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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。2 i$ L' D2 t' h5 z; ^0 @8 h N
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UL153(March 15, 2013修改):' |9 {$ Z; m2 L& ^$ a
27.1.1 A conductor of a wire or cord shall be minimum 18 AWG (0.82 mm2) except where a smaller size, [6 t$ J4 _5 W8 |5 K: ^2 S( {
is permitted in (a) – (d) below:+ q" d5 o+ C% F9 r
b) A conductor in a Class 2 circuit is permitted to be of any size. ! ^8 g- S% q8 _; V3 l) n$ h; S
. V* C, `# @7 {7 Q( w5 K) ?UL8750 (7.3.7 revised October 17, 2012):
9 Z. ^' t# s$ \9 q7.3.7 Conductors of any size are permitted when the conductors are in Class 2 or isolated LVLE circuits
& T; |/ G9 \% ?) R' g$ v( C/ B2 oonly and are physically separated from all other non-Class 2 or non-isolated LVLE circuits, such as by a
7 E: A6 ]# Y2 F- P1 {barrier or reliably fixed spacing of minimum 6.4 mm (0.25 in).- S7 @+ G d* N2 S
. A$ n6 v6 ^$ [/ q. h( q: pUL2108(15.2 revised July 15, 2010):
% s6 _( X1 }; w" K15.2 Conductors shall be 18 AWG (0.82 mm2) minimum.3 d+ n D% n& }, q1 b2 Z, M
Exception No. 2: Conductors of any size are permitted when the conductors are in Class 2 or equivalent
8 Y: p+ Y1 [" tisolated low voltage, limited energy circuits only and are physically separated from all other non-Class 2. z; a9 ^/ ?2 H6 | u( z% \
or non-isolated low voltage, limited energy circuits, such as by a barrier or reliably fixed spacing of
) N0 l# `; N3 r7 bminimum 6.4 mm (0.25 in).4 o" B' J5 L1 K5 V
UL1598 (SEPTEMBER 17, 2008)0 r3 m+ V' S# O6 _% B0 U
6.9.4 Conductors of a size smaller than 24 AWG (0.21 mm2) may be used under the following conditions:* l" ?2 s7 `1 R& A Y& p$ n
(a) the conductors are in Class 2 power limited circuits only;. k. F8 y6 D2 w; k" H8 a# ?) {' ~
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