A Guide to the Project Management Body of Knowledge by Pmi Standards Committee

By Pmi Standards Committee

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Grounding, both equipment and system, must be carefully considered when a generator is connected to an existing system. There must be no currents flowing in the equipment-grounding conductor under any operating mode of the system. The circuit breakers or fuses that are built into the generator are not sufficient to provide NEC required protection for the conductors from the generator to the PV system. An external (branch circuit rated) overcurrent device (and possibly a disconnect) must be mounted close to the generator.

38 Fuses used to protect dc or ac branch (load) and feeder circuits must be tested and rated for that use. They must also be of different sizes and markings for each amperage and voltage group to prevent unintentional interchange [240F]. DC-rated fuses that meet the requirements of the NEC are becoming more prevalent. Figure 12 shows ULListed, dc-rated, time-delay fuses on the left that are acceptable for branch circuit use, which would include the battery fuse. Acceptable dc-rated, UL -Listed fast-acting supplementary fuses are shown on the right and can be used in the PV source circuits.

Dead front-panel boards with no exposed current-carrying conductors, terminals, or contacts are generally required. Underwriters Laboratories also establishes the standards for the internal construction of panel boards and enclosures. 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.

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