Article 691 Large-Scale Photovoltaic (PV) Electric Supply Stations
Informational Note No. 1: Facilities covered by this article have specific design and safety features unique to large-scale PV facilities and are operated for the sole purpose of providing electric supply to a system operated by a regulated utility for the transfer of electric energy.
Informational Note No. 2: Section 90.2(B)(5) includes information about utility-owned properties not covered under this Code. For additional information on electric supply stations, see ANSI/IEEE C2-2017, National Electrical Safety Code.
Informational Note No. 3: See Informational Note Figure 691.1.
(1) Custom designs occur in each configuration, and some components are optional.
(2) The drawing is for informational purposes only and is not representative of all potential configurations.
Informational Note Figure 691.1 Identification of Large-Scale PV Electric Supply Station Components.
Generating Station. A plant wherein electric energy is produced by conversion from some other form of energy (e.g., chemical, nuclear, solar, wind, mechanical, or hydraulic) by means of suitable apparatus.
- Electrical circuits and equipment shall be maintained and operated only by qualified personnel.
Informational Note: Refer to NFPA 70E-2018, Standard for Electrical Safety in the Workplace, for electrical safety requirements.
- Access to PV electric supply stations shall be restricted by fencing or other adequate means in accordance with 110.31. Field-applied hazard markings shall be applied in accordance with 110.21(B).
- The connection between the PV electric supply station and the system operated by a utility for the transfer of electrical energy shall be through medium-or highvoltage switch gear, substation, switch yard, or similar methods whose sole purpose shall be to safely and effectively interconnect the two systems.
- The electrical loads within the PV electric supply station shall only be used to power auxiliary equipment for the generation of the PV power.
- Large-scale PV electric supply stations shall not be installed on buildings.
- Listing and labeling
- Be evaluated for the application and have a field label applied
- Where products complying with 691.5(1) or (2) are not available, by engineering review validating that the electrical equipment is evaluated and tested to relevant standards or industry practice
Informational Note: For information on electrical system maintenance, see NFPA 70B-2019, Recommended Practice for Electrical Equipment Maintenance. For information on written procedures and conditions of maintenance, including lockout/tagout procedures, see NFPA 70E-2018.
Buildings whose sole purpose is to house and protect supply station equipment shall not be required to comply with 690.12. Written standard operating procedures shall be available at the site detailing necessary shutdown procedures in the event of an emergency.
Informational Note: See 250.194 for fence bonding and grounding requirements enclosing substation portions of an electric supply station. Grounding requirements for other portions of electric supply station fencing are assessed based on the presence of overhead conductors, proximity to generation and distribution equipment, and associated step and touch potential.