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5.3.1.2 For wiring which is connected to the fixed wiring via an internal current-limiting device3 d+ f9 n2 c. A* u7 V7 S# g
and limiting the current to 2 A maximum, e.g. lamp current control device, circuit cut-outs,
( u7 I; a: L5 v0 n! Hfuses, protective impedance or isolating transformers, the following is applicable:: F# B+ z% Q' `% M7 D. W# C, i
– the minimum cross-sectional area which may be less than 0,4 mm2 shall be selected in
' B. P$ Y' }- srelation to the maximum current during normal operating conditions and the time and level+ x: ~1 \+ Y9 @/ t/ x
of the current flowing during failure conditions, owing to the fact that overheating of the wire) K/ y) l& {% v5 I8 q# L5 {/ }
insulation shall be prevented under any condition;* q' V( x+ [' P
– the minimum insulation thickness, which may be less。
) c+ Z, K! A. c9 K* t& j应该属于内部线,通过隔离变压器(最后一个)连接到固定布线,所以应不小于0.4mm2。
# a! K' }4 C; }" E
, _+ y$ P( o7 Q( y# ?5 w楼主所说的是测试机构最保险的测法:
! p* L: ^" V$ }6 @; y$ v0 y# K( {5.2.2 题目 电源连接和其它外部软线
" x1 h" ?3 s1 V" l- B" f即使那个表不适用,但后面的平方数是没有专指是不可拆卸还是可拆卸软线的,所以存在争议。
1 j2 x7 P6 k; V! y5 B; h# _9 N( v
1 h$ @8 `1 ^. A K+ c# R: x如果认为外部软线适用,而不是内部线,那么是指低压三类灯具本身,才能叫外部软线,不能包括变压器。按GB7000.204标准,如果重量小于1千克,还有其它条件,那么电线也可以用到0.5mm2。 |
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