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1.2.4.3
; W* q. u6 }1 b# m+ w1 S4 uCLASS III EQUIPMENT
, O+ G/ A- Z' @8 F# }4 ^! t& s* @equipment in which protection against electric shock relies upon supply from SELV CIRCUITS5 o. \" ]. R# z! H2 w
and in which HAZARDOUS VOLTAGES are not generated
8 i! z# C* @# g# P4 q/ R1.2.8.6/ C/ F! c4 c9 \2 e
HAZARDOUS VOLTAGE5 h' o. ~1 F0 K* z9 K l
voltage exceeding 42,4 V peak, or 60 V d.c., existing in a circuit that does not meet the
3 c& O; d9 h: J$ O7 R. q% \# Srequirements for either a LIMITED CURRENT CIRCUIT or a TNV CIRCUIT! c! t% v' @' T0 C
0 I( {% p$ k% \# ]/ V5 X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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