本帖最后由 passagere 于 2016-5-20 20:58 编辑 / e+ z( V4 B: [6 l% o
- {" O. _0 @' f6 V3 T大家好!
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& [1 G2 }- `/ F. s/ l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。% L% c% B) o* K/ ^8 _2 n
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1598对电击危险的定义:
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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.
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. Z9 r& u- ?& P: x) X7 T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) ”。 ! _+ Z5 J) Z9 x5 D- Q/ _1 x6 ~
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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? - u/ L" b& c" S# u: Q
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