Dịch vụ & Phân phốiCâu 93 / 521
As a general rule, each service drop or service lateral is permitted to supply:
a.Always two sets of service-entrance conductors
b.An unlimited number of sets
c.One set of service-entrance conductors (with specific exceptions)
d.Three sets minimum
Giải thích
Per 230.40, each service drop, overhead service, or lateral is generally permitted to supply only one set of service-entrance conductors, with defined exceptions (such as multiple occupancies with separate disconnects grouped together). The other choices misstate the general one-set rule.
Trích dẫn luật: 2023 NEC §230.40Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- Ground-fault protection of equipment is generally required for solidly grounded wye services of more than 150 V to ground but not exceeding 1000 V phase-to-phase, where the service disconnect is rated:
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