Thiết bị & Hệ thốngCâu 344 / 521
How does a Class 3 circuit differ from a Class 2 circuit?
a.Class 3 is always lower power than Class 2
b.Class 2 and Class 3 are identical
c.Class 3 circuits are permitted at higher voltage and power than Class 2 and require additional protection against shock
d.Class 3 is a line-voltage power circuit
Giải thích
Class 3 power sources are allowed to supply higher voltage and power levels than Class 2, so Article 725 imposes additional requirements to protect against electric shock. Class 3 is still a limited-energy circuit, not a general line-voltage power circuit.
Trích dẫn luật: 2023 NEC §725.121Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
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