Thiết bị & Hệ thốngCâu 355 / 521
What GFCI requirement applies to an underwater pool luminaire operating above the low-voltage contact limit?
a.GFCI is never required for underwater luminaires
b.Underwater luminaires operating over the low-voltage contact limit (over 15 volts) must have GFCI protection
c.GFCI is required only for 120-volt units
d.GFCI is required only for spas, not pools
Giải thích
Section 680.23(A)(3) requires ground-fault circuit-interrupter protection for underwater luminaires supplied at more than the low-voltage contact limit (over 15 volts). This protects swimmers from shock; the requirement is not limited to 120-volt units and is not exclusive to spas.
Trích dẫn luật: 2023 NEC §680.23Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
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