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5.3.1.2 For wiring which is connected to the fixed wiring via an internal current-limiting device
4 g! f# P8 S, yand limiting the current to 2 A maximum, e.g. lamp current control device, circuit cut-outs,
' [! q4 m! n. U. \fuses, protective impedance or isolating transformers, the following is applicable:. b9 S9 l( i6 I5 W& G
– the minimum cross-sectional area which may be less than 0,4 mm2 shall be selected in' g6 P, ~( ~4 l9 I
relation to the maximum current during normal operating conditions and the time and level9 m: G0 }! i8 S
of the current flowing during failure conditions, owing to the fact that overheating of the wire6 D; w2 `' s( Y! p, P
insulation shall be prevented under any condition;/ V3 k3 L+ z5 M1 @4 C
– the minimum insulation thickness, which may be less。* C3 J: S/ ~; U# x. u* u, 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。
5 n* I9 F @" L/ V" I4 ^& N: e5 Q' d2 j3 F0 |5 M, x
楼主所说的是测试机构最保险的测法:
4 c# ^' G9 L$ `$ B1 u2 k5 D5.2.2 题目 电源连接和其它外部软线
/ b1 ?5 F5 E0 w! l, @' g0 z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。3 R1 S! U+ c) O
% O) x6 g1 o5 b
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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