ORD 1869 - Laserfiche WebLink

(A) Circuits and Equipment. Photovoltaic source circuit, photovoltaic output circuit, inverter output circuit, and storage battery circuit conductors and equipment shall be protected in accordance with the requirements of Article 240. Circuits connected to more than one electrical source shall have over current devices located so as to provide over current protection from all sources. Exception: An over current device shall not be required for circuit conductors sized in accordance with 690.8(B) and located where one of the following apply: (a) There are no extemal sources such as parallel- connected source circuits, batteries, or back feed from inverters. (b) The short-circuit currents from all sources do not exceed the ampacity of the conductors. FPN: Possible back feed of current from any source of supply, including a supply through an inverter into the pho- tovoltaic output circuit and photovoltaic source circuits, is a consideration in determining whether adequate over current protection from all sources is provided for conductors and modules. (B) Power Transformers. Over current protection for a transformer with a source(s) on each side shall be provided in accordance with 450.3 by considering first one side of the transformer, then the other side of the transformer, as the primary. Exception: A power transformer with a current rating on the side connected toward the photovoltaic power source not less than the short-circuit output current rating of the inverter shall be permitted without over current protection from that source. (C) Photovoltaic Source Circuits. Branch-circuit or supplementary-type over current devices shall be permitted to provide over current protection in photovoltaic source circuits. The over current devices shall be accessible but shall not be required to be readily accessible. 71