Fill in the blank. When sizing a grounded conductor (installed in a single raceway) for a service-supplied alternating current system with a grounded conductor at the service point, the grounded conductor shall not be smaller than the required __________ conductor but shall not be required to be larger than __________. This system is operating over 1,000V.
A) grounding electrode / largest ungrounded service-entrance conductor(s)
B) main bonding jumper / supply-side bonding jumper
C) system bonding jumper / main bonding jumper
D) equipment grounding / intersystem bonding jumper
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Answer: A
As outlined in Sec. 250.186(A)(1), when sizing a grounded conductor (installed in a single raceway) for a service-supplied alternating current system with a grounded conductor at the service point, the grounded conductor shall not be smaller than the required grounding electrode conductor but shall not be required to be larger than the largest ungrounded service-entrance conductor(s).
Owen is the owner and president of National Code Seminars and the holder of master electrician certifications in 46 states. He can be reached at [email protected].