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1.2.4.3
9 @- p9 G0 d, cCLASS III EQUIPMENT
2 h5 A3 @6 Z$ Dequipment in which protection against electric shock relies upon supply from SELV CIRCUITS4 ` G( m$ D1 ?& b2 }; C% T4 j
and in which HAZARDOUS VOLTAGES are not generated' M% T/ R5 x: J: `- |+ f, u: Z
1.2.8.6* r. D6 s. w* [
HAZARDOUS VOLTAGE; M! M+ A( P, J3 t9 ?! q" X" m
voltage exceeding 42,4 V peak, or 60 V d.c., existing in a circuit that does not meet the: I& Z4 b+ x; H! E7 L' `
requirements for either a LIMITED CURRENT CIRCUIT or a TNV CIRCUIT
L3 l6 N1 P$ g2 [3 T k
& I- p9 c8 M) H3 e% ]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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