Dịch vụ & Phân phốiCâu 4 / 521
A feeder is protected by a 100 A overcurrent device. Per Table 250.122, what is the minimum copper equipment grounding conductor (EGC)?
a.10 AWG
b.6 AWG
c.4 AWG
d.8 AWG
Giải thích
Table 250.122 requires an 8 AWG copper EGC for a 100 A overcurrent device. 10 AWG serves up to 60 A, 6 AWG is for 200 A, and 4 AWG is for 300 A.
Trích dẫn luật: 2023 NEC §250.122Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- A 200 A service uses 250 kcmil copper ungrounded service-entrance conductors. Per Table 250.66, what is the minimum copper grounding electrode conductor (GEC)?
- The GEC from a service runs only to a driven ground rod (rod/pipe electrode). What is the largest copper GEC required for this connection?
- The only grounding electrode is a concrete-encased electrode (Ufer). What is the largest copper GEC that must be run to it?
- What is the minimum copper EGC for a circuit protected by a 200 A breaker, per Table 250.122?
- What is the minimum length that a ground rod electrode must be in contact with the soil?
- A single ground rod is installed. Under what condition is a supplemental electrode NOT required?
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