本帖最后由 passagere 于 2016-5-20 20:58 编辑
: H2 b H% e2 Z) r1 W$ D* h& ~4 }
大家好!
. p1 R1 Z% S3 t3 j$ w& q' y& c# @$ ^# ?) u9 m( ~' 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。
/ E/ c! j N0 Q& U6 g/ K5 Q# U: e+ ?* U/ z
" K& G5 F1 L* e- C8 K1598对电击危险的定义:. e' p. j" l" V. m' V3 \
* P- t0 O0 k! F) }* p) LRisk 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. ; y0 r# ~$ _, @& f d
4 u3 n( w. @! P$ ]3 W1 V+ p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) ”。
: q- N' z9 U5 C9 `4 j) H: i* u, d7 o- h" r1 W# g5 l
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? 2 g' h( h* n: K! {) x6 D& ]7 ^
+ ]* q8 P1 i1 a
谢谢!! }& o6 W( c% a$ z
|