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参考 NFPA 70 National Electrical Code®
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1 s0 A1 I& K* `( N725.2 Definitions.
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: q; `" r& n, {Class 2 Circuit. The portion of the wiring system between the load side of a Class 2 power source and the connected equipment. Due to its power limitations, a Class 2 circuit considers safety from a fire initiation standpoint and provides acceptable protection from electric shock.
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* L1 U: G: j* T! I4 x: U2.3 CLASS 2 – A source having limited voltage and energy capacity. Requirements for voltage and: W I- P+ O- w! r7 O+ S
energy capacity limitations are as indicated in this standard. See the Maximum Output Voltage Test, Section 28, and the Output Current and Power Test, Section 30. |
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