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1.2.4.3
* @$ d) _9 d6 uCLASS III EQUIPMENT" U( I' S+ n f4 ?; d( I2 Q
equipment in which protection against electric shock relies upon supply from SELV CIRCUITS% v/ G% S. D+ V+ ?, `% r
and in which HAZARDOUS VOLTAGES are not generated
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HAZARDOUS VOLTAGE
3 |5 [% [' }4 A/ G$ T; N# Uvoltage exceeding 42,4 V peak, or 60 V d.c., existing in a circuit that does not meet the5 R1 `9 u: W. ^6 r
requirements for either a LIMITED CURRENT CIRCUIT or a TNV CIRCUIT0 n' F n. D# t7 _2 s/ h6 A
3 N. |! @5 C' J/ F4 E& I2 [$ F- O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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