本帖最后由 passagere 于 2016-5-20 20:58 编辑 0 r S, w5 K& D0 B' A. c
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大家好!
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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。2 P4 H+ b0 K1 V M
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/ L5 X# [2 Q. ~$ w* r1598对电击危险的定义:
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0 h* Q/ q; Y% E& ]- WRisk 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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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) ”。 4 ?7 o0 e4 W5 b, z( c' ?* D
; a; J, \5 n' x8 `6 Q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? D) z0 g) O& C* {# S; ?; u
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