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NEC 2014 — Enphase System Code Compliance <br /> © 2015 Enphase Energy Inc. All rights reserved. January 20152 <br />NEC 2014 Section 705.12 Point of Connection (AC Arc-Fault <br />Protection) <br />In this section we explain how to comply with NEC 2014 Section 705.12 Point of Connection when <br />installing Enphase Energy Systems with: <br />• Supply Side Connection <br />• Load-Side Connection to Single-Phase 120/240 Volt Services <br />• Three-Phase 208/120 Volt Services <br />Supply Side Connection <br />Solution: No AC AFCI (Arc-Fault Circuit Interrupter) protection is required. <br />Code Reference <br />705.12 Point of Connection The output of an interconnected electric power source shall be <br />connected as specified in 705.12(A), (B), (C) or (D). <br />Since the operator “OR” is used to define connection types, the code seems to intend that if one criteria is <br />met, for example (A), the other criteria are not applicable. <br />Code Reference <br />705.12(A) Supply Side. An electric power production source shall be permitted to be connected <br />to the supply side of the service disconnecting means as permitted in 230.82(6). The sum of the <br />ratings of all overcurrent devices connected to power production sources shall not exceed the <br />rating of the service. <br />705.12(B) Integrated Electrical Systems. … <br />705.12(C) Greater Than 100 kW. … <br />705.12(D) Utility-Interactive Inverters. … <br />230.82(6) lists solar photovoltaic systems as eligible for equipment permitted to be connected to the <br />supply side of the service disconnecting means. Since Enphase Energy Systems are solar photovoltaic <br />systems, a supply side connection of an Enphase System may be accepted by AHJs to fully meet Code <br />section 705.12. Since 705.12(A) requirements are met, it seems logical that the 705.12(D) requirements <br />for connections to the load-side of the service disconnect means are not applicable. <br />Load-Side Connection to Single-Phase 120/240 Volt Services <br />Solution: Refer to section 90.4 and the previous code edition, NEC 2011. No listed backfeed capable AC <br />AFCI solutions or acceptable equipment to enclose the cable harness exist. Until such products are <br />generally available from manufacturers, when making load side connections, complying with NEC 2014 <br />Section 705.12 (D) (6) is achieved by discretionary guidance per NEC 2014 Section 90.4. This means to <br />refer to the previous code edition NEC 2011 Section 705.12, where AC Arc-Fault Circuit Protection is not <br />a requirement for utility-interactive inverters. <br />NEC 2014 Code Reference <br />705.12(D) Utility Interactive Inverters. The output of a utility-interactive inverter shall be <br />permitted to be connected to the load side of the service disconnecting means of the other <br />source(s) at any distribution equipment on the premises. Where distribution equipment, including <br />switchgear, switchboards, or panelboards, is fed simultaneously by a primary source(s) of <br />electricity and one or more utility-interactive inverters, and where this distribution equipment is <br />2319 N Flower <br />05/17/22