本帖最后由 passagere 于 2016-5-20 20:58 编辑
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大家好!7 E* T+ x( C, h2 Y! j8 P1 S% H
% S2 _2 a' q7 u: C" ?# p1 b) b, }/ _' 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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0 ]6 V# Z" I C5 B* ?' _, j1598对电击危险的定义:) U' F& i" I8 z1 Q& z
8 I0 j' k, A, G' t$ [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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# y0 h4 G! d6 d/ L- s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) ”。 ( o1 h, c- Z9 l( s$ V, f8 a/ l
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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? , a+ i; s; c8 v! I& t: d5 v
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