Mạch nhánh & Đi dâyCâu 152 / 521
In a dwelling unit, the voltage between conductors supplying lampholders, luminaires, and 15- and 20-ampere receptacles must not exceed what value?
a.120 V
b.208 V
c.240 V
d.277 V
Giải thích
Section 210.6(A) limits circuits supplying lampholders and standard 15- and 20-A receptacles in dwellings to 120 V between conductors. Higher voltages such as 208, 240, and 277 V are permitted only for specific equipment and larger circuits, not general dwelling lighting and receptacle circuits.
Trích dẫn luật: 2023 NEC §210.6(A)Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- A single receptacle installed on an individual branch circuit must have an ampere rating not less than what value relative to the branch circuit?
- On a 20-ampere branch circuit supplying two or more receptacles, a single cord-and-plug-connected utilization equipment item must not have a rating exceeding what value?
- Each multiwire branch circuit must be provided with a means to simultaneously disconnect all what, at the point where the branch circuit originates?
- Under the 2023 NEC, how may a receptacle be installed to serve a kitchen countertop or work surface?
- A receptacle outlet serving a dwelling countertop must be located not more than what distance above the countertop surface?
- In a dwelling, at least one wall switch-controlled lighting outlet must be installed in which of the following?
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