (A)(2), each system shall be supplied by an individual circuit serving no other load. [517.31(C)(2)](https://2023.antflix.net#517.31(C)(2)) | https://2023.antflix.net#517.31(C)(2) |
Chaptewr 5 Special Occupancies | 517.31(C)(3) | The wiring of the life safety and critical branches shall be mechanically protected by raceways. Where installed as branch circuits in patient care spaces, the installation shall comply with the requirements of 517.13(A) and (B) and 250.118. Only the following wiring methods shall be permitted:Nonflexible metal raceways, Type MI cable, RTRC marked with the suffix —XW, or Schedule 80 PVC conduit. Nonmetallic raceways shall not be used for branch circuits that supply patient care spaces.Where encased in not less than 50 mm (2 in.) of concrete, Schedule 40 PVC conduit, flexible nonmetallic or jacketed metallic raceways, or jacketed metallic cable assemblies listed for installation in concrete. Nonmetallic raceways shall not be used for branch circuits that supply patient care spaces.Listed flexible metal raceways and listed metal sheathed cable assemblies, as follows:Where used in listed prefabricated medical headwallsIn listed office furnishingsWhere fished into existing walls or ceilings, not otherwise accessible and not subject to physical damageWhere necessary for flexible connection to equipmentFor equipment that requires a flexible connection due to movement, vibration, or operationLuminaires installed in ceiling structuresFlexible power cords of appliances or other utilization equipment connected to the essential electrical system.Cables for Class 2 or Class 3 systems permitted in Part VI of this article, with or without raceways.Informational Note: See 517.13 for additional grounding requirements in patient care areas. [517.31(C)(3)](https://2023.antflix.net#517.31(C)(3)) | https://2023.antflix.net#517.31(C)(3) |
Chaptewr 5 Special Occupancies | 517.31(D) | The essential electrical system shall have the capacity and rating to meet the maximum actual demand likely to be produced by the connected load. Feeders shall be sized in accordance with 215.2 and Part III of Article 220. The alternate power source(s) required in 517.30 shall have the capacity and rating to meet the demand produced by the load at any given time. Demand calculations for sizing of the alternate power source(s) shall be based on any of the following:Prudent demand factors and historical dataConnected loadFeeder calculationsAny combination of the aboveThe sizing requirements in 700.4 and 701.4 shall not apply to alternate sources. [517.31(D)](https://2023.antflix.net#517.31(D)) | https://2023.antflix.net#517.31(D) |
Chaptewr 5 Special Occupancies | 517.31(E) | The electrical receptacles or the cover plates for the electrical receptacles supplied from the life safety and critical branches shall have a distinctive color or marking so as to be readily identifiable. [99:6.7.2.2.5(B)] [517.31(E)](https://2023.antflix.net#517.31(E)) | https://2023.antflix.net#517.31(E) |
Chaptewr 5 Special Occupancies | 517.31(F) | A single feeder supplied by a local or remote alternate power source shall be permitted to supply the essential electrical system to the point at which the life safety, critical, and equipment branches are separated. Installation of the transfer equipment shall be permitted at other than the location of the alternate power source. [517.31(F)](https://2023.antflix.net#517.31(F)) | https://2023.antflix.net#517.31(F) |
Chaptewr 5 Special Occupancies | 517.31(G) | Overcurrent protective devices serving the essential electrical system shall be coordinated for the period of time that a fault's duration extends beyond 0.1 second. Exception No. 1: Coordination shall not be required between transformer primary and secondary overcurrent protective devices where only one overcurrent protective device or set of overcurrent protective devices exists on the transformer secondary. Exception No. 2: Coordination shall not be required between overcurrent protective devices of the same size (ampere rating) in series. Informational Note No. 1: The terms coordination and coordinated as used in this section do not cover the full range of overcurrent conditions. Informational Note No. 2: See 517.17(C) for information on requirements for the coordination of ground-fault protection. [517.31(G)](https://2023.antflix.net#517.31(G)) | https://2023.antflix.net#517.31(G) |
Chaptewr 5 Special Occupancies | 517.32(A) | Those functions of patient care depending on lighting or appliances that are connected to the essential electrical system shall be divided into the life safety branch and the critical branch, as described in 517.33 and 517.34. [517.32(A)](https://2023.antflix.net#517.32(A)) | https://2023.antflix.net#517.32(A) |
Chaptewr 5 Special Occupancies | 517.32(B) | The life safety and critical branches shall be installed and connected to the alternate power source specified in 517.41(A) and (B) so that all functions specified herein for the life safety and critical branches are automatically restored to operation within 10 seconds after interruption of the normal source. [99:6.7.5.3.1] [517.32(B)](https://2023.antflix.net#517.32(B)) | https://2023.antflix.net#517.32(B) |
Chaptewr 5 Special Occupancies | 517.33 | The life safety branch shall be limited to circuits essential to life safety. [99:6.7.5.1.2.3] No functions other than those listed in 517.33(A) through (H) shall be connected to the life safety branch. The life safety branch shall supply power as follows: [517.33](https://2023.antflix.net#517.33) | https://2023.antflix.net#517.33 |
Chaptewr 5 Special Occupancies | 517.33(A) | Illumination of means of egress such as lighting required for corridors, passageways, stairways, and landings at exit doors, and all necessary ways of approach to exits. Switching arrangements to transfer patient corridor lighting in hospitals from general illumination circuits to night illumination circuits shall be permitted, if only one of two circuits can be selected and both circuits cannot be extinguished at the same time. Informational Note: See NFPA 101-2021, Life Safety Code, Sections 7.8 and 7.9. [517.33(A)](https://2023.antflix.net#517.33(A)) | https://2023.antflix.net#517.33(A) |
Chaptewr 5 Special Occupancies | 517.33(B) | Exit signs and exit directional signs. Informational Note: See NFPA 101-2021, Life Safety Code, Section 7.10. [517.33(B)](https://2023.antflix.net#517.33(B)) | https://2023.antflix.net#517.33(B) |
Chaptewr 5 Special Occupancies | 517.33(C) | Alarm and alerting systems including the following: Fire alarm systemsAlarm and alerting systems (other than fire alarm systems) shall be connected to the life safety branch or critical branch. [99:6.7.5.1.2.5]Alarms for systems used for the piping of nonflammable medical gasesMechanical, control, and other accessories required for effective life safety systems operation shall be permitted to be connected to the life safety branch. [517.33(C)](https://2023.antflix.net#517.33(C)) | https://2023.antflix.net#517.33(C) |
Chaptewr 5 Special Occupancies | 517.33(D) | Hospital communications systems, where used for issuing instructions during emergency conditions. [99:6.7.5.1.2.4(3)] [517.33(D)](https://2023.antflix.net#517.33(D)) | https://2023.antflix.net#517.33(D) |
Chaptewr 5 Special Occupancies | 517.33(E) | Generator set locations as follows: Task illuminationBattery charger for emergency battery-powered lighting unit(s)Select receptacles at the generator set location and essential electrical system transfer switch locations [99:6.7.5.1.2.4(4)] [517.33(E)](https://2023.antflix.net#517.33(E)) | https://2023.antflix.net#517.33(E) |
Chaptewr 5 Special Occupancies | 517.33(F) | Loads dedicated to a specific generator, including the fuel transfer pump(s), ventilation fans, electrically operated louvers, controls, cooling system, and other generator accessories essential for generator operation, shall be connected to the life safety branch or to the output terminals of the generator with overcurrent protective devices. [99:6.7.5.1.2.6] [517.33(F)](https://2023.antflix.net#517.33(F)) | https://2023.antflix.net#517.33(F) |
Chaptewr 5 Special Occupancies | 517.33(G) | Elevator cab lighting, control, communications, and signal systems. [99:6.7.5.1.2.4(5)] [517.33(G)](https://2023.antflix.net#517.33(G)) | https://2023.antflix.net#517.33(G) |
Chaptewr 5 Special Occupancies | 517.33(H) | Electrically powered doors used for building egress. [99:6.7.5.1.2.4(6)] [517.33(H)](https://2023.antflix.net#517.33(H)) | https://2023.antflix.net#517.33(H) |
Chaptewr 5 Special Occupancies | 517.34(A) | The critical branch shall supply power for task illumination, fixed equipment, select receptacles, and select power circuits serving the following spaces and functions related to patient care: Category 1 spaces where deep sedation or general anesthesia is administered, task illumination, select receptacles, and fixed equipmentTask illumination and select receptacles in the following:Patient care spaces, including infant nurseries, selected acute nursing areas, psychiatric bed areas (omit receptacles), and ward treatment roomsMedication preparation spacesPharmacy dispensing spacesNurses' stations - unless adequately lighted by corridor luminairesAdditional specialized patient care task illumination and receptacles, where neededNurse call systemsBlood, bone, and tissue banksTelecommunications entrance facility, telecommunications equipment rooms, and telecommunication rooms and equipment in these roomsTask illumination, select receptacles, and select power circuits for the following areas:Category 1 or 2 spaces with at least one duplex receptacle per patient bed location, and task illumination as required by the governing body of the health care facilityAngiographic labsCardiac catheterization labsCoronary care unitsHemodialysis rooms or areasEmergency room treatment areas (select)Human physiology labsIntensive care unitsPostoperative recovery rooms (select)Clinical IT-network equipmentWireless phone and paging equipment for clinical staff communicationsAdditional task illumination, receptacles, and select power circuits needed for effective facility operation, including single-phase fractional horsepower motors, which are permitted to be connected to the critical branch[99:6.7.5.1.3.2] [517.34(A)](https://2023.antflix.net#517.34(A)) | https://2023.antflix.net#517.34(A) |
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