Dịch vụ & Phân phốiCâu 6 / 521
What is the minimum length that a ground rod electrode must be in contact with the soil?
a.6 ft (1.8 m)
b.8 ft (2.44 m)
c.10 ft (3.0 m)
d.4 ft (1.2 m)
Giải thích
Section 250.53(G) requires that a rod be installed so at least 8 ft (2.44 m) of length is in contact with soil. The other lengths do not meet the code minimum for a driven rod electrode.
Trích dẫn luật: 2023 NEC §250.53(G)Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
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