美国CLASS 1 CLASS 2 CLASS 3简单说明

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NFPA 70：national electric code  2002edition   725里介绍如下：
Class 1 Circuit. The portion of the wiring system between the load side of the overcurrent device or power-limited supply and the connected equipment. The voltage and power limitations of the source are in accordance with 725.21.
* m, @' u, x' d* w. R& v8 yClass 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.
4 r+ o+ K* o$ c0 R% u! M! [Class 3 Circuit.  The portion of the wiring system between the load side of a Class 3 power source and the connected equipment. Due to its power limitations, a Class 3 circuit considers safety from a fire initiation standpoint. Since higher levels of voltage and current than for Class 2 are permitted, additional safeguards are specified to provide protection from an electric shock hazard that could be encountered.
2 {) {/ ~, [5 Q! n) Z9 V7 j725.21 class 1circuit classifications and power source requirements.
- t& B; X% A- ~$ GClass 1 circuits shall be classified as either class 1 power-limited circuits where they comply with the power limitations of 725.21(A) or as class 1 remote-control and signaling circuits where they are used for remote control or signaling purposes and comply with the power limitations of 725.21(B).
(A)    class 1 power-limited circuits.  These circuits shall be supplied from a source that has a rated output of not more than 30 volts and 1000 volt-amperes.
. g1 a1 D, t0 R  s$ A( u(1)    class 1 transformers.  Transformers used to supply power-limited class 1 circuits shall comply with article 450
(2)    other class 1 power sources.  
: m+ h4 C3 Q6 [6 M) ]" p; O3 ~(B)    Cass 1 remote-control and signaling circuits.  These circuits shall not exceed 600volts the power output of the source shall not be required to be limited

bill.z

如何评价CLASS 2的ADAPTOR?请帮忙解答,我看了标准好象很范,有点难确定;

bill.z

此标准内还有哪些大家有兴趣的,请说明....