Dịch vụ & Phân phốiCâu 11 / 521
Ungrounded conductors are increased in size for voltage drop. What must happen to the equipment grounding conductor?
a.It stays the same as Table 250.122
b.It is increased to match the neutral
c.It is increased proportionally to the ungrounded conductor's increase in area
d.No EGC is required
Giải thích
Per 250.122(B), when ungrounded conductors are upsized (e.g., for voltage drop), the EGC must be increased proportionally by the same ratio in circular-mil area. It cannot simply remain at the base Table 250.122 size, and it is never matched to the neutral.
Trích dẫn luật: 2023 NEC §250.122(B)Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
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