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1.2.4.3
& K: r }+ m9 K) @# B) hCLASS III EQUIPMENT% H$ g2 Y& |) E
equipment in which protection against electric shock relies upon supply from SELV CIRCUITS B( u0 Z/ Q/ _
and in which HAZARDOUS VOLTAGES are not generated
1 }9 p4 A" R+ E/ Q$ g7 j6 p1.2.8.6
) B7 ~ n' H8 N6 i0 @0 B) \HAZARDOUS VOLTAGE+ h2 _/ ^" j5 X0 X7 E0 j! c
voltage exceeding 42,4 V peak, or 60 V d.c., existing in a circuit that does not meet the. o$ F. U: |; ?6 q
requirements for either a LIMITED CURRENT CIRCUIT or a TNV CIRCUIT
$ F3 V$ I5 S9 Z0 s, p0 l9 [+ h1 q7 [0 @5 ]4 d
我个人也是觉得定义为三类设备有点勉强,电话机里面没有产生HAZARDOUS VOLTAGE这个可以说得过去,但是电话机连接到TNV电路,而TNV电路又不一定是SELV电路;既然不一定是SELV电路,那就很难满足三类设备的定义。 |
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