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Chaptewr 5 Special Occupancies | 500.7(D) | This protection technique shall be permitted for equipment in any hazardous (classified) location for which it is identified. [500.7(D)](https://2023.antflix.net#500.7(D)) | https://2023.antflix.net#500.7(D) |
Chaptewr 5 Special Occupancies | 500.7(E) | This protection technique shall be permitted for equipment in Class I, Division 1 or Division 2; Class II, Division 1 or Division 2; or Class III, Division 1 or Division 2 locations. [500.7(E)](https://2023.antflix.net#500.7(E)) | https://2023.antflix.net#500.7(E) |
Chaptewr 5 Special Occupancies | 500.7(F) | This protection technique shall be permitted for equipment in Class I, Division 2; Class II, Division 2; or Class III, Division 1 or 2 locations. [500.7(F)](https://2023.antflix.net#500.7(F)) | https://2023.antflix.net#500.7(F) |
Chaptewr 5 Special Occupancies | 500.7(G) | This protection technique shall be permitted for equipment in Class I. Division 2; Class II, Division 2; or Class III, Division 1 or 2 locations. [500.7(G)](https://2023.antflix.net#500.7(G)) | https://2023.antflix.net#500.7(G) |
Chaptewr 5 Special Occupancies | 500.7(H) | This protection technique shall be permitted for equipment in Class I, Division 2; Class II, Division 2; or Class III, Division 1 or 2 locations. [500.7(H)](https://2023.antflix.net#500.7(H)) | https://2023.antflix.net#500.7(H) |
Chaptewr 5 Special Occupancies | 500.7(I) | This protection technique shall be permitted for current-interrupting contacts in Class I, Division 2 locations as described in 501.115(B)(1)(2). [500.7(I)](https://2023.antflix.net#500.7(I)) | https://2023.antflix.net#500.7(I) |
Chaptewr 5 Special Occupancies | 500.7(J) | This protection technique shall be permitted for equipment in Class I, Division 2; Class II, Division 2; or Class III, Division 1 or 2 locations. [500.7(J)](https://2023.antflix.net#500.7(J)) | https://2023.antflix.net#500.7(J) |
Chaptewr 5 Special Occupancies | 500.7(K) | A detection system for flammable gases shall be permitted as a means of protection in restricted industrial establishments. [500.7(K)](https://2023.antflix.net#500.7(K)) | https://2023.antflix.net#500.7(K) |
Chaptewr 5 Special Occupancies | 500.7(K)(1) | Any gas detection system used as a protection technique shall meet all of the requirements in 500.7(K)(1)(a) through (K)(1)(e). The gas detection equipment used shall be listed for Class I, Division 1 and listed for the detection of the specific gas or vapor to be encountered.The gas detection system shall not use port... | https://2023.antflix.net#500.7(K)(1) |
Chaptewr 5 Special Occupancies | 500.7(K)(2) | A location, enclosed space, or building that is classified as a Class I, Division 1 location due to inadequate ventilation and is provided with a detection system for flammable gases shall be permitted to use electrical equipment, installation methods, and wiring practices suitable for Class I, Division 2 installations... | https://2023.antflix.net#500.7(K)(2) |
Chaptewr 5 Special Occupancies | 500.7(K)(3) | Any building or enclosed space that does not contain a source of flammable gases or vapors that is located in, or has an opening into, a Class I, Division 2 hazardous (classified) location and is provided with a detection system for flammable gases shall be permitted to use electrical equipment, installation methods, a... | https://2023.antflix.net#500.7(K)(3) |
Chaptewr 5 Special Occupancies | 500.7(K)(4) | Inside the interior of a control panel containing instrumentation or other equipment using or measuring flammable liquids, gases, or vapors which is provided with a detection system for flammable gases shall be permitted to use electrical equipment, installation methods, and wiring practices suitable for Class I, Divis... | https://2023.antflix.net#500.7(K)(4) |
Chaptewr 5 Special Occupancies | 500.7(L) | This protection technique shall be permitted for equipment in Class I or II, Division 1 or 2 locations for which the equipment is identified. Informational Note: The identified class and division depends on the intended explosive atmosphere and the number of faults applied as part of the protection technique evaluation... | https://2023.antflix.net#500.7(L) |
Chaptewr 5 Special Occupancies | 500.7(M) | This protection technique shall be permitted for equipment in Class I or II, Division 2 locations for which the equipment is identified. Informational Note: The identified class and division depends on the intended explosive atmosphere as part of the protection technique evaluation. [500.7(M)](https://2023.antflix.net#... | https://2023.antflix.net#500.7(M) |
Chaptewr 5 Special Occupancies | 500.7(N) | This protection technique shall be permitted for equipment in Class I or II, Division 1 or 2 locations for which the equipment is identified. Informational Note: The identified class and division depends on the intended explosive atmosphere and the number of faults applied as part of the protection technique evaluation... | https://2023.antflix.net#500.7(N) |
Chaptewr 5 Special Occupancies | 500.7(O) | This protection technique shall be permitted for skin effect trace heating equipment in Class I, Division 2; Class II, Division 2; or Class III, Division 2 locations for which it is listed. [500.7(O)](https://2023.antflix.net#500.7(O)) | https://2023.antflix.net#500.7(O) |
Chaptewr 5 Special Occupancies | 500.7(P) | This protection technique shall be permitted for electrical resistance trace heating equipment in Class I, Division 1; Class I, Division 2; Class II, Division 1; Class II, Division 2; Class III, Division 1; or Class III, Division 2 locations for which it is listed. [500.7(P)](https://2023.antflix.net#500.7(P)) | https://2023.antflix.net#500.7(P) |
Chaptewr 5 Special Occupancies | 500.7(Q) | This protection technique shall be permitted for impedance heating equipment in Class I, Division 2; Class II, Division 2; or Class III, Division 2 locations for which it is listed. [500.7(Q)](https://2023.antflix.net#500.7(Q)) | https://2023.antflix.net#500.7(Q) |
Chaptewr 5 Special Occupancies | 500.7(R) | This protection technique shall be permitted for equipment in Class I, Division 2 locations. [500.7(R)](https://2023.antflix.net#500.7(R)) | https://2023.antflix.net#500.7(R) |
Chaptewr 5 Special Occupancies | 500.7(S) | This protection technique shall be permitted for equipment in Class I, Division 2 locations. [500.7(S)](https://2023.antflix.net#500.7(S)) | https://2023.antflix.net#500.7(S) |
Chaptewr 5 Special Occupancies | 500.7(T) | This protection technique shall be permitted for equipment in Class I, Division 2; Class II, Division 2; Class III, Division 1; or Class III, Division 2 locations. [500.7(T)](https://2023.antflix.net#500.7(T)) | https://2023.antflix.net#500.7(T) |
Chaptewr 5 Special Occupancies | 500.7(U) | Protection techniques not specified in 500.7(A) through (T) shall be permitted for use in equipment listed for use in hazardous (classified) locations. Informational Note: See ANSI/UL 60079-33, Explosive Atmospheres - Part 33: Equipment Protection by Special Protection "s", for additional information. [500.7(U)](https:... | https://2023.antflix.net#500.7(U) |
Chaptewr 5 Special Occupancies | 500.8 | Explosionproof or dust-ignitionproof equipment shall not be permitted for use at temperatures lower than -25°C (-13°F) unless they are identified for low-temperature service. Informational Note: At low ambient temperatures, flammable concentrations of vapors might not exist in a location classified as Class I, Division... | https://2023.antflix.net#500.8 |
Chaptewr 5 Special Occupancies | 500.8(A) | Suitability of identified equipment shall be determined by one of the following: Equipment listing or labelingEvidence of equipment evaluation from a qualified testing laboratory or inspection agency concerned with product evaluationEvidence acceptable to the authority having jurisdiction such as a manufacturer's self-... | https://2023.antflix.net#500.8(A) |
Chaptewr 5 Special Occupancies | 500.8(B)(1) | Equipment shall be identified not only for the class of location but also for the explosive, combustible, or ignitible properties of the specific gas, vapor, dust, or fibers/flyings that will be present. In addition, Class I equipment shall not have any exposed surface that operates at a temperature in excess of the au... | https://2023.antflix.net#500.8(B)(1) |
Chaptewr 5 Special Occupancies | 500.8(B)(2) | Equipment identified for a Division 1 location shall be permitted in a Division 2 location of the same class, group, and temperature class and shall comply with the requirements of 500.8(B)(2)(a) or (B)(2)(b) as applicable. Intrinsically safe apparatus having a control drawing requiring the installation of associated a... | https://2023.antflix.net#500.8(B)(2) |
Chaptewr 5 Special Occupancies | 500.8(B)(3) | Where specifically permitted in Part III of Articles 501, 502, and 503, general-purpose equipment or equipment in general-purpose enclosures shall be permitted to be installed in Division 2 locations if the equipment does not constitute a source of ignition under normal operating conditions. [500.8(B)(3)](https://2023.... | https://2023.antflix.net#500.8(B)(3) |
Chaptewr 5 Special Occupancies | 500.8(B)(4) | Equipment that depends on a single compression seal, diaphragm, or tube to prevent flammable or combustible fluids from entering the equipment shall be identified for a Class I, Division 2 location even if installed in an unclassified location. Equipment installed in a Class I, Division 1 location shall be identified f... | https://2023.antflix.net#500.8(B)(4) |
Chaptewr 5 Special Occupancies | 500.8(B)(5) | Unless otherwise specified, normal operating conditions for motors shall be assumed to be rated full-load steady conditions. [500.8(B)(5)](https://2023.antflix.net#500.8(B)(5)) | https://2023.antflix.net#500.8(B)(5) |
Chaptewr 5 Special Occupancies | 500.8(B)(6) | Where flammable gases, flammable liquid—produced vapors, or combustible liquid-produced vapors and combustible dusts are or might be present at the same time, the simultaneous presence of the specific materials shall be considered when determining the safe operating temperature of the electrical equipment. [500.8(B)(6)... | https://2023.antflix.net#500.8(B)(6) |
Chaptewr 5 Special Occupancies | 500.8(C) | Equipment shall be marked to show the environment for which it has been evaluated. Unless otherwise specified or allowed in 500.8(C)(6), the marking shall include the information specified in 500.8(C)(1) through (C)(5). [500.8(C)](https://2023.antflix.net#500.8(C)) | https://2023.antflix.net#500.8(C) |
Chaptewr 5 Special Occupancies | 500.8(C)(1) | The marking shall specify the class(es) for which the equipment is suitable. [500.8(C)(1)](https://2023.antflix.net#500.8(C)(1)) | https://2023.antflix.net#500.8(C)(1) |
Chaptewr 5 Special Occupancies | 500.8(C)(2) | The marking shall specify the division if the equipment is suitable for Division 2 only. Equipment suitable for Division 1 shall be permitted to omit the division marking. Informational Note: See 500.8(B)(2). Equipment not marked to indicate a division, or marked "Division 1" or "Div. 1," is suitable for both Division ... | https://2023.antflix.net#500.8(C)(2) |
Chaptewr 5 Special Occupancies | 500.8(C)(3) | The marking shall specify the applicable material classification group(s) or specific gas, vapor, dust, or fiber/flying in accordance with 500.6. Exception: Fixed luminaires marked for use only in Class I, Division 2 or Class II, Division 2 locations shall not be required to indicate the group. Informational Note: A sp... | https://2023.antflix.net#500.8(C)(3) |
Chaptewr 5 Special Occupancies | 500.8(C)(4) | The marking shall specify the temperature class or operating temperature at a 40°C ambient temperature, or at the higher ambient temperature if the equipment is rated and marked for an ambient temperature of greater than 40°C. For equipment installed in a Class II, Division 1 location, the temperature class or operatin... | https://2023.antflix.net#500.8(C)(4) |
Chaptewr 5 Special Occupancies | 500.8(C)(5) | Electrical equipment designed for use in the ambient temperature range between —25°C to +40°C shall require no ambient temperature marking. For equipment rated for a temperature range other than —25°C to +40°C, the marking shall specify the special range of ambient temperatures in degrees Celsius. The marking shall inc... | https://2023.antflix.net#500.8(C)(5) |
Chaptewr 5 Special Occupancies | 500.8(C)(6) | General-Purpose Equipment. Fixed general-purpose equipment in Class I locations, other than fixed luminaires, that is acceptable for use in Class I, Division 2 locations shall not be required to be marked with the class, division, group, temperature class, or ambient temperature range.Dusttight Equipment, Fixed dusttig... | https://2023.antflix.net#500.8(C)(6) |
Chaptewr 5 Special Occupancies | 500.8(D)(1) | The temperature marking specified in 500.8(C) shall not exceed the autoignition temperature of the specific gas or vapor to be encountered. Informational Note: See NFPA 497, Recommended Practice for the Classification of Flammable Liquids, Gases, or Vapors and of Hazardous (Classified) Locations for Electrical Installa... | https://2023.antflix.net#500.8(D)(1) |
Chaptewr 5 Special Occupancies | 500.8(D)(2) | The temperature marking specified in 500.8(C) shall be less than the ignition temperature of the specific dust or metal fiber/flying to be encountered. For organic dusts that might dehydrate or carbonize, the temperature marking shall not exceed the lower of either the ignition temperature or 165°C (329°F). Information... | https://2023.antflix.net#500.8(D)(2) |
Chaptewr 5 Special Occupancies | 500.8(D)(3) | The temperature marking specified in 500.8(C) shall be less than the ignition temperature of the specific fiber/flying to be encountered, except as specified in 500.8(D)(3)(a) or (D)(3)(b). For nonmetal combustible fibers/flyings that might dehydrate or carbonize, the temperature marking shall not exceed the lower of e... | https://2023.antflix.net#500.8(D)(3) |
Chaptewr 5 Special Occupancies | 500.8(E) | The supply connection entry thread form shall be NPT or metric. Conduit and fittings shall be made wrench-tight to prevent sparking when fault current flows through the conduit system, and to ensure the explosionproof integrity of the conduit system where applicable. Equipment provided with threaded entries for field w... | https://2023.antflix.net#500.8(E) |
Chaptewr 5 Special Occupancies | 500.8(E)(1) | For equipment provided with threaded entries for NPT-threaded conduit or fittings, listed conduit, listed conduit fittings, or listed cable fittings shall be used. All NPT-threaded conduit and fittings shall be threaded with a National (American) Standard Pipe Taper (NPT) thread. NPT-threaded entries into explosionproo... | https://2023.antflix.net#500.8(E)(1) |
Chaptewr 5 Special Occupancies | 500.8(E)(2) | For equipment with metric-threaded entries, listed conduit fittings or listed cable fittings shall be used. Such entries shall be identified as being metric, or listed adapters to permit connection to conduit or NPT-threaded fittings shall be provided with the equipment and shall be used for connection to conduit or NP... | https://2023.antflix.net#500.8(E)(2) |
Chaptewr 5 Special Occupancies | 500.8(E)(3) | All unused openings shall be closed with blanking elements or close-up plugs that are listed for the location. The thread engagement shall comply with the requirements of 500.8(E)(1) or (E)(2). [500.8(E)(3)](https://2023.antflix.net#500.8(E)(3)) | https://2023.antflix.net#500.8(E)(3) |
Chaptewr 5 Special Occupancies | 500.8(F) | An optical fiber cable, with or without current-carrying conductors (hybrid optical fiber cable), shall be installed to address the associated fire hazard and sealed to address the associated explosion hazard in accordance with Part II of Articles 501, 502, or 503, as applicable. [500.8(F)](https://2023.antflix.net#500... | https://2023.antflix.net#500.8(F) |
Chaptewr 5 Special Occupancies | 500.8(G) | The risk of ignition from optical radiation shall be evaluated for laser equipment, optical fiber equipment, and any other convergent light sources or beams where light is focused in one single point within a hazardous area with a wavelength range of 380 nm to 10 pm. This requirement shall include optical equipment tha... | https://2023.antflix.net#500.8(G) |
Chaptewr 5 Special Occupancies | 501.1 | This article covers the requirements for electrical and electronic equipment and wiring for all voltages in Class I, Division 1 and Division 2 locations where flammable gases, flammable liquid—produced vapors, or combustible liquid—produced vapors are or might be present in the air in quantities sufficient to produce e... | https://2023.antflix.net#501.1 |
Chaptewr 5 Special Occupancies | 501.5 | Equipment listed and marked in accordance with 505.9(C)(2) for use in Zone 0, 1, or 2 locations shall be permitted in Class I, Division 2 locations for the same gas and with a suitable temperature class. Equipment listed and marked in accordance with 505.9(C)(2) for use in Zone 0 locations shall be permitted in Class I... | https://2023.antflix.net#501.5 |
Chaptewr 5 Special Occupancies | 501.10 | Wiring methods shall comply with 501.10(A) or (B). [501.10](https://2023.antflix.net#501.10) | https://2023.antflix.net#501.10 |
Chaptewr 5 Special Occupancies | 501.10(A)(1) | In Class I, Division 1 locations, the following wiring methods shall be permitted: Informational Note No. 1: See Article 100 for the definition of restricted industrial establishment [as applied to hazardous (classified) locations].Threaded rigid metal conduit (RMC) or threaded intermediate metal conduit (IMC), includi... | https://2023.antflix.net#501.10(A)(1) |
Chaptewr 5 Special Occupancies | 501.10(A)(2) | If flexibility is necessary to minimize the transmission of vibration from equipment during operation or to allow for movement after installation during maintenance, one of the following shall be permitted: Flexible fittings listed for the location.Flexible cord in accordance with 501.140, terminated with cord connecto... | https://2023.antflix.net#501.10(A)(2) |
Chaptewr 5 Special Occupancies | 501.10(A)(3) | All boxes and fittings shall be identified for Class I, Division 1. Informational Note No. 1: See ANSI/UL 2225, Cables and Cable-Fittings for Use in Hazardous (Classified) Locations, for information on construction, testing, and marking of cables, explosionproof cable fittings, and explosionproof cord connectors for en... | https://2023.antflix.net#501.10(A)(3) |
Chaptewr 5 Special Occupancies | 501.10(B)(1) | In Class I, Division 2 locations, all wiring methods in accordance with 501.10(A) and the following wiring methods shall be permitted: Informational Note No. 1: See Article 100 for the definition of restricted industrial establishment [as applied to hazardous (classified) locations].Rigid metal conduit (RMC) or interme... | https://2023.antflix.net#501.10(B)(1) |
Chaptewr 5 Special Occupancies | 501.10(B)(2) | If flexibility is necessary to minimize the transmission of vibration from equipment during operation or to allow for movement after installation during maintenance, one or more of the following shall be permitted: Listed flexible metal fittingsFlexible metal conduit with listed fittings and bonded in accordance with 5... | https://2023.antflix.net#501.10(B)(2) |
Chaptewr 5 Special Occupancies | 501.10(B)(3) | Nonincendive field wiring shall be permitted using any of the wiring methods permitted for unclassified locations. Nonincendive field wiring systems shall be installed in accordance with the control drawing(s). Simple apparatus, not shown on the control drawing, shall be permitted in a nonincendive field wiring circuit... | https://2023.antflix.net#501.10(B)(3) |
Chaptewr 5 Special Occupancies | 501.10(B)(4) | Boxes and fittings shall be explosion-proof if required by 501.105(B)(2), 501.115(B)(1), or 501.150(B)(1). Informational Note No. 1: See ANSI/UL 2225, Cables and Cable-Fittings for Use in Hazardous (Classified) Locations, for information on construction, testing, and marking of cable for entry into enclosures required ... | https://2023.antflix.net#501.10(B)(4) |
Chaptewr 5 Special Occupancies | 501.15 | Seals in conduit and cable systems shall comply with 501.15(A) through (F). Sealing compound shall be used in Type MI cable termination fittings to exclude moisture and other fluids from the cable insulation. Informational Note No. 1: Seals are provided in conduit and cable systems to minimize the passage of gases and ... | https://2023.antflix.net#501.15 |
Chaptewr 5 Special Occupancies | 501.15(A) | In Class I, Division 1 locations, conduit seals shall be located in accordance with 501.15(A)(1) through (A)(4). [501.15(A)](https://2023.antflix.net#501.15(A)) | https://2023.antflix.net#501.15(A) |
Chaptewr 5 Special Occupancies | 501.15(A)(1) | Each conduit entry into an explosionproof enclosure shall have a conduit seal where either of the following conditions apply: The enclosure contains apparatus, such as switches, circuit breakers, fuses, relays, or resistors that may produce arcs, sparks, or temperatures that exceed 80 percent of the autoignition temper... | https://2023.antflix.net#501.15(A)(1) |
Chaptewr 5 Special Occupancies | 501.15(A)(2) | Conduit seals shall be installed within 450 mm (18 in.) of the enclosure in each conduit entry into a pressurized enclosure where the conduit is not pressurized as part of the protection system. Informational Note No. 1: Installing the seal as close as possible to the enclosure will reduce problems with purging the dea... | https://2023.antflix.net#501.15(A)(2) |
Chaptewr 5 Special Occupancies | 501.15(A)(3) | Where two or more explosionproof enclosures that require conduit seals are connected by nipples or runs of conduit not more than 900 mm (36 in.) long, a single conduit seal in each such nipple connection or run of conduit shall be considered sufficient if the seal is located not more than 450 mm (18 in.) from either en... | https://2023.antflix.net#501.15(A)(3) |
Chaptewr 5 Special Occupancies | 501.15(A)(4) | A conduit seal shall be required in each conduit run leaving a Division 1 location. The sealing fitting shall be permitted to be installed on either side of the boundary within 3.05 m (10 ft) of the boundary, and it shall be designed and installed to minimize the amount of gas or vapor within the portion of the conduit... | https://2023.antflix.net#501.15(A)(4) |
Chaptewr 5 Special Occupancies | 501.15(B) | In Class I, Division 2 locations, conduit seals shall be located in accordance with 501.15(B)(1) and (B)(2). [501.15(B)](https://2023.antflix.net#501.15(B)) | https://2023.antflix.net#501.15(B) |
Chaptewr 5 Special Occupancies | 501.15(B)(1) | For connections to enclosures that are required to be explosionproof, a conduit seal shall be provided in accordance with 501.15(A)(1)(1) and (A)(3). All portions of the conduit run or nipple between the seal and enclosure shall comply with 501.10(A). [501.15(B)(1)](https://2023.antflix.net#501.15(B)(1)) | https://2023.antflix.net#501.15(B)(1) |
Chaptewr 5 Special Occupancies | 501.15(B)(2) | A conduit seal shall be required in each conduit run leaving a Class I. Division 2 location. The sealing fitting shall be permitted to be installed on either side of the boundary within 3.05 m (10 ft) of the boundary and it shall be designed and installed to minimize the amount of gas or vapor within the portion of the... | https://2023.antflix.net#501.15(B)(2) |
Chaptewr 5 Special Occupancies | 501.15(C) | Seals installed in Class I, Division 1 and Division 2 locations shall comply with 501.15(C)(1) through (C)(6). Exception: Seals that are not required to be explosionproof by 501.15(B)(2) or 504. 70 shall not be required to comply with 501.15(C). [501.15(C)](https://2023.antflix.net#501.15(C)) | https://2023.antflix.net#501.15(C) |
Chaptewr 5 Special Occupancies | 501.15(C)(1) | Enclosures that contain connections or equipment shall be provided with an integral sealing means, or sealing fittings listed for the location shall be used. Sealing fittings shall be listed for use with one or more specific compounds and shall be accessible. [501.15(C)(1)](https://2023.antflix.net#501.15(C)(1)) | https://2023.antflix.net#501.15(C)(1) |
Chaptewr 5 Special Occupancies | 501.15(C)(2) | The compound shall provide a seal to minimize the passage of gas and/or vapors through the sealing fitting and shall not be affected by the surrounding atmosphere or liquids. The melting point of the compound shall not be less than 93°C (200°F). [501.15(C)(2)](https://2023.antflix.net#501.15(C)(2)) | https://2023.antflix.net#501.15(C)(2) |
Chaptewr 5 Special Occupancies | 501.15(C)(3) | The thickness of the sealing compound installed in completed seals, other than listed cable sealing fittings, shall not be less than the metric designator (trade size) of the sealing fitting expressed in the units of measurement employed; however, in no case shall the thickness of the compound be less than 16 mm (5/8 i... | https://2023.antflix.net#501.15(C)(3) |
Chaptewr 5 Special Occupancies | 501.15(C)(4) | Splices and taps shall not be made in fittings intended only for sealing with compound; nor shall other fittings in which splices or taps are made be filled with compound. [501.15(C)(4)](https://2023.antflix.net#501.15(C)(4)) | https://2023.antflix.net#501.15(C)(4) |
Chaptewr 5 Special Occupancies | 501.15(C)(5) | An entire assembly shall be identified for the location where the equipment that may produce arcs, sparks, or high temperatures is located in a compartment that is separate from the compartment containing splices or taps, and an integral seal is provided where conductors pass from one compartment to the other. In Divis... | https://2023.antflix.net#501.15(C)(5) |
Chaptewr 5 Special Occupancies | 501.15(C)(6) | The cross-sectional area of the conductors or optical fiber tubes (metallic or nonmetallic) permitted in a seal shall not exceed 25 percent of the cross-sectional area of a rigid metal conduit of the same trade size unless the seal is specifically identified for a higher percentage of fill. [501.15(C)(6)](https://2023.... | https://2023.antflix.net#501.15(C)(6) |
Chaptewr 5 Special Occupancies | 501.15(D) | In Division 1 locations, cable seals shall be located according to 501.15(D)(1) through (D)(3). [501.15(D)](https://2023.antflix.net#501.15(D)) | https://2023.antflix.net#501.15(D) |
Chaptewr 5 Special Occupancies | 501.15(D)(1) | Cables shall be sealed at all terminations with sealing fittings. The seals at all terminations shall be in accordance with 501.15(C) and shall be installed within 450 mm (18 in.) of the enclosure or as required by the enclosure marking. Only threaded couplings or explosionproof fittings such as unions, reducers, elbow... | https://2023.antflix.net#501.15(D)(1) |
Chaptewr 5 Special Occupancies | 501.15(D)(2) | Cables with a gas/vaportight continuous sheath capable of transmitting gases or vapors through the cable core, installed in conduit, shall be sealed in the Class I, Division 1 location after the jacket and any other coverings have been removed such that the sealing compound can surround each individual insulated conduc... | https://2023.antflix.net#501.15(D)(2) |
Chaptewr 5 Special Occupancies | 501.15(D)(3) | Each multiconductor cable installed in conduit shall be considered as a single conductor if the cable is incapable of transmitting gases or vapors through the cable core. These cables shall be sealed in accordance with 501.15(A). [501.15(D)(3)](https://2023.antflix.net#501.15(D)(3)) | https://2023.antflix.net#501.15(D)(3) |
Chaptewr 5 Special Occupancies | 501.15(E) | In Division 2 locations, cable seals shall be located in accordance with 501.15(E)(1) through (E)(4). Exception: Cables with an unbroken gas/vaportight, continuous sheath shall be permitted to pass through a Division 2 location without seals. [501.15(E)](https://2023.antflix.net#501.15(E)) | https://2023.antflix.net#501.15(E) |
Chaptewr 5 Special Occupancies | 501.15(E)(1) | Cables entering enclosures that are required to be explosionproof shall be sealed at the point of entrance into the enclosure. The sealing fitting shall comply with 501.15(B)(1) or be explosionproof. Multiconductor or optical multifiber cables with a gas/vaportight continuous sheath capable of transmitting gases or vap... | https://2023.antflix.net#501.15(E)(1) |
Chaptewr 5 Special Occupancies | 501.15(E)(2) | Cables that have a gas/vaportight continuous sheath and do not transmit gases or vapors through the cable core in excess of the quantity permitted for seal fittings shall not be required to be sealed except as required in 501.15(E)(1). The minimum length of such a cable run shall not be less than the length needed to l... | https://2023.antflix.net#501.15(E)(2) |
Chaptewr 5 Special Occupancies | 501.15(E)(3) | Cables with a gas/vaportight continuous sheath capable of transmitting gases or vapors through the cable core shall not be required to be sealed except as required in 501.15(E)(1), unless the cable is attached to process equipment or devices that may cause a pressure in excess of 1500 pascals (6 in. of water) to be exe... | https://2023.antflix.net#501.15(E)(3) |
Chaptewr 5 Special Occupancies | 501.15(E)(4) | Cables that do not have a gas/vaportight continuous sheath shall be sealed at the boundary of the Division 2 and unclassified location in such a manner as to minimize the passage of gases or vapors into an unclassified location. [501.15(E)(4)](https://2023.antflix.net#501.15(E)(4)) | https://2023.antflix.net#501.15(E)(4) |
Chaptewr 5 Special Occupancies | 501.15(F)(1) | Where there is a probability that liquid or other condensed vapor may be trapped within enclosures for control equipment or at any point in the raceway system, approved means shall be provided to prevent accumulation or to permit periodic draining of such liquid or condensed vapor. [501.15(F)(1)](https://2023.antflix.n... | https://2023.antflix.net#501.15(F)(1) |
Chaptewr 5 Special Occupancies | 501.15(F)(2) | Where liquid or condensed vapor may accumulate within motors or generators, joints and conduit systems shall be arranged to minimize the entrance of liquid. If means to prevent accumulation or to permit periodic draining are necessary, such means shall be provided at the time of manufacture and shall be considered an i... | https://2023.antflix.net#501.15(F)(2) |
Chaptewr 5 Special Occupancies | 501.17 | Process-connected equipment, including, but not limited to, canned pumps, submersible pumps, and flow, pressure, temperature, or analysis measurement instruments, shall be sealed with process seals. A process seal shall be a device that prevents the migration of process fluids from the designed containment into the ext... | https://2023.antflix.net#501.17 |
Chaptewr 5 Special Occupancies | 501.20 | Where condensed vapors or liquids may collect on, or come in contact with, the insulation on conductors, such insulation shall be of a type identified for use under such conditions; or the insulation shall be protected by a sheath of lead or by other approved means. [501.20](https://2023.antflix.net#501.20) | https://2023.antflix.net#501.20 |
Chaptewr 5 Special Occupancies | 501.25 | There shall be no uninsulated exposed parts, such as electrical conductors, buses, terminals, or components, that operate at more than 30 volts (15 volts in wet locations). These parts shall additionally be protected by a protection technique according to 500.7(E), (F), or (G) that is suitable for the location. [501.25... | https://2023.antflix.net#501.25 |
Chaptewr 5 Special Occupancies | 501.30 | Regardless of the voltage of the electrical system, wiring systems and equipment shall comply with 501.30(A) and (B). [501.30](https://2023.antflix.net#501.30) | https://2023.antflix.net#501.30 |
Chaptewr 5 Special Occupancies | 501.30(A) | Wiring systems and equipment shall be grounded in accordance with Part I and Part VI of Article 250, as applicable. [501.30(A)](https://2023.antflix.net#501.30(A)) | https://2023.antflix.net#501.30(A) |
Chaptewr 5 Special Occupancies | 501.30(B) | Bonding shall comply with Part I and Part V of Article 250, as applicable, and 501.30(B)(1) and (B)(2). [501.30(B)](https://2023.antflix.net#501.30(B)) | https://2023.antflix.net#501.30(B) |
Chaptewr 5 Special Occupancies | 501.30(B)(1) | Bonding shall comply with 501.30(B)(1)(a) and (B)(1)(b). The locknut-bushing and double-locknut types of contacts shall not be depended on for bonding purposes, but bonding jumpers with identified fittings or other approved means of bonding shall be used. These bonding means shall apply to all metal raceways, fittings,... | https://2023.antflix.net#501.30(B)(1) |
Chaptewr 5 Special Occupancies | 501.30(B)(2) | Flexible metal conduit and liquidtight flexible metal conduit shall comply with 501.30(B)(2)(a) and (B)(2)(b). Flexible metal conduit and liquidtight flexible metal conduit shall include an equipment bonding jumper of the wire type in accordance with 250.102.In Class I, Division 2 locations, the bonding jumper shall no... | https://2023.antflix.net#501.30(B)(2) |
Chaptewr 5 Special Occupancies | 501.35(A) | Surge arresters, surge-protective devices, and capacitors shall be installed in enclosures identified for Class I, Division 1 locations. Surge-protective capacitors shall be of a type designed for specific duty. [501.35(A)](https://2023.antflix.net#501.35(A)) | https://2023.antflix.net#501.35(A) |
Chaptewr 5 Special Occupancies | 501.35(B) | Surge arresters and surge-protective devices shall be nonarcing, such as metal-oxide varistor (MOV) sealed type, and surge-protective capacitors shall be of a type designed for specific duty. Enclosures shall be permitted to be of the general-purpose type. Surge protection of types other than described in this paragrap... | https://2023.antflix.net#501.35(B) |
Chaptewr 5 Special Occupancies | 501.100(A) | In Class I, Division 1 locations, transformers and capacitors shall comply with 501.100(A)(1) and (A)(2). [501.100(A)](https://2023.antflix.net#501.100(A)) | https://2023.antflix.net#501.100(A) |
Chaptewr 5 Special Occupancies | 501.100(A)(1) | Transformers and capacitors containing a liquid that will burn shall be installed only in vaults that comply with 450.41 through 450.48 and with (1) through (4) as follows: There shall be no door or other communicating opening between the vault and the Division 1 location.Ample ventilation shall be provided for the con... | https://2023.antflix.net#501.100(A)(1) |
Chaptewr 5 Special Occupancies | 501.100(A)(2) | Transformers and capacitors that do not contain a liquid that will burn shall be installed in vaults complying with 501.100(A)(1) or be identified for Class I locations. [501.100(A)(2)](https://2023.antflix.net#501.100(A)(2)) | https://2023.antflix.net#501.100(A)(2) |
Chaptewr 5 Special Occupancies | 501.100(B) | In Class I, Division 2 locations, transformers shall comply with 450.21 through 450.27, and capacitors shall comply with 460.3 through 460.28. [501.100(B)](https://2023.antflix.net#501.100(B)) | https://2023.antflix.net#501.100(B) |
Chaptewr 5 Special Occupancies | 501.105(A) | In Class I, Division 1 locations, meters, instruments, and relays, including kilowatt-hour meters, instrument transformers, resistors, rectifiers, and thermionic tubes, shall be provided with enclosures identified for Class I, Division 1 locations. Enclosures for Class I, Division 1 locations include explosionproof enc... | https://2023.antflix.net#501.105(A) |
Chaptewr 5 Special Occupancies | 501.105(B) | In Class I, Division 2 locations, meters, instruments, and relays shall comply with 501.105(B)(2) through (B)(6). [501.105(B)](https://2023.antflix.net#501.105(B)) | https://2023.antflix.net#501.105(B) |
Chaptewr 5 Special Occupancies | 501.105(B)(1) | Where an assembly is made up of components for which general-purpose enclosures are acceptable as provided in 501.105(B)(1), (B)(2), and (B)(3), a single general-purpose enclosure shall be acceptable for the assembly. Where such an assembly includes any of the equipment described in 501.105(B)(1), 501.105(B)(2), and 50... | https://2023.antflix.net#501.105(B)(1) |
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