本帖最后由 passagere 于 2016-5-20 20:58 编辑 ' ?; Q8 G- s" D. M; w6 _0 d
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~3 U" u7 c# b: n0 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。
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* f5 ~; f. t5 S/ c% X1598对电击危险的定义:
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p- s# D) h6 tRisk 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. 2 p0 `: ?4 B+ t, L3 g
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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) ”。
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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?
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谢谢!. L1 d. }5 Z7 v
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