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5.3.1.2 For wiring which is connected to the fixed wiring via an internal current-limiting device
" S2 U( w& ], s4 @8 L7 O$ L& Band limiting the current to 2 A maximum, e.g. lamp current control device, circuit cut-outs,
- U% `2 {# ]6 t& W, n; F0 |& R% h* Z: bfuses, protective impedance or isolating transformers, the following is applicable:
" s* o Q9 |9 H: ^7 t# J– the minimum cross-sectional area which may be less than 0,4 mm2 shall be selected in$ N8 z5 G/ D- o$ p
relation to the maximum current during normal operating conditions and the time and level
8 f% R) _2 [6 m7 C7 {% N/ H( k5 Jof the current flowing during failure conditions, owing to the fact that overheating of the wire
7 [" w8 U' l) G) \insulation shall be prevented under any condition;3 _8 j. V: }) M. g
– the minimum insulation thickness, which may be less。- ^6 j2 k- T6 r1 l+ b8 ^! 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。
9 M. _* N2 K3 N, z4 Q& z4 U2 c
7 l3 y4 x3 h2 q; u0 j) E- F) Q6 V: L楼主所说的是测试机构最保险的测法:
1 j5 I) c2 }9 w( U, Q+ M8 L. t% l5.2.2 题目 电源连接和其它外部软线 | e: G3 q0 i9 r& f! 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。
, A0 [/ y+ P* h$ B7 M+ F/ y) b% E( {% n! A
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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