Services, Grounding & BondingCâu 35 / 120
What is the minimum size copper equipment grounding conductor for a circuit protected at 60 amperes?
a.10 AWG
b.12 AWG
c.8 AWG
d.6 AWG
Giải thích
Table 250.122 is entered by the rating of the overcurrent device ahead of the circuit, and the 60-ampere row calls for 10 AWG copper. 12 AWG is listed for 20 amperes, 8 AWG for 100 amperes, and 6 AWG for 200 amperes, so all three are the wrong rows.
Trích dẫn luật: 2023 NEC Table 250.122Luyện miễn phí toàn bộ 120 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- A service is supplied by two parallel sets of 250 kcmil copper conductors per phase. What is the minimum size copper grounding electrode conductor?
- Where the grounding electrode conductor connects only to a driven ground rod, what is the largest size it is required to be?
- Where the grounding electrode conductor connects only to a concrete-encased electrode, what is the largest size it is required to be?
- A 200-ampere feeder requires what minimum size copper equipment grounding conductor?
- What is the minimum size copper equipment grounding conductor for a 400-ampere feeder?
- A 100-ampere feeder originally sized with 3 AWG copper (52,620 circular mils) is upsized to 1/0 AWG copper (105,600 circular mils) for voltage drop. What is the minimum equipment grounding conductor?
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