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5.3.1.2 For wiring which is connected to the fixed wiring via an internal current-limiting device7 m' f* \6 n# ~% B) j) k: b
and limiting the current to 2 A maximum, e.g. lamp current control device, circuit cut-outs,
5 e$ b5 Y! }, d& R1 H/ Sfuses, protective impedance or isolating transformers, the following is applicable:
6 d0 {. i- Z9 H; @7 u0 j& U: i( q– the minimum cross-sectional area which may be less than 0,4 mm2 shall be selected in) h7 R$ s. n/ w& v: W
relation to the maximum current during normal operating conditions and the time and level
6 v& v! o0 j3 |3 {: D8 b5 B2 e' Mof the current flowing during failure conditions, owing to the fact that overheating of the wire/ ~3 C2 T: D. G4 W
insulation shall be prevented under any condition;2 p: A" z( L! A) Y7 u4 G% n% V8 T [
– the minimum insulation thickness, which may be less。
( a* N7 `; i" a8 ]/ V6 g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。; k" k1 v4 F T0 q; w
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楼主所说的是测试机构最保险的测法:
! Q" M7 t. u4 S" S1 m6 c5.2.2 题目 电源连接和其它外部软线
/ S* o" y0 J. x% E2 f o. r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。+ j3 `4 M ]$ ` H; U8 v
$ W4 Q: R: {( j
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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