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5.3.1.2 For wiring which is connected to the fixed wiring via an internal current-limiting device
# P0 K, q$ h7 P! L5 j _( R' [5 ?and limiting the current to 2 A maximum, e.g. lamp current control device, circuit cut-outs,
. Y( @1 E. j) a5 \* tfuses, protective impedance or isolating transformers, the following is applicable:$ l6 j. T2 a9 K5 C& m
– the minimum cross-sectional area which may be less than 0,4 mm2 shall be selected in" D# _* }0 e. i; O6 o: _
relation to the maximum current during normal operating conditions and the time and level: _$ Z, a4 T% ]& f9 h
of the current flowing during failure conditions, owing to the fact that overheating of the wire
5 O6 P0 E$ ^( r6 h& Cinsulation shall be prevented under any condition;
: J3 i7 o1 ?: |3 `# X- M& T1 Y– the minimum insulation thickness, which may be less。0 Q3 n& R+ L' U& E( H2 e" ]
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。: Z! P. c: ^$ c$ D: [3 @
}+ j9 s; I. ` }) |- \( M3 b3 }楼主所说的是测试机构最保险的测法:
; }2 B4 x8 G: p0 A" n4 Z5.2.2 题目 电源连接和其它外部软线
; b( _+ g* A d$ Q! b8 x* L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。: d5 C/ C2 O/ H- [1 d! A9 n
9 I# f: Z h3 g/ H; ?6 x
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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