305-309 REVIEW QUESTIONS AND ANSWERS WITH SOLUTIONS 2024/25

Although metal water piping alone is not permitted to serve as a grounding electrode conductor the first ____ of metal water pipe entering the building is permitted to serve as part of the grounding electrode - ANSWER 5 feet What is the smallest size wire permitted to be used as a main bonding jumper in a 1200 amp fused safety switch? The safety switch is fed from a transformer with four parallel sets of 350 Kcmil - ANSWER 4/0 Four conduits contain three 3/0 conductors for the ungrounded conductors and one 3/0 conductor for the grounding conductor. The smallest main bonding jumper that can be installed in the panel is a ____ - ANSWER 2/0 Sections 250.24A and 250.28 require which of the following to be connected together at the service entrance - ANSWER Grounded conductor, main bonding jumper, grounding electrode conductor Since section 250.32B identifies the supply conductor to a second building as a feeder or branch circuit all equipment grounding conductors are sized according to - ANSWER Table 250.122 Section 250.32B defines the grounding requirements for a grounded system supplying two or more buildings and section 250.32C defines the requirements for a _____ system - ANSWER Ungrounded A 120/208 V three phase 4 wire feeder is installed underground to serve 120 V convenience receptacles, 120 V lighting , and 208 single phase window unit AC in the parking attendance shack at park and fly. The feeder is run from a three pole breaker in a panel board that is located inside the vehicle maintenance building. One circuit will be required for the receptacles one circuit for the lighting and One circuit for the window unit. the feeder at the shack is permitted to be connected to ____. All spaces in the panel will be occupied by breakers - ANSWER A 12-circuit MB panel, a 6 circuit MLO panel, a 24-circuit MLO panel On a portable generator, the neutral conductor is required to be bonded to the frame of the generator. true or false - ANSWER True