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5.3.1.2 For wiring which is connected to the fixed wiring via an internal current-limiting device
+ P/ `# n; }7 t: E& N7 a6 u( M- @and limiting the current to 2 A maximum, e.g. lamp current control device, circuit cut-outs,/ p, j0 j, x1 c
fuses, protective impedance or isolating transformers, the following is applicable:7 g& n/ @4 G* q4 Q; H; C( Z: |
– the minimum cross-sectional area which may be less than 0,4 mm2 shall be selected in& s! n8 T3 P2 i- I8 g0 F
relation to the maximum current during normal operating conditions and the time and level: F% ~+ f# ]. o1 R$ A9 L1 m
of the current flowing during failure conditions, owing to the fact that overheating of the wire+ `& n$ T+ w& A7 P9 ^
insulation shall be prevented under any condition;
9 }: b, c1 W( V8 e$ S– the minimum insulation thickness, which may be less。% y# b! h# a% V; V0 q
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。
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楼主所说的是测试机构最保险的测法:
X/ b8 f. m+ y4 G' Z& J- c7 G5.2.2 题目 电源连接和其它外部软线
9 G9 b- ?2 m# a1 t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。
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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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