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Chapter 7 Special Conditions | 700.16(C) | Where high-intensity discharge lighting such as high- and low-pressure sodium, mercury vapor, and metal halide is used as the sole source of normal illumination, the emergency lighting system shall be required to operate until normal illumination has been restored. [700.16(C)](https://2023.antflix.net#700.16(C)) | https://2023.antflix.net#700.16(C) |
Chapter 7 Special Conditions | 700.16(D) | Where an emergency system is installed, emergency illumination shall be provided in the area of the disconnecting means required by 225.31 and 230.70, as applicable, where the disconnecting means are installed indoors. Exception: Alternative means that ensure that the emergency lighting illumination level is maintained shall be permitted. [700.16(D)](https://2023.antflix.net#700.16(D)) | https://2023.antflix.net#700.16(D) |
Chapter 7 Special Conditions | 700.17 | Branch circuits that supply emergency lighting shall be installed to provide service from a source complying with 700.12 when the normal supply for lighting is interrupted. Such installations shall provide either of the following: An emergency lighting supply, independent of the normal lighting supply, with provisions for automatically transferring the emergency lights upon the event of failure of the normal lighting supply.Two or more branch circuits supplied from separate and complete systems with independent power sources. One of the two power sources and systems shall be part of the emergency system, and the other shall be permitted to be part of the normal power source and system. Each system shall provide sufficient power for emergency lighting purposes.Unless both systems are used for regular lighting purposes and both are kept lighted, means shall be provided for automatically energizing either system upon failure of the other. Either system or both systems shall be permitted to be a part of the general lighting of the protected occupancy if circuits supplying lights for emergency illumination are installed in accordance with other sections of this article. [700.17](https://2023.antflix.net#700.17) | https://2023.antflix.net#700.17 |
Chapter 7 Special Conditions | 700.18 | For branch circuits that supply equipment classed as emergency, there shall be an emergency system supply source to which the load will be transferred automatically upon the failure of the normal supply. [700.18](https://2023.antflix.net#700.18) | https://2023.antflix.net#700.18 |
Chapter 7 Special Conditions | 700.19 | The branch circuit serving emergency lighting and power circuits shall not be part of a multiwire branch circuit. [700.19](https://2023.antflix.net#700.19) | https://2023.antflix.net#700.19 |
Chapter 7 Special Conditions | 700.20 | The switch or switches installed in emergency lighting circuits shall be arranged so that only authorized persons have control of emergency lighting. Exception No. I: Where two or more single-throw switches are connected in parallel to control a single circuit, at least one of these switches shall be accessible only to authorized persons. Exception No. 2: Additional switches that act only to put emergency lights into operation but not disconnect them shall be permissible. Switches connected in series or 3- and 4-way switches shall not be used. [700.20](https://2023.antflix.net#700.20) | https://2023.antflix.net#700.20 |
Chapter 7 Special Conditions | 700.21 | All manual switches for controlling emergency circuits shall be in locations convenient to authorized persons responsible for their actuation. In facilities covered by Articles 518 and 520, a switch for controlling emergency lighting systems shall be located in the lobby or at a place conveniently accessible thereto. In no case shall a control switch for emergency lighting be placed in a motion-picture projection booth or on a stage or platform. Exception: Where multiple switches are provided, one such switch shall be permitted in such locations where arranged so that it can only energize the circuit but cannot de-energize the circuit. [700.21](https://2023.antflix.net#700.21) | https://2023.antflix.net#700.21 |
Chapter 7 Special Conditions | 700.22 | Those lights on the exterior of a building that are not required for illumination when there is sufficient daylight shall be permitted to be controlled by an automatic light-actuated device. [700.22](https://2023.antflix.net#700.22) | https://2023.antflix.net#700.22 |
Chapter 7 Special Conditions | 700.23 | A dimmer or relay system containing more than one dimmer or relay and listed for use in emergency systems shall be permitted to be used as a control device for energizing emergency lighting circuits. Upon failure of normal power, the dimmer or relay system shall be permitted to selectively energize only those branch circuits required to provide minimum emergency illumination using a control bypass function. Where the dimmer or relay system is fed by a normal/emergency power source from an upstream transfer switch, normal power sensing for this function shall be permitted to be from a normal-only power source upstream of the transfer switch. All branch circuits supplied by the dimmer or relay system cabinet shall comply with the wiring methods of Part II of Article 700. [700.23](https://2023.antflix.net#700.23) | https://2023.antflix.net#700.23 |
Chapter 7 Special Conditions | 700.24 | Where emergency illumination is provided by one or more directly controlled emergency luminaires that, upon loss of normal power, respond to an external control input to establish the required emergency illumination level, such directly controlled emergency luminaries shall be listed for use in emergency systems. Luminaires that are energized to the required emergency illumination level by disconnection of their control input by a listed emergency lighting control device shall not be required to be listed for use in emergency systems. [700.24](https://2023.antflix.net#700.24) | https://2023.antflix.net#700.24 |
Chapter 7 Special Conditions | 700.25 | Emergency lighting loads supplied by branch circuits rated at not greater than 20 amperes shall be permitted to be transferred from the normal branch circuit to an emergency branch circuit using a listed branch circuit emergency lighting transfer switch. The mechanically held requirement of 700.5(C) shall not apply to listed branch circuit emergency lighting transfer switches. [700.25](https://2023.antflix.net#700.25) | https://2023.antflix.net#700.25 |
Chapter 7 Special Conditions | 700.26 | If an emergency lighting load is automatically energized upon loss of the normal supply, a listed automatic load control relay shall be permitted to energize the load. The load control relay shall not be used as transfer equipment. [700.26](https://2023.antflix.net#700.26) | https://2023.antflix.net#700.26 |
Chapter 7 Special Conditions | 700.27 | Devices that combine control signals with Class 2 emergency power on a single circuit shall be listed as emergency lighting control devices. Informational Note: An example of a device combining control signals with Class 2 emergency power sources is a Power over Ethernet (PoE) switch. [700.27](https://2023.antflix.net#700.27) | https://2023.antflix.net#700.27 |
Chapter 7 Special Conditions | 700.30 | The branch-circuit overcurrent devices in emergency circuits shall be accessible to authorized persons only. [700.30](https://2023.antflix.net#700.30) | https://2023.antflix.net#700.30 |
Chapter 7 Special Conditions | 700.31 | The alternate source for emergency systems shall not be required to provide ground-fault protection of equipment with automatic disconnecting means. Ground-fault indication at the emergency source shall be provided in accordance with 700.6(D) if ground-fault protection of equipment with automatic disconnecting means is not provided. [700.31](https://2023.antflix.net#700.31) | https://2023.antflix.net#700.31 |
Chapter 7 Special Conditions | 700.32(A) | Emergency system(s) overcurrent protective devices (OCPDs) shall be selectively coordinated with all supply-side and load-side OCPDs. Selective coordination shall be selected by a licensed professional engineer or other qualified persons engaged primarily in the design, installation, or maintenance of electrical systems. The selection shall be documented and made available to those authorized to design, install, inspect, maintain, and operate the system. [700.32(A)](https://2023.antflix.net#700.32(A)) | https://2023.antflix.net#700.32(A) |
Chapter 7 Special Conditions | 700.32(B) | Where emergency system(s) OCPDs are replaced, they shall be reevaluated to ensure selective coordination is maintained with all supply-side and load-side OCPDs. [700.32(B)](https://2023.antflix.net#700.32(B)) | https://2023.antflix.net#700.32(B) |
Chapter 7 Special Conditions | 700.32(C) | If modifications, additions, or deletions to the emergency system(s) occur, selective coordination of the emergency system(s) OCPDs with all supply-side and load-side OCPDs shall be reevaluated.
Exception: Selective coordination shall not be required between two overcurrent devices located in series if no loads are connected in parallel with the downstream device.
Informational Note: See Informational Note Figure 700.32(C) for an example of how emergency system OCPDs selectively coordinate with all supply-side OCPDs.
OCPD D selectively coordinates with OCPDs C, F, E, B, and A.
OCPD C selectively coordinates with OCPDs F, E, B, and A.
OCPD F selectively coordinates with OCPD E.
OCPD B is not required to selectively coordinate with OCPD A because OCPD B is not an emergency system OCPD.
Informational Note Figure 700.32(C) Emergency System Selective Coordination. [700.32(C)](https://2023.antflix.net#700.32(C)) | https://2023.antflix.net#700.32(C) |
Chapter 7 Special Conditions | 701.1 | This article applies to the electrical safety of the installation, operation, and maintenance of legally required standby systems consisting of circuits and equipment intended to supply, distribute, and control electricity to required facilities for illumination or power, or both, when the normal electrical supply or system is interrupted. The systems covered by this article consist only of those that are permanently installed in their entirety, including the power source. Informational Note No. 1: See NFPA 99-2018, Health Care Facilities Code, for further information. Informational Note No. 2: See NFPA 110-2019, Standard for Emergency and Standby Power Systems, for further information regarding performance of emergency and standby power systems. Informational Note No. 3: See ANSI/IEEE 446-1995, Recommended Practice for Emergency and Standby Power Systems for Industrial and Commercial Applications, for further information. Informational Note No. 4: Legally required standby systems are typically installed to serve loads, such as heating and refrigeration systems, communications systems, ventilation and smoke removal systems, sewage disposal systems, lighting systems, and industrial processes that, when stopped during any interruption of the normal electrical supply, could create hazards or hamper rescue or firefighting operations. Informational Note No. 5: Legally required standby systems are considered level one systems when failure to perform could result in loss of human life or serious injuries and level two systems when failure of legally required standby systems to perform is less critical to human life and safety when applying NFPA 110-2019, Standard for Emergency Standby Power Systems. [701.1](https://2023.antflix.net#701.1) | https://2023.antflix.net#701.1 |
Chapter 7 Special Conditions | 701.2 | Reconditioned transfer switches shall not be permitted. [701.2](https://2023.antflix.net#701.2) | https://2023.antflix.net#701.2 |
Chapter 7 Special Conditions | 701.3(A) | The authority having jurisdiction shall conduct or witness the commissioning of the complete system upon installation. [701.3(A)](https://2023.antflix.net#701.3(A)) | https://2023.antflix.net#701.3(A) |
Chapter 7 Special Conditions | 701.3(B) | Systems shall be tested periodically on a schedule and in a manner approved by the authority having jurisdiction to ensure the systems are maintained in proper operating condition. [701.3(B)](https://2023.antflix.net#701.3(B)) | https://2023.antflix.net#701.3(B) |
Chapter 7 Special Conditions | 701.3(C) | Legally required standby system equipment shall be maintained in accordance with manufacturer instructions and industry standards. [701.3(C)](https://2023.antflix.net#701.3(C)) | https://2023.antflix.net#701.3(C) |
Chapter 7 Special Conditions | 701.3(D) | A written record shall be kept on such tests and maintenance. [701.3(D)](https://2023.antflix.net#701.3(D)) | https://2023.antflix.net#701.3(D) |
Chapter 7 Special Conditions | 701.3(E) | Means for testing legally required standby systems under load shall be provided. Informational Note: See NFPA 110-2019, Standard for Emergency and Standby Power Systems, for information on testing and maintenance of emergency power supply systems (EPSSs). [701.3(E)](https://2023.antflix.net#701.3(E)) | https://2023.antflix.net#701.3(E) |
Chapter 7 Special Conditions | 701.4(A) | Legally required standby system equipment shall be suitable for the available fault current at its terminals. [701.4(A)](https://2023.antflix.net#701.4(A)) | https://2023.antflix.net#701.4(A) |
Chapter 7 Special Conditions | 701.4(B) | A legally required standby system shall have adequate capacity in accordance with Parts I through IV of Article 220 or by another approved method. The system capacity shall be sufficient for the rapid load changes and transient power and energy requirements associated with any expected loads. [701.4(B)](https://2023.antflix.net#701.4(B)) | https://2023.antflix.net#701.4(B) |
Chapter 7 Special Conditions | 701.4(C) | The alternate power source shall be permitted to supply legally required standby and optional standby system loads where the alternate source has adequate capacity or where load management (that includes automatic selective load pickup and load shedding) is provided that will ensure adequate power to the legally required standby circuits. [701.4(C)](https://2023.antflix.net#701.4(C)) | https://2023.antflix.net#701.4(C) |
Chapter 7 Special Conditions | 701.4(D) | Parallel operation shall comply with Part I or Part II of Article 705 where the legally required source capacity required to supply the legally required load is maintained at all times. Parallel operation of the legally required source(s) shall consist of the sources specified in 701.4(D)(1) and (D)(2). [701.4(D)](https://2023.antflix.net#701.4(D)) | https://2023.antflix.net#701.4(D) |
Chapter 7 Special Conditions | 701.4(D)(1) | The alternate power source shall be permitted to operate in parallel with the normal source in compliance with Part I or Part II of Article 705 where the capacity required to supply the legally required standby load is maintained at all times. Any operating condition that results in less than the required source capacity shall initiate a legally required standby source malfunction signal in 701.6(A). Parallel operation shall be permitted for satisfying the test requirements of 701.3(B), provided all other conditions of 701.3 are met. Informational Note: Peak load shaving is one application for parallel source operation. [701.4(D)(1)](https://2023.antflix.net#701.4(D)(1)) | https://2023.antflix.net#701.4(D)(1) |
Chapter 7 Special Conditions | 701.4(D)(2) | Legally required standby sources shall be permitted to operate in parallel where the necessary equipment to establish and maintain a synchronous condition is provided. [701.4(D)(2)](https://2023.antflix.net#701.4(D)(2)) | https://2023.antflix.net#701.4(D)(2) |
Chapter 7 Special Conditions | 701.5(A) | Transfer equipment shall be automatic, listed, and marked for emergency system or legally required standby use. Transfer equipment shall be designed and installed to prevent the inadvertent interconnection of normal and alternate sources of supply in any operation of the transfer equipment. Transfer equipment and electric power production systems installed to permit operation in parallel with the normal source shall meet the requirements of Article 705. Meter-mounted transfer switches shall not be permitted for legally required system use. [701.5(A)](https://2023.antflix.net#701.5(A)) | https://2023.antflix.net#701.5(A) |
Chapter 7 Special Conditions | 701.5(B) | Means to bypass and isolate the transfer switch equipment shall be permitted. Where bypass isolation switches are used, inadvertent parallel operation shall be avoided. [701.5(B)](https://2023.antflix.net#701.5(B)) | https://2023.antflix.net#701.5(B) |
Chapter 7 Special Conditions | 701.5(C) | Automatic transfer switches shall be electrically operated and mechanically held. [701.5(C)](https://2023.antflix.net#701.5(C)) | https://2023.antflix.net#701.5(C) |
Chapter 7 Special Conditions | 701.5(D) | The short-circuit current rating of the transfer equipment, based on the specific overcurrent protective device type and settings protecting the transfer equipment, shall be field marked on the exterior of the transfer equipment. [701.5(D)](https://2023.antflix.net#701.5(D)) | https://2023.antflix.net#701.5(D) |
Chapter 7 Special Conditions | 701.6 | Audible and visual signal devices shall be provided, where practicable, for the purposes described in 701.6(A), (B), (C), and (D). [701.6](https://2023.antflix.net#701.6) | https://2023.antflix.net#701.6 |
Chapter 7 Special Conditions | 701.6(A) | Malfunction signals indicate a malfunction of the standby source. [701.6(A)](https://2023.antflix.net#701.6(A)) | https://2023.antflix.net#701.6(A) |
Chapter 7 Special Conditions | 701.6(B) | Load carrying signals indicate that the standby source is carrying load. [701.6(B)](https://2023.antflix.net#701.6(B)) | https://2023.antflix.net#701.6(B) |
Chapter 7 Special Conditions | 701.6(C) | Battery charging malfunction signals indicate charging malfunction on a battery required for source readiness, including the prime mover starting battery. Informational Note: See NFPA 110-2019, Standard for Emergency and Standby Power Systems, for signals for generator sets. [701.6(C)](https://2023.antflix.net#701.6(C)) | https://2023.antflix.net#701.6(C) |
Chapter 7 Special Conditions | 701.6(D) | Ground-fault signals indicate a ground fault in solidly grounded wye, legally required standby systems of more than 150 volts to ground and circuit-protective devices rated 1000 amperes or more. The sensor for the ground-fault signal devices shall be located at, or ahead of, the main system disconnecting means for the legally required standby source, and the maximum setting of the signal devices shall be for a ground-fault current of 1200 amperes. Instructions on the course of action to be taken in the event of an indicated ground fault shall be located at or near the sensor location. For systems with multiple emergency sources connected to a paralleling bus, the ground-fault sensor shall be permitted at an alternate location. Informational Note: See NFPA 110-2019, Standard for Emergency and Standby Power Systems, for signals for generator sets. [701.6(D)](https://2023.antflix.net#701.6(D)) | https://2023.antflix.net#701.6(D) |
Chapter 7 Special Conditions | 701.7(A) | A sign shall be placed at the service entrance indicating type and location of each on-site legally required standby power source. Exception: A sign shall not be required for individual unit equipment as specified in 701.12(1). [701.7(A)](https://2023.antflix.net#701.7(A)) | https://2023.antflix.net#701.7(A) |
Chapter 7 Special Conditions | 701.7(B) | Where removal of a grounding or bonding connection in normal power source equipment interrupts the grounding electrode conductor connection to the alternate power source(s) grounded conductor, a warning sign shall be installed at the normal power source equipment stating: WARNINGSHOCK HAZARD EXISTS IF GROUNDING ELECTRODECONDUCTOR OR BONDING JUMPER CONNECTION INTHIS EQUIPMENT IS REMOVED WHILE ALTERNATESOURCE(S) IS ENERGIZED. The warning sign(s) or label(s) shall comply with 110.21(B). [701.7(B)](https://2023.antflix.net#701.7(B)) | https://2023.antflix.net#701.7(B) |
Chapter 7 Special Conditions | 701.10(A) | The legally required standby system wiring shall be permitted to occupy the same raceways, cables, boxes, and cabinets with other general wiring. [701.10(A)](https://2023.antflix.net#701.10(A)) | https://2023.antflix.net#701.10(A) |
Chapter 7 Special Conditions | 701.10(B) | Wiring from a legally required source to supply legally required and other (nonlegally required) loads shall be in accordance with the following: The common bus of switchgear, sections of a switchboard, or individual enclosures shall be either of the following:Supplied by single or multiple feeders without overcurrent protection at the sourceSupplied by single or multiple feeders with overcurrent protection, provided that the overcurrent protection that is common to a legally required system and any nonlegally required system(s) is selectively coordinated with the next downstream overcurrent protective device in the nonlegally required system(s)
Informational Note: See Informational Note Figure 701.10(B)(1) and Informational Note Figure 701.10(B)(2) for further information.
Informational Note: See Informational Note Figure 701.10(B)(1) Single or Multiple Feeders Without Overcurrent Protection.Informational Note Figure 701.10(B)(2) Single or Multiple Feeders with Overcurrent Protection. [701.10(B)](https://2023.antflix.net#701.10(B)) | https://2023.antflix.net#701.10(B) |
Chapter 7 Special Conditions | 701.12 | Current supply shall be such that, in the event of failure of the normal supply to, or within, the building or group of buildings concerned, legally required standby power will be available within the time required for the application but not to exceed 60 seconds. The supply system for legally required standby purposes, in addition to the normal services to the building, shall be permitted to comprise one or more of the types of systems described in 701.12(A) through (I). Unit equipment in accordance with 701.12(1) shall satisfy the applicable requirements of this article. [701.12](https://2023.antflix.net#701.12) | https://2023.antflix.net#701.12 |
Chapter 7 Special Conditions | 701.12(A) | In selecting a legally required standby source of power, consideration shall be given to the type of service to be rendered, whether of short-time duration or long duration. [701.12(A)](https://2023.antflix.net#701.12(A)) | https://2023.antflix.net#701.12(A) |
Chapter 7 Special Conditions | 701.12(B) | Consideration shall be given to the location or design, or both, of all equipment to minimize the hazards that might cause complete failure due to floods, fires, icing, and vandalism. Informational Note: See ANSI/IEEE 493-2007, Recommended Practice for the Design of Reliable Industrial and Commercial Power Systems, for further information. [701.12(B)](https://2023.antflix.net#701.12(B)) | https://2023.antflix.net#701.12(B) |
Chapter 7 Special Conditions | 701.12(C) | The alternate power source shall be of suitable rating and capacity to supply and maintain the total load for the duration determined by the system design. In no case shall the duration be less than 2 hours of system operation. Additionally, the power source shall comply with 701.12(C)(1) through (C)(5) as applicable. Informational Note: See NFPA 110-2022, Standard for Emergency and Standby Power Systems, for information on classification of emergency power supply systems (EPSS). [701.12(C)](https://2023.antflix.net#701.12(C)) | https://2023.antflix.net#701.12(C) |
Chapter 7 Special Conditions | 701.12(C)(1) | An on-site fuel supply shall be provided, sufficient for not less than 2 hours operation of the system. [701.12(C)(1)](https://2023.antflix.net#701.12(C)(1)) | https://2023.antflix.net#701.12(C)(1) |
Chapter 7 Special Conditions | 701.12(C)(2) | Where power is needed for the operation of the fuel transfer pumps to deliver fuel to the source, these pumps shall be connected to the legally required standby power system. [701.12(C)(2)](https://2023.antflix.net#701.12(C)(2)) | https://2023.antflix.net#701.12(C)(2) |
Chapter 7 Special Conditions | 701.12(C)(3) | Sources shall not be solely dependent on a public utility gas system for their fuel supply or on a municipal water supply for their cooling systems. Exception: Where approved by the authority having jurisdiction, the use of other than on-site fuels shall be permitted where there is a low probability of a simultaneous failure of both the off-site fuel delivery system and power from the outside electrical utility company. Where a public gas system is approved, the requirements of 701.12(C)(1) shall not apply. [701.12(C)(3)](https://2023.antflix.net#701.12(C)(3)) | https://2023.antflix.net#701.12(C)(3) |
Chapter 7 Special Conditions | 701.12(C)(4) | Storage batteries and UPS used to supply standby illumination shall be of suitable rating and capacity to supply and maintain the total load for a minimum period of 11/2 hours, without the voltage applied to the load falling below 871/2 percent of nominal voltage. Automotive-type batteries shall not be used. An automatic battery charging means shall be provided. [701.12(C)(4)](https://2023.antflix.net#701.12(C)(4)) | https://2023.antflix.net#701.12(C)(4) |
Chapter 7 Special Conditions | 701.12(C)(5) | Where dual fuel sources are used, means shall be provided for automatically transferring from one fuel source to another. [701.12(C)(5)](https://2023.antflix.net#701.12(C)(5)) | https://2023.antflix.net#701.12(C)(5) |
Chapter 7 Special Conditions | 701.12(D)(1) | For a generator set driven by a prime mover approved by the authority having jurisdiction and sized in accordance with 701.4, means shall be provided for automatically starting the prime mover upon failure of the normal power source and for automatic transfer and operation of all required electrical circuits. A time-delay feature permitting a 15-minute setting shall be provided to avoid retransfer in case of short-time reestablishment of the normal source. [701.12(D)(1)](https://2023.antflix.net#701.12(D)(1)) | https://2023.antflix.net#701.12(D)(1) |
Chapter 7 Special Conditions | 701.12(D)(2) | Where a storage battery is used for control or signal power or as the means of starting the prime mover, it shall be suitable for the purpose and shall be equipped with an automatic charging means independent of the generator set. [701.12(D)(2)](https://2023.antflix.net#701.12(D)(2)) | https://2023.antflix.net#701.12(D)(2) |
Chapter 7 Special Conditions | 701.12(D)(3) | If an outdoor-housed generator set is equipped with a readily accessible disconnecting means in accordance with 445.18, and the disconnecting means is located within sight of the building or structure supplied, an additional disconnecting means shall not be required where ungrounded conductors serve or pass through the building or structure. Where the generator supply conductors terminate at a disconnecting means in or on a building or structure, the disconnecting means shall meet the requirements of 225.36. [701.12(D)(3)](https://2023.antflix.net#701.12(D)(3)) | https://2023.antflix.net#701.12(D)(3) |
Chapter 7 Special Conditions | 701.12(E) | Stored energy power supply systems shall comply with 701.12(E)(1) and (E)(2). [701.12(E)](https://2023.antflix.net#701.12(E)) | https://2023.antflix.net#701.12(E) |
Chapter 7 Special Conditions | 701.12(E)(1) | Systems shall consist of one or more of the following system types: Uninterruptible power supply (UPS)Informational Note: See UL 1778, Uninterruptable Power Systems, and UL 924, Emergency Lighting and Power Equipment, for further information.Fuel cell systemEnergy storage system (ESS)Storage batteryOther approved equivalent stored energy sources that comply with 701.12 [701.12(E)(1)](https://2023.antflix.net#701.12(E)(1)) | https://2023.antflix.net#701.12(E)(1) |
Chapter 7 Special Conditions | 701.12(E)(2) | The systems in 701.12(E)(1) shall be installed with the fire protection, suppression, ventilation, and separation requirements specified in the manufacturer's instructions or equipment listing. Informational Note: See NFPA 853-2020, Standard for the Installation of Stationary Fuel Cell Power Systems, and NFPA 855-2020, Standard for the Installation of Stationary Energy Storage Systems, for additional information on fire protection installation requirements. [701.12(E)(2)](https://2023.antflix.net#701.12(E)(2)) | https://2023.antflix.net#701.12(E)(2) |
Chapter 7 Special Conditions | 701.12(F) | Where approved, by the authority having jurisdiction as suitable for use as a legally required source of power, an additional service shall be permitted. This service shall be in accordance with Article 230 and the following additional requirements: Separate overhead service conductors, service drops, underground service conductors, or service laterals shall be installed.The service conductors for the separate service shall be installed sufficiently remote electrically and physically from any other service conductors to minimize the possibility of simultaneous interruption of supply. [701.12(F)](https://2023.antflix.net#701.12(F)) | https://2023.antflix.net#701.12(F) |
Chapter 7 Special Conditions | 701.12(G) | Where approved by the authority having jurisdiction, connections located ahead of and not within the same cabinet, enclosure, vertical switchgear section, or vertical switchboard section as the service disconnecting means shall be permitted. The legally required standby service shall be sufficiently separated from the normal main service disconnecting means to minimize simultaneous interruption of supply through an occurrence within the building or groups of buildings served. Informational Note: See 230.82 for equipment permitted on the supply side of a service disconnecting means. [701.12(G)](https://2023.antflix.net#701.12(G)) | https://2023.antflix.net#701.12(G) |
Chapter 7 Special Conditions | 701.12(H) | On-site sources, designated as legally required standby sources, shall be permitted to be connected to a microgrid system. The system shall isolate the legally required standby system from all nonlegally required loads when the normal electric supply is interrupted or shall meet the requirements of 701.4(C). Interruption or partial or complete failure of the normal source(s) shall not impact the availability, capacity, and duration provided by the designated legally required standby sources. The designated stored-energy legally required standby power source(s) of a microgrid system shall be permitted to remain interconnected to any available power production source during operation of the legally required standby source(s) where the lack of, or failure of, the interconnected power production source(s), or related controls, does not impact system operation. Interconnected power production sources, other than the designated SEPSS, shall not be required to meet the requirements of this article. [701.12(H)](https://2023.antflix.net#701.12(H)) | https://2023.antflix.net#701.12(H) |
Chapter 7 Special Conditions | 701.12(I) | Battery-equipped emergency luminaires used for legally required standby systems shall comply with 700.12(H). [701.12(I)](https://2023.antflix.net#701.12(I)) | https://2023.antflix.net#701.12(I) |
Chapter 7 Special Conditions | 701.30 | The branch-circuit overcurrent devices in legally required standby circuits shall be accessible to authorized persons only. [701.30](https://2023.antflix.net#701.30) | https://2023.antflix.net#701.30 |
Chapter 7 Special Conditions | 701.31 | The alternate source for legally required standby systems shall not be required to provide ground-fault protection of equipment with automatic disconnecting means. Ground-fault indication at the legally required standby source shall be provided in accordance with 701.6(D) if ground-fault protection of equipment with automatic disconnecting means is not provided. [701.31](https://2023.antflix.net#701.31) | https://2023.antflix.net#701.31 |
Chapter 7 Special Conditions | 701.32(A) | Legally required standby system(s) overcurrent protective devices (OCPDs shall be selectively coordinated with all supply-side and load-side OCPDs. Selective coordination shall be selected by a licensed professional engineer or other qualified persons engaged primarily in the design, installation, or maintenance of electrical systems. The selection shall be documented and made available to those authorized to design, install, inspect, maintain, and operate the system. [701.32(A)](https://2023.antflix.net#701.32(A)) | https://2023.antflix.net#701.32(A) |
Chapter 7 Special Conditions | 701.32(B) | Where legally required standby OCPDs are replaced, they shall be reevaluated to ensure selective coordination is maintained with all supply-side and load-side OCPDs. [701.32(B)](https://2023.antflix.net#701.32(B)) | https://2023.antflix.net#701.32(B) |
Chapter 7 Special Conditions | 701.32(C) | If modifications, additions, or deletions to the legally required standby system(s) occur, selective coordination of the legally required system(s) OCPDs with all supply-side and load-side OCPDs shall be reevaluated. Exception: Selective coordination shall not be required between two overcurrent devices located in series if no loads are connected in parallel with the downstream device. Informational Note: See Informational Note Figure 701.32(C) for an example of how legally required standby system OCPDs selectively coordinate with all supply-side OCPDs. OCPD D selectively coordinates with OCPDs C, F, E, B, and A. OCPD C selectively coordinates with OCPDs F, E, B, and A. OCPD F selectively coordinates with OCPD E. OCPD B is not required to selectively coordinate with OCPD A because OCPD B is not a legally required standby system OCPD. Informational Note Figure 701.32(C) Legally Required Standby System Selective Coordination. [701.32(C)](https://2023.antflix.net#701.32(C)) | https://2023.antflix.net#701.32(C) |
Chapter 7 Special Conditions | 702.1 | This article applies to the installation and operation of optional standby systems. The systems covered by this article consist of those that are permanently installed in their entirety, including prime movers, and those that are arranged for a connection to a premises wiring system from a portable alternate power supply. Informational Note: Optional standby systems are typically installed to provide an alternate source of electric power for such facilities as industrial and commercial buildings, farms, and residences and to serve loads such as heating and refrigeration systems, data processing and communications systems, and industrial processes that, when stopped during any power outage, could cause discomfort, serious interruption of the process, damage to the product or process, or the like. [702.1](https://2023.antflix.net#702.1) | https://2023.antflix.net#702.1 |
Chapter 7 Special Conditions | 702.2 | Reconditioned transfer switches shall not be permitted. [702.2](https://2023.antflix.net#702.2) | https://2023.antflix.net#702.2 |
Chapter 7 Special Conditions | 702.4(A)(1) | If the connection of load is manual or nonautomatic, an optional standby system shall have adequate capacity and rating for the supply of all equipment intended to be operated at one time. The user of the optional standby system shall be permitted to select the load connected to the system. Informational Note: Manual and nonautomatic transfer equipment require human intervention. [702.4(A)(1)](https://2023.antflix.net#702.4(A)(1)) | https://2023.antflix.net#702.4(A)(1) |
Chapter 7 Special Conditions | 702.4(A)(2) | If the connection of load is automatic, an optional standby system shall comply with 702.4(A)(2)(a) or (A)(2)(b) in accordance with Parts I through IV of Article 220 or by another approved method.
Full Load. The standby source shall be capable of supplying the full load that is automatically connected.
Energy Management System (EMS). Where a system is employed in accordance with 750.30 that will automatically manage the connected load, the standby source shall have a capacity sufficient to supply the maximum load that will be connected by the EMS.
[702.4(A)(2)](https://2023.antflix.net#702.4(A)(2)) | https://2023.antflix.net#702.4(A)(2) |
Chapter 7 Special Conditions | 702.5(A) | Interconnection or transfer equipment shall be required for all standby systems subject to the requirements of this article. Equipment shall be suitable for the intended use and shall be listed, designed, and installed so as to prevent the inadvertent interconnection of all sources of supply in any operation of the equipment. Exception: Temporary connection of a portable generator without transfer equipment shall be permitted where conditions of maintenance and supervision ensure that only qualified persons service the installation and where the normal supply is physically isolated by a lockable disconnecting means or by disconnection of the normal supply conductors. [702.5(A)](https://2023.antflix.net#702.5(A)) | https://2023.antflix.net#702.5(A) |
Chapter 7 Special Conditions | 702.5(B) | Transfer switches installed between the utility meter and the meter enclosure shall be listed meter-mounted transfer switches and shall be approved. Informational Note No. 1: See UL 1008M, Transfer Stritch Equipment, Meter Mounted, for more information. Informational Note No. 2: Manual and nonautomatic transfer equipment use human intervention. [702.5(B)](https://2023.antflix.net#702.5(B)) | https://2023.antflix.net#702.5(B) |
Chapter 7 Special Conditions | 702.5(C) | In other than dwelling units, the short-circuit current rating of the transfer equipment, based on the specific overcurrent protective device type and settings protecting the transfer equipment, shall be field marked on the exterior of the transfer equipment. [702.5(C)](https://2023.antflix.net#702.5(C)) | https://2023.antflix.net#702.5(C) |
Chapter 7 Special Conditions | 702.5(D) | Systems installed to permit operation in parallel with the normal source shall also meet Part I or Part II of Article 705. [702.5(D)](https://2023.antflix.net#702.5(D)) | https://2023.antflix.net#702.5(D) |
Chapter 7 Special Conditions | 702.6 | Audible and visual signal devices shall be provided, where practicable, for the following purposes specified in 702.6(A) and (B). [702.6](https://2023.antflix.net#702.6) | https://2023.antflix.net#702.6 |
Chapter 7 Special Conditions | 702.6(A) | To indicate malfunction of the optional standby source. [702.6(A)](https://2023.antflix.net#702.6(A)) | https://2023.antflix.net#702.6(A) |
Chapter 7 Special Conditions | 702.6(B) | To indicate that the optional standby source is carrying load. Exception: Signals shall not be required for portable standby power sources. [702.6(B)](https://2023.antflix.net#702.6(B)) | https://2023.antflix.net#702.6(B) |
Chapter 7 Special Conditions | 702.7(A) | A sign shall be placed at the service equipment for other than one- and two-family dwellings that indicates the type and location of each on-site optional standby power source. For one- and two-family dwelling units, a sign shall be placed at the disconnecting means required in 230.85 that indicates the location of each permanently installed on-site optional standby power source disconnect or means to shut down the prime mover as required in 445.19(C). [702.7(A)](https://2023.antflix.net#702.7(A)) | https://2023.antflix.net#702.7(A) |
Chapter 7 Special Conditions | 702.7(B) | Where removal of a grounding or bonding connection in normal power source equipment interrupts the grounding electrode conductor connection to the alternate power source(s) grounded conductor, a warning sign shall be installed at the normal power source equipment stating: WARNING: SHOCK HAZARD EXISTS IF GROUNDING ELECTRODECONDUCTOR OR BONDING JUMPER CONNECTION INTHIS EQUIPMENT IS REMOVED WHILE ALTERNATESOURCE(S) IS ENERGIZED. The warning sign(s) or label(s) shall comply with 110.21(B). [702.7(B)](https://2023.antflix.net#702.7(B)) | https://2023.antflix.net#702.7(B) |
Chapter 7 Special Conditions | 702.7(C) | Where a power inlet is used for a temporary connection to a portable generator, a warning sign shall be placed near the inlet to indicate the type of derived system that the system is capable of based on the wiring of the transfer equipment. The sign shall display one of the following warnings: WARNING: FOR CONNECTION OF A SEPARATELY DERIVED(BONDED NEUTRAL) SYSTEM ONLYorWARNING:FOR CONNECTION OF A NONSEPARATELY DERIVED(FLOATING NEUTRAL) SYSTEM ONLY [702.7(C)](https://2023.antflix.net#702.7(C)) | https://2023.antflix.net#702.7(C) |
Chapter 7 Special Conditions | 702.10 | The optional standby system wiring shall be permitted to occupy the same raceways, cables, boxes, and cabinets with other general wiring. [702.10](https://2023.antflix.net#702.10) | https://2023.antflix.net#702.10 |
Chapter 7 Special Conditions | 702.11(A) | Where a portable optional standby source is used as a separately derived system, it shall be grounded to a grounding electrode in accordance with 250.30. [702.11(A)](https://2023.antflix.net#702.11(A)) | https://2023.antflix.net#702.11(A) |
Chapter 7 Special Conditions | 702.11(B) | Where a portable optional standby source is used as a nonseparately derived system, the equipment grounding conductor shall be bonded to the system grounding electrode. [702.11(B)](https://2023.antflix.net#702.11(B)) | https://2023.antflix.net#702.11(B) |
Chapter 7 Special Conditions | 702.12(A) | Where an outdoor housed generator set is equipped with a readily accessible disconnecting means in accordance with 445.18, and the disconnecting means is located within sight of the building or structure supplied, an additional disconnecting means shall not be required where ungrounded conductors serve or pass through the building or structure. Where the generator supply conductors terminate at a disconnecting means in or on a building or structure, the disconnecting means shall meet the requirements of 225.36. [702.12(A)](https://2023.antflix.net#702.12(A)) | https://2023.antflix.net#702.12(A) |
Chapter 7 Special Conditions | 702.12(B) | Where a portable generator, rated 15 kW or less, is installed using a flanged inlet or other cord-and-plug-type connection, a disconnecting means shall not be required where ungrounded conductors serve or pass through a building or structure. The flanged inlet or other cord-and-plug-type connection shall be located outside of a building or structure. [702.12(B)](https://2023.antflix.net#702.12(B)) | https://2023.antflix.net#702.12(B) |
Chapter 7 Special Conditions | 702.12(C) | Equipment containing power inlets for the connection of a generator source shall be listed for the intended use. Systems with power inlets not rated as a disconnecting means shall be equipped with an interlocked disconnecting means. Exception: Supervised industrial installations where permanent space is identified for the portable generator located within line of sight of the power inlets shall not be required to have interlocked disconnecting means nor inlets rated as disconnects. [702.12(C)](https://2023.antflix.net#702.12(C)) | https://2023.antflix.net#702.12(C) |
Chapter 7 Special Conditions | 705.1 | This article covers installation of one or more electric power production sources operating in parallel with a primary source(s) of electricity. Informational Note No. 1: Examples of the types of primary sources include a utility supply or an on-site electric power source(s). Informational Note No. 2: See Informational Note Figure 705.1. Notes:These diagrams are intended to be a means of identification for power source components, circuits, and connections.The power source disconnect in these diagrams separates the power source from other systems.Equipment disconnecting means not shown.System grounding and equipment grounding are not shown.Custom designs occur in each configuration, and some components are optional.Informational Note Figure 705.1 Identification of Power Source Components in Common Configurations [705.1](https://2023.antflix.net#705.1) | https://2023.antflix.net#705.1 |
Chapter 7 Special Conditions | 705.5(A) | Power production sources operating in parallel with a primary source of electricity or other power production sources shall have compatible voltage, wave shape, and frequency ratings. [705.5(A)](https://2023.antflix.net#705.5(A)) | https://2023.antflix.net#705.5(A) |
Chapter 7 Special Conditions | 705.5(B) | Synchronous generators operating in parallel with a primary power source shall be installed with the required synchronizing equipment. Informational Note: See IEEE 1547, Standard for Interconnection and Interoperability of Distributed Energy Resources with Associated Electric Power Systems Interfaces, and UL 1741, Standard for Inverters, Converters, Controllers and Interconnection System Equipment for Use with Distributed Energy Resources, for utility interconnection. [705.5(B)](https://2023.antflix.net#705.5(B)) | https://2023.antflix.net#705.5(B) |
Chapter 7 Special Conditions | 705.6 | Interconnection and interactive equipment intended to connect to or operate in parallel with power production sources shall be listed for the required interactive function or be evaluated for the interactive function and have a field label applied, or both. Informational Note No. 1: See UL 1741, Standard for Inverters, Converters, Controllers and Interconnection System Equipment for Use with Distributed Energy Resources, for evaluating interconnected equipment. Sources identified as stand-alone, interactive, or multimode are specifically identified and certified to operate in these operational modes. Stand-alone sources operate in island mode, interactive sources operate in interactive mode, and multimode sources operate in either island mode or interactive mode. Stand-alone sources are not evaluated for interactive capabilities. Informational Note No. 2: An interactive function is common in equipment such as microgrid interconnect devices, power control systems, interactive inverters, synchronous engine generators, ac energy storage systems, and ac wind turbines. [705.6](https://2023.antflix.net#705.6) | https://2023.antflix.net#705.6 |
Chapter 7 Special Conditions | 705.8 | Installation of one or more electrical power production sources operating in parallel with a primary source(s) of electricity shall be performed only by qualified persons. Informational Note: See Article 100 for the definition of Qualified Person. [705.8](https://2023.antflix.net#705.8) | https://2023.antflix.net#705.8 |
Chapter 7 Special Conditions | 705.10 | Permanent plaques, labels, or directories shall be installed at each service equipment location, or at an approved readily visible location in accordance with the following: Denote the location of each power source disconnecting means for the building or structure.Exception: Installations with multiple colocated power production sources shall be permitted to be identified as a group(s). The plaque, label, or directory shall not be required to identify each power source individually.Indicate the emergency telephone numbers of any off-site entities servicing the power source systems.Informational Note: See NFPA 1-2021, Fire Code, 11.12.2.1.5 for installer information.Be marked with the wording "CAUTION: MULTIPLE SOURCES OF POWER." The marking shall comply with 110.21(B). [705.10](https://2023.antflix.net#705.10) | https://2023.antflix.net#705.10 |
Chapter 7 Special Conditions | 705.11(A) | An electric power production source shall be permitted to be connected to a service by one of the following methods: To a new service in accordance with 230.2(A)To the supply side of the service disconnecting means in accordance with 230.82(6)To an additional set of service entrance conductors in accordance with 230.40, Exception No. 5These connections shall comply with 705.11 (B) through (F). [705.11(A)](https://2023.antflix.net#705.11(A)) | https://2023.antflix.net#705.11(A) |
Chapter 7 Special Conditions | 705.11(B) | Service conductors connected to power production sources shall comply with the following: The ampacity of the service conductors connected to the power production source service disconnecting means shall not be less than the sum of the power production source maximum circuit current in 705.28(A).The service conductors connected to the power production source service disconnecting means shall be sized in accordance with 705.28 and not be smaller than 6 AWG copper or 4 AWG aluminum or copper-clad aluminum.The ampacity of any other service conductors to which the power production sources are connected shall not be less than that required in 705.11 (B). [705.11(B)](https://2023.antflix.net#705.11(B)) | https://2023.antflix.net#705.11(B) |
Chapter 7 Special Conditions | 705.11(C) | Connections to service conductors or equipment shall comply with 705.11(C)(1) through (C)(3). [705.11(C)](https://2023.antflix.net#705.11(C)) | https://2023.antflix.net#705.11(C) |
Chapter 7 Special Conditions | 705.11(C)(1) | Service conductorsplices and taps shall be made in accordance with 230.33 or 230.46 and comply with all applicable enclosure fill requirements. [705.11(C)(1)](https://2023.antflix.net#705.11(C)(1)) | https://2023.antflix.net#705.11(C)(1) |
Chapter 7 Special Conditions | 705.11(C)(2) | Any modifications to existing equipment shall be made in accordance with the manufacturer's instructions, or the modification must be field evaluated for the application and be field labeled. [705.11(C)(2)](https://2023.antflix.net#705.11(C)(2)) | https://2023.antflix.net#705.11(C)(2) |
Chapter 7 Special Conditions | 705.11(C)(3) | For meter socket enclosures or other equipment under the exclusive control of the electric utility, only connections approved by the electric utility shall be permitted. [705.11(C)(3)](https://2023.antflix.net#705.11(C)(3)) | https://2023.antflix.net#705.11(C)(3) |
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