|
5.3.1.2 For wiring which is connected to the fixed wiring via an internal current-limiting device! O, u, _, o' i; ~; X$ E
and limiting the current to 2 A maximum, e.g. lamp current control device, circuit cut-outs,3 q( v, v l6 R8 Y
fuses, protective impedance or isolating transformers, the following is applicable:
) R) U; }0 I; k– the minimum cross-sectional area which may be less than 0,4 mm2 shall be selected in
: S# M( H0 s8 {1 n0 }relation to the maximum current during normal operating conditions and the time and level( q/ @/ Q3 c6 M. u
of the current flowing during failure conditions, owing to the fact that overheating of the wire9 `0 w. S& T# v$ k$ l Z; x! b
insulation shall be prevented under any condition;2 m/ k; \( Z7 |" A; P& ?7 g
– the minimum insulation thickness, which may be less。, B2 S0 }* M% M* f. m! D ?
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。4 `9 O0 F0 _( {% e t
) j+ D9 j8 I3 Z7 z5 ]8 |1 u
楼主所说的是测试机构最保险的测法:
& \- r# b1 U% L" D7 [' n5.2.2 题目 电源连接和其它外部软线; j' n9 j$ u; l, |+ B O
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。* s& g1 L/ l% B9 {: K, D
( L1 r2 _# o r* I% S* G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。 |
|