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本帖最后由 依然 于 2013-6-24 10:52 编辑
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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。( e, z" ~& Z' G8 n: l
: M3 k/ m- q; J8 E- {UL153(March 15, 2013修改):* A& g' o7 y9 B& @: R
27.1.1 A conductor of a wire or cord shall be minimum 18 AWG (0.82 mm2) except where a smaller size
5 q; P% A; M# I% }, j5 B P2 j( eis permitted in (a) – (d) below:: K+ y" l* `# u1 B$ D, Y' T
b) A conductor in a Class 2 circuit is permitted to be of any size. . c l# a7 S- k; t
0 w5 F, V" U& R' y( sUL8750 (7.3.7 revised October 17, 2012):
0 a; M% Q$ g/ d- u5 o7.3.7 Conductors of any size are permitted when the conductors are in Class 2 or isolated LVLE circuits
: w- t, l' \% m+ \only and are physically separated from all other non-Class 2 or non-isolated LVLE circuits, such as by a
+ D3 U2 v& n: s5 Rbarrier or reliably fixed spacing of minimum 6.4 mm (0.25 in).
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! L( u# T; \: t+ K7 DUL2108(15.2 revised July 15, 2010):
. w4 w5 ` o5 q2 T! s7 g. W. ^15.2 Conductors shall be 18 AWG (0.82 mm2) minimum.; ~5 ?: Z2 s+ `. O7 N" |
Exception No. 2: Conductors of any size are permitted when the conductors are in Class 2 or equivalent. W& I& s+ U& o/ g- S6 _- V" q P
isolated low voltage, limited energy circuits only and are physically separated from all other non-Class 2( T& c6 v7 u& C
or non-isolated low voltage, limited energy circuits, such as by a barrier or reliably fixed spacing of
3 N1 ^) U- x C: h' q0 wminimum 6.4 mm (0.25 in).+ k8 F: E0 W$ W2 Y/ V
UL1598 (SEPTEMBER 17, 2008)2 Z* ? C" K( T1 f8 O
6.9.4 Conductors of a size smaller than 24 AWG (0.21 mm2) may be used under the following conditions:
9 P/ c2 F6 c3 Q4 i5 t(a) the conductors are in Class 2 power limited circuits only; ~* H V% Y H# I2 c
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