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1.2.4.3% Z: h. r" _" o7 L. K" w6 B
CLASS III EQUIPMENT- B% b) F% g; l2 ]
equipment in which protection against electric shock relies upon supply from SELV CIRCUITS
. g/ p1 S6 i. t$ fand in which HAZARDOUS VOLTAGES are not generated- T5 F$ l- Z2 N
1.2.8.6( G% }* U/ E4 A
HAZARDOUS VOLTAGE! _' u1 ]7 E6 M- M8 h. Y7 r. r$ ^+ H
voltage exceeding 42,4 V peak, or 60 V d.c., existing in a circuit that does not meet the
" B- r6 e: K! ?" xrequirements for either a LIMITED CURRENT CIRCUIT or a TNV CIRCUIT
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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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