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5.3.1.2 For wiring which is connected to the fixed wiring via an internal current-limiting device4 n) m! l/ V* J7 Q; K
and limiting the current to 2 A maximum, e.g. lamp current control device, circuit cut-outs,( R6 L) \& l& ]6 B6 f9 T6 f5 }3 C
fuses, protective impedance or isolating transformers, the following is applicable:
, Z& b1 X, I1 `8 g- R– the minimum cross-sectional area which may be less than 0,4 mm2 shall be selected in8 B8 V0 i" U* ]
relation to the maximum current during normal operating conditions and the time and level
- l* n) z; O1 Z# Yof the current flowing during failure conditions, owing to the fact that overheating of the wire
1 D4 S- P N9 @6 G) ~+ c* O" q( ~insulation shall be prevented under any condition;; B4 r. _& [7 I: @ ^$ e( H
– the minimum insulation thickness, which may be less。
# {* i8 C! j) z% I' R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 V4 V4 B% I" q# s3 ^
. a6 ~0 \* M. j( H( X& o: u7 S
楼主所说的是测试机构最保险的测法:
& [, f. u5 L. ^7 a, H/ w5.2.2 题目 电源连接和其它外部软线
1 Z5 _2 o- _9 Y% n, L; 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。) Y9 K8 P }: x
) U1 S W% p$ ~8 ]$ [# k2 X- E
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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