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jsspace 发表于 2013-11-7 17:36
5 f9 j; n0 z1 m3 Y5 c7 X a至少18AWG,请查看第6.9章节
8 Y+ i8 r x6 K! z如果满足6.9.3, 或者6.9.4线径可减少 5 j7 p" h. C/ K
那UL153里面是不是任何线径都可以呢,我看到这样一条:3 m5 N) `( q1 K/ |; C
A conductor of a wire or cord shall be minimum 18 AWG (0.82 mm2) except where a smaller size
- C, J' k" C Y1 B( {is permitted in (a) – (d) below:( a( @; Y% q" A, Z
a) Internal wiring is permitted to be of any size provided it is adequately protected against' ~/ p4 _3 B- l `. c
overload or abnormal conditions by internal fusing and protected against mechanical damage by* `- [% S' N& D( E" |- A5 O
the enclosure, barriers, or routing.
* ~! |( ^; o( j7 @; c% V7 z: L0 cb) A conductor in a Class 2 circuit shall be minimum 24 AWG (0.21 mm2).
1 [3 v' Z5 a( T7 M- p4 T* hc) A permanently attached, completely enclosed, and maximum 6-inch (152-mm) long lead wire$ H* F: s" V6 s- A! _
for a clock motor or transformer shall be minimum 24 AWG (0.21 mm2), provided that stalling of3 I( E: K2 B# b6 y" D
the clock motor or any abnormal or overload on the transformer secondary does not result in a
" b0 d! \8 L+ G3 o( Urisk of fire.
/ M8 E" j1 W- Nd) Conductors for a series or series/parallel string of non-replaceable lights located within a, K. e0 S \8 [2 T! x8 Z6 H
rigid housing which prevents moving or flexing of the conductors are permitted to be of any( N: J& p- R# R$ }. Q! |0 O
size, provided that the portable luminaire complies with the Conductor Short Circuit and# K7 I9 j: g- Q# r7 {9 P1 z
Abnormal Operation Test, Section 131A. |
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