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引用第4楼June.Zhao于2010-09-29 17:33发表的 :" F; k( v8 F x/ g- X$ `$ J
大侠,问问你功能绝缘跟基本绝缘的区别,说清楚了给你加分啊 我们先看看他们再标准里面的定义:
, w9 X5 Q' z; l" A' A- Z+ B1.2.9.1 FUNCTIONAL INSULATION: insulation that is necessary only for the correct functioning of the* l4 z- t% O+ p& k
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( ]' F, [5 G# @4 C5 C" o- @NOTE FUNCTIONAL INSULATION by definition does not protect against electric shock. It may, however, reduce the likelihood of ignition and
% Z1 K/ K; I( ?( N1 O6 yfire.(功能绝缘是不能防电气危险,仅仅是保证电路正常工作所需的绝缘)- o1 ~8 Y: ?" F& l. ~) X" B
1.2.9.2 BASIC INSULATION: insulation to provide basic protection against electric shock; h+ C3 q" r6 N- c
(防电气危险最基本的绝缘,也就是说在防电气危险方面,基本绝缘是最低等级的)* R* V- r2 F, t9 q
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在一个开关电源板中,保险丝后面到变压器初级之前 以及变压器次级之间这些元器件他们只要保持功能绝缘就行(保险丝两PIN脚保持功能绝缘)。+ `: S3 T, E, D( W- R+ Y9 ^6 C/ C6 g
L&N之间保持基本绝缘,如果EUT是一类设备,危险部分到金属外壳是基本绝缘,如果变压器core当中立,其中一级到core是基本绝缘
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+ h9 @& }8 S- d8 @不知道我的回答你满意不?? |
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