Thiết bị & Hệ thốngCâu 333 / 521
What best characterizes a Class 2 circuit?
a.Its power is limited by a listed Class 2 power source, providing protection from electric shock and fire ignition
b.It operates above 600 volts
c.It requires no overcurrent protection because it is high power
d.It is identical to a Class 1 circuit
Giải thích
A Class 2 circuit's safety comes from limiting the power available from a listed Class 2 source, which restricts both shock and fire-ignition hazards. This power limitation is why Class 2 wiring is treated differently from Class 1 and from line-voltage power circuits.
Trích dẫn luật: 2023 NEC §725.121Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
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