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1.2.4.3! g# d( b, ^5 V
CLASS III EQUIPMENT. F, P: s& [: P& P j
equipment in which protection against electric shock relies upon supply from SELV CIRCUITS9 x" {- w6 x0 l2 b+ R
and in which HAZARDOUS VOLTAGES are not generated1 a8 E" f6 m' C: v4 ?
1.2.8.6
* ^+ W/ m! }( y# R" \& E! KHAZARDOUS VOLTAGE! U6 O" z4 ^' z$ J$ z
voltage exceeding 42,4 V peak, or 60 V d.c., existing in a circuit that does not meet the0 Z- T c6 s9 } p7 { s- _
requirements for either a LIMITED CURRENT CIRCUIT or a TNV CIRCUIT; f, a# U7 R( o- a7 n! ]
8 Q; m+ n/ c9 K3 v/ H
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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