|
5.3.1.2 For wiring which is connected to the fixed wiring via an internal current-limiting device
and limiting the current to 2 A maximum, e.g. lamp current control device, circuit cut-outs,
fuses, protective impedance or isolating transformers, the following is applicable:
– the minimum cross-sectional area which may be less than 0,4 mm2 shall be selected in
relation to the maximum current during normal operating conditions and the time and level
of the current flowing during failure conditions, owing to the fact that overheating of the wire
insulation shall be prevented under any condition;
– the minimum insulation thickness, which may be less。
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。
楼主所说的是测试机构最保险的测法:
5.2.2 题目 电源连接和其它外部软线
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。
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。 |
|