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5.3.1.2 For wiring which is connected to the fixed wiring via an internal current-limiting device
& L& ?! @- [6 r9 \and limiting the current to 2 A maximum, e.g. lamp current control device, circuit cut-outs,6 o8 S! J& @$ I. v% V8 y
fuses, protective impedance or isolating transformers, the following is applicable:% B: z& `7 ?6 F3 |9 [' M. V0 {
– the minimum cross-sectional area which may be less than 0,4 mm2 shall be selected in
( H% T. O. t' e6 [5 Irelation to the maximum current during normal operating conditions and the time and level2 Q; o1 H6 r- V4 R$ ~& q1 ^5 S
of the current flowing during failure conditions, owing to the fact that overheating of the wire+ d% U8 _% a# V' H# t! B$ m
insulation shall be prevented under any condition;0 g/ _, `1 o5 g# U2 q
– the minimum insulation thickness, which may be less。5 n& {" Q {; Y+ m. 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。7 @0 p( e6 i- C4 B- V; m
- |3 o% k1 E( i/ W0 H) }
楼主所说的是测试机构最保险的测法:: i- [; d4 e8 C, s! C
5.2.2 题目 电源连接和其它外部软线
' q5 n7 W5 g8 Y+ k) c! }& X# 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。; k, ~1 a0 W3 q4 s4 z
6 H- y" @$ Z ]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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