Dịch vụ & Phân phốiCâu 96 / 521
Where a service has two to six service disconnects for a single service, they must be:
a.Located in separate rooms of the building
b.Grouped, unless otherwise permitted, with each marked to indicate the load served
c.Wired in series with each other
d.Spaced at least 25 ft apart
Giải thích
Per 230.72, the two to six disconnects must be grouped (except for specific separate loads like fire pumps) and each marked to indicate the load it serves. Placing them in separate rooms, spacing them widely, or wiring them in series would defeat the purpose of a single, identifiable point of disconnection.
Trích dẫn luật: 2023 NEC §230.72Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- As a general rule, each service drop or service lateral is permitted to supply:
- Six current-carrying conductors are installed in a single raceway. The ampacity adjustment factor that must be applied to each conductor is:
- A grounded (neutral) service conductor larger than 6 AWG is permitted to be identified by:
- The minimum depth of working space in front of a 208Y/120 V panelboard (0-150 V to ground, Condition 1: exposed live parts on one side, no live or grounded parts on the other) is:
- When a panelboard is used as service equipment, the main bonding jumper must be:
- Where the grounding electrode conductor connects to a concrete-encased electrode, that portion of the conductor is not required to be larger than:
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