By Pmi Standards Committee
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Extra info for A Guide to the Project Management Body of Knowledge
This interrupt capability is specified as Amperes Interrupting Rating (AIR) and sometimes AIC. Most dc-rated, UL -Listed, branch circuit breakers that can be used in PV systems have an AIR of 5,000 amps. However, Heinemann Electric makes several with AIRs of 25,000 amps (Appendix A). Some dc-rated, UL -Recognized supplemental circuit breakers have an AIR of only 3,000 amps. Listed, dc-rated fuses normally have an AIR of up to 20,000 amps if they are of the current-limiting variety. Fuses or circuit breakers shall never be paralleled or ganged to increase currentcarrying capability unless done so by the factory and listed for such use [240-8].
BATTERIES In general, NEC Articles 480 and 690-71, 72, 73 should be followed for installations having storage batteries. 4 volts per cell, the batteries produce hydrogen gas. Even sealed batteries may vent hydrogen gas under certain conditions. This gas, if confined and not properly vented, poses an explosive hazard. The amount of gas generated is a function of the battery temperature, the voltage, the charging current, and the battery-bank size. Hydrogen is a light, small-molecule gas that is easily dissipated.
Many PV systems can use a No. 6 AWG grounding electrode conductor if that is the only connection to the grounding electrode [250-93]. Point of Connection The system grounding electrode conductor for the direct-current portion of a PV system shall be connected to the PV-output circuits toward the module-end of the circuit [690-42, 250-221. When this connection is made close to the modules, added protection from surges is afforded. Disconnect switches must not open grounded conductors [690-13]. In stand-alone PV systems, the charge controller may be considered a part of the PV-output circuit, and the point of connecting the grounding electrode conductor could be before or after the charge controller.
A Guide to the Project Management Body of Knowledge by Pmi Standards Committee