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本帖最后由 依然 于 2013-6-24 10:52 编辑 ) U) |9 J7 V0 x+ G$ D. C& p* Q
9 U3 x7 {: `* e: t/ \/ o对于class 2后面的电线,其实UL已经允许任何线径的电线使用了,大部分灯具标准中都已经做了修改。
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UL153(March 15, 2013修改): x, }4 g: W3 }
27.1.1 A conductor of a wire or cord shall be minimum 18 AWG (0.82 mm2) except where a smaller size
( s, f/ N' k+ w! p4 A* z0 Kis permitted in (a) – (d) below:
3 P O% F1 L c9 b! Wb) A conductor in a Class 2 circuit is permitted to be of any size. 9 B: d2 P: Z: {3 f/ D5 Z/ \
6 t. E6 `) L. ]* T1 wUL8750 (7.3.7 revised October 17, 2012):
4 T% j2 c6 S) Y! f4 T5 B7.3.7 Conductors of any size are permitted when the conductors are in Class 2 or isolated LVLE circuits
+ }* s! W8 P7 Wonly and are physically separated from all other non-Class 2 or non-isolated LVLE circuits, such as by a5 g8 W5 r, ^7 x* M. y
barrier or reliably fixed spacing of minimum 6.4 mm (0.25 in).
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* j9 \& J8 P* gUL2108(15.2 revised July 15, 2010):1 \/ [3 f. j, Q) o
15.2 Conductors shall be 18 AWG (0.82 mm2) minimum.
+ p/ K, }; E, ^7 o9 |4 D2 bException No. 2: Conductors of any size are permitted when the conductors are in Class 2 or equivalent
7 Q* O5 \, P/ ]) w: V# Jisolated low voltage, limited energy circuits only and are physically separated from all other non-Class 2/ i" U# U& d, S3 ]9 \% V7 ?
or non-isolated low voltage, limited energy circuits, such as by a barrier or reliably fixed spacing of X( B" @- E% {$ F/ r
minimum 6.4 mm (0.25 in). V1 P. ]& M- W4 J) L% l
UL1598 (SEPTEMBER 17, 2008) m. n: } C& ?" F+ b; t
6.9.4 Conductors of a size smaller than 24 AWG (0.21 mm2) may be used under the following conditions:
4 U% b4 x i1 A ?9 G- k8 I(a) the conductors are in Class 2 power limited circuits only;# B7 c/ L5 o1 M
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