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参考 NFPA 70 National Electrical Code® 3 H9 K- I4 E( H2 q
5 K7 o3 ]6 [% I4 r: _1 t; z/ ~725.2 Definitions.; O" `1 d/ Y& t0 Z7 B
e% m: j$ f3 H$ m I( CClass 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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UL13100 T" R! N) t M0 z( Y o
2.3 CLASS 2 – A source having limited voltage and energy capacity. Requirements for voltage and
1 H" e, R$ q9 G Q* f- \; m) v4 H# {9 `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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