60335-1:8.1.4 An accessible part is not considered to be live if – the part is supplied at safety extra-low voltage, provided that ? for a.c., the peak value of the voltage does not exceed 42,4 V, ? for d.c., the voltage does not exceed 42,4 V,作者: dotzuv 时间: 2011-12-22 17:40
第8.1.4章的目的是判断那些载流部件是live part, 是不可触及的,先给出两个定义, live part 和安全特低电压
live part
conductor or conductive part intended to be energized in normal use, including a neutral
conductor but, by convention, not a PEN conductor
NOTE 1 Parts, accessible or not, complying with 8.1.4 are not considered to be live parts.
请注意这里的note 1
safety extra-low voltage
voltage not exceeding 42 V between conductors and between conductors and earth, the noload
voltage not exceeding 50 V
When safety extra-low voltage is obtained from the supply mains, it is to be through a
safety isolating transformer or a convertor with separate windings, the insulation of which
complies with double insulation or reinforced insulation requirements.
请注意这里的电压, 对于600335, 凡是没有特别说明的, 电压都是指R.M.S.值, 你比较一下8.1.4中的电压值就可以知道了,并不是所有的安全特低电压都可以触及的.