INTERCONNECTED ELECTRIC

POWER PRODUCTION SOURCES 705-1. Scope. This article covers installation of one or more electric power production sources operating in parallel with a primary source(s) of electricity. (FPN): The primary source may be a utility supply, on-site electric power source(s), or other sources. 705-2. Definition. For purposes of this article, the following definition applies: Interactive System: An electric power production system that is operating in parallel with and capable of delivering energy to an electric primary source supply system. 705-3. Other Articles. Interconnected electric power production sources shall comply with this article and also the applicable requirements of the following articles: Article 445 Generators 690 Solar Photovoltaic Systems 700 Emergency Systems 701 Legally Required Standby Systems 702 Optional Standby Systems 705-10. Directory. A permanent plaque or directory, denoting all electrical power sources on or in the premises, shall be installed at each service equipment location and at locations of all electric power production sources capable of being interconnected. Exception: Installations with large numbers of power production sources shall be permitted to be designated by groups. 705-12. Point of Connection. The outputs of electric power production systems shall be interconnected at the premises service disconnecting means. See Section 230-82, Exception No. 6. Exception No. 1: The outputs shall be permitted to be interconnected at a point or points elsewhere on the premises where the system qualifies as an integrated electric system and incorporates protective equipment in accordance with all applicable sections of Article 685. Exception No. 2: The outputs shall be permitted to be interconnected at a point or points elsewhere on the premises where all of the following conditions are met: a. The aggregate of nonutility sources of electricity has a capacity in excess of 100 kW, or the service is above 1000 volts; b. The conditions of maintenance and supervision assure that qualified persons will service and operate the system; and C. Safeguards and protective equipment are established and maintained. 70-736 NATIONAL ELECTRICAL CODE 705-14. Output Characteristics. The output of a generator or other electric power production source operating in parallel with an electric supply system shall be compatible with the voltage, wave shape, and frequency of the system to which it is connected. (FPN): The term compatible does not necessarily mean matching the primary source wave shape. 705-16. Interrupting and Withstand Rating. Consideration shall be given to the contribution of fault currents from all interconnected power sources for the interrupting and withstand ratings of equipment on interactive systems. 705-20. Disconnecting Means, Sources. Means shall be provided to disconnect all ungrounded conductors of an electric power production source(s) from all other conductors. See Article 230. 705-21. Disconnecting Means, Equipment. Means shall be provided to disconnect equipment, such as inverters or transformers, associated with a power production source, from all ungrounded conductors of all sources of supply. Exception: Equipment intended to be operated and maintained as an integral part of a power production source exceeding 1000 volts. 705-22. Disconnect Device. The disconnecting means for ungrounded conductors shall consist of a manually or power operable switch(es) or circuit breaker(s): (1) Located where accessible; (2) Externally operable without exposing the operator to contact with live parts and, if power operable, of a type that can be opened by hand in the event of a power supply failure; (3) Plainly indicating whether in the open or closed position; and (4) Having ratings not less than the load to be carried and the fault current to be interrupted. For disconnect equipment energized from both sides, a marking shall be energized. provided to indicate that all contacts of the disconnect equipment may be (FPN No. 1): In parallel generation systems, some equipment, including knife blade switches and fuses, may be energized from both directions. See Section 240-40. (FPN No. 2): Interconnection to off-premises primary source may require a visibly verifiable disconnecting device. 705-30. Overcurrent Protection. Conductors shall be protected in accordance with Article 240. Equipment overcurrent protection shall be in accordance with the articles referenced in Article 240. Equipment and conductors connected to more than one electrical source shall have a sufficient number of overcurrent devices so located as to provide protection from all sources.