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引用第3楼依然于2008-07-15 16:12发表的 :
' `3 h( Z5 H6 d {8 S就是说把一个直插式的输出为安全低电压(class2)的变压器插到一个120V或240V的系统电源(也就是用户电源)。对于线上连接式的输出为安全低电压(class2)的变压器,则接到150V以内的电源上。 这几天在看这个标准.有个疑问1 e; [( ~) t# K3 u' I
标准上的有的原话是
, A- G: x5 {8 }1 H2 K$ i) b* bThese requirements cover indoor and outdoor use Class 2 power supplies and battery chargers6 m# V' b5 t+ |' g2 o
intended for use on alternating current branch circuits with a maximum potential of 150 V to ground. These requirements apply to:8 e9 O1 e) a$ H* O
a) Portable and semipermanent mounted direct plug-in units provided with 15 A blade' m: V# b3 [4 i/ h9 g. k/ @
configurations for use on nominal 120 or 240 V branch circuits;+ ^0 D9 T+ b9 L# e9 ?. V( X' J
b) Cord- and plug-connected units provided with a 15 or 20 A attachment plug configuration;3 `+ n7 O7 f6 _! X; B, ?
and
/ }6 g* e, O7 E; \) Vc) Units permanently connected to the input supply.没有说明如果是线上连接式或者永久连接方式的产品就不能拉入超过150V电压以上电源中了. |
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