Wire-Type EGC Sizing Requirements
The National Electrical Code contains minimum requirements, which means users must do at least that much. Sometimes the Code is modified to be more restrictive and specify larger sizes of wire-type equipment grounding conductors (EGCs) due to factors that require larger than table minimums. This is a case where the specific rules in Article 430 amend the general EGC sizing requirements in Article 250, and for good reason.
1. Wire-type EGCs are not required to be larger than the size of the ungrounded circuit conductors supplying equipment.
Correct Answer: True
2. What NEC table is required to be used to establish the minimum size wire-type EGCs?
Correct Answer: Table 250.122
3. EGCs for branch circuits and feeders are required to be of which of the following types of material?
Correct Answer: All of the above
4. If the branch circuit, short-circuit and ground-fault protective device for a motor is sized at 90A, and the overload protection is sized at 30A, what is the minimum size required for a copper wire-type EGC for the motor branch circuit?
Correct Answer: 10 AWG copper
5. Branch circuit overcurrent protective devices are not required to be certified (listed) by a qualified electrical testing laboratory.
Correct Answer: False
6. Overcurrent protection for motor branch circuit conductors shall be in accordance with Section 310.14.
Correct Answer: False
7. EGCs for branch circuits or feeders are required to be increased in size if the ungrounded circuit conductors become larger for any reason other than for ambient temperature correction factors and adjustment factors for more than three current-carrying conductors in a raceway or cable.
Correct Answer: True
8. What is the minimum size EGC for a motor circuit if the motor branch-circuit, short-circuit and ground-fault protective device is sized at 1,200A?
Correct Answer: 3/0 AWG copper
9. If the ungrounded circuit conductors for a 400A circuit are increased in size from 600-kcmil copper to 800-kcmil copper due to length and excessive voltage drop, what is the minimum size required for a wire-type EGC?
Correct Answer: 1 AWG copper
10. Reconditioned motors identified for and used in hazardous (classified) locations shall be listed as reconditioned.
Correct Answer: True
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