|
5.3.1.2 For wiring which is connected to the fixed wiring via an internal current-limiting device) s$ X4 ]7 V- p
and limiting the current to 2 A maximum, e.g. lamp current control device, circuit cut-outs,
1 F/ ?$ b4 J6 `# ffuses, protective impedance or isolating transformers, the following is applicable:
, s/ {$ B. a. ?3 x: U- v– the minimum cross-sectional area which may be less than 0,4 mm2 shall be selected in
& O: k/ R5 J O5 }& P# i+ [relation to the maximum current during normal operating conditions and the time and level. d! ?8 e1 F# N
of the current flowing during failure conditions, owing to the fact that overheating of the wire2 p9 ]& H7 }1 ~
insulation shall be prevented under any condition;
) K! O% p* V+ M) p' i9 K4 k– the minimum insulation thickness, which may be less。 d" j9 K7 s9 C$ g0 y
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。# r! T! U' n/ t" B, S- g+ ^
1 A7 H# _1 b: E, i5 F I d# U
楼主所说的是测试机构最保险的测法:- Q0 N7 v7 ]. Q! m D
5.2.2 题目 电源连接和其它外部软线
0 O j C4 N. K, {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。- O* B$ i3 i9 c3 y# H5 \) G
( e% S. X2 Y% h) g! P5 J- P- ?4 F+ \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。 |
|