Thiết bị & Hệ thốngCâu 314 / 521
The top of a wet-niche underwater pool luminaire lens (other than a listed low-voltage unit) must be installed at least how far below the normal water level?
a.6 inches
b.12 inches
c.24 inches
d.18 inches
Giải thích
Section 680.23(A)(5) requires the top of a wet-niche luminaire lens to be at least 18 inches below the normal water level. Listed low-voltage luminaires with no exposed metal parts may be as little as 4 inches below the surface, but the general rule is 18 inches.
Trích dẫn luật: 2023 NEC §680.23Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- Under the 2023 NEC, what unit load is used to calculate the general lighting load for a dwelling unit?
- A luminaire installed in a wet location must be marked with what designation?
- Cord-connected luminaires, hanging luminaires, and similar equipment shall not have parts located within what zone measured from the bathtub rim or shower threshold, unless marked for damp or wet locations?
- What is the maximum voltage permitted for a wet-niche underwater pool luminaire?
- How must the wiring of an emergency system generally be arranged relative to all other wiring?
- Transfer equipment used for an emergency system must be what?
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