ELECTRICAL WIRING:RESIDENTAL-6 PLANS
ELECTRICAL WIRING:RESIDENTAL-6 PLANS
18th Edition
ISBN: 9781305098329
Author: MULLIN
Publisher: CENGAGE L
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Chapter 27, Problem 11R

What is the minimum size copper grounding electrode conductor for each of the following residential electrical services? Refer to Table 250.66. The ungrounded conductors are Type THW copper.

Chapter 27, Problem 11R, What is the minimum size copper grounding electrode conductor for each of the following residential

310.15(B)(7) is only for 120/240-volt, single-phase residential services and feeders. This Section does not apply to services and feeders other than residential.

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A? Conductor is defined in NEC 240.2 as a conductor, other than a service conductor, having overcurrent protection ahead of its point of supply that exceeds the value permitted for similar conductors that are not taps. A. Faulted b. Tap c. Magnetic d. Copper-like
h.1. In an alternating-current system, the maximum size for a copper grounding electrode conductor isA. 250 kcmil.B. 3/0.C. 500 kcmil.D. 4/0. h.2. The figure shows a fault condition in an ungrounded electrical system. Which of the following will occurbecause of the fault in this system?A. Only the overcurrent protector at Point A will trip open.B. The ground fault will heavily damage the service.C. Nothing will happen until a second ground fault occurs.D. The overcurrent protection will trip, shutting off all the line side power.
10. Main bonding jumpers are required to be made of _______ or other corrosion-resistant material.A. copperB. aluminumC. copper-clad aluminum

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