本帖最后由 passagere 于 2016-5-20 20:58 编辑
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* ~' y& x# X9 k( i# ?+ _0 R" x大家好!; D F0 j& m4 A0 T6 W; e, |! | F" n
" I, w3 v& U0 @0 ]0 a: F" H9 M$ ~美规1598标准中对电击危险定义与8750的定义略有区别,8750里的电压限值为30 V rms or 42.4 V AC,60 V DC。
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- r8 r5 ?) n$ y/ I1598对电击危险的定义:# @5 R5 I; i/ Z% T! ]' c
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Risk of electric shock – in Canada and the United States, a risk of electric shock exists between any two uninsulated conductive parts of a luminaire or between an uninsulated conductive luminaire part and earth ground if the continuous current flow through a 1500 Ω resistor in parallel with a 0.15μF capacitor connected between the two points exceeds 5 mA rms (7 mA peak) and if the open circuit voltage exceeds 30 V rms or 42.4 V peak for dry, damp, and wet locations. x$ d& W- {1 J [
# A" P3 R+ f2 l) y, c9 t- Q在上面条款中,电压限值为30 V rms or 42.4 V。那直流输出的限值是否被认为是42.4V?而UL 1993标准中的此定义和UL 1598标准中的定义很相像,相关的差异为“than 30 Vrms, 42.4 Vpeak (and DC) ”。 2 V& S' R, d2 I8 d. Q6 J
- _- m2 l" a5 l4 Q5 X. \请问,在使用有class 2输出认证的电源时,如果直流电压超过42.4 V,那么用于1598适用的灯具时,电源输出端子是否被视为危险带电部件?
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谢谢!* u& E, G/ J3 \. b) k1 ?7 I6 u* A: q
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