标题: 请教美规便携式灯用导线问题 [打印本页] 作者: marco_you 时间: 2009-6-22 10:44 标题: 请教美规便携式灯用导线问题 美规电源线不可小于18AWG，内部线在一定条件下可以小于18AWG，请问附图内的文字如何理解？谢谢！！作者: marco_you 时间: 2009-6-22 15:05
请对UL153比较熟悉的出来指点一下，谢谢！！作者: kirk630330 时间: 2009-6-22 15:52
导线若小于18AWG者, 则可用于内部使用, 但需要被妥当的放置予安全且牢固的外壳内之方式, 并且能提供短路及不正常作工测试如测试131A所提及.4 S& \9 T/ |4 r7 o4 @4 E; ?* T
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131A Conductor Short Circuit and Abnormal Operation Test: D. Q8 ]2 q$ w7 R* t( \8 w( \3 D
131A.1 General " t$ P" e3 {! q" _0 B5 _9 q131A.1.1 A portable luminaire, which has a series or series/parallel string of non-replaceable lights having0 I) } i. h0 Y2 e, n
internal conductors smaller than 18 AWG (0.82 mm2), in accordance with 27.1.5, shall be tested in 9 L+ T+ W$ C8 p: Y0 taccordance with 131A.2 and 131A.3. Compliance criteria is described in 131A.4. - P( t) G2 ~& z% yAdded 131A.1.1 effective February 18, 2006 ; w' ]% y+ k& w6 G0 E. ]131A.2 Test method – short circuit* J \: J% f' U/ a! H
131A.2.1 For the short circuit test, three samples are to be mounted as intended, draped with : a! W! `4 a0 T/ \/ ycheesecloth, and then a short circuit condition is to be introduced to simulate a line to neutral fault. The short should be located in the farthest series string to provide the maximum lead resistance.* f# v {( j) {. D+ S. l! H
Added 131A.2.1 effective February 18, 2006, h# T: u: s( n
131A.2.2 The test is to be conducted:- |3 L! e5 H# A- V/ `; B* h
a) Until circuit interruption and resulting thermal stability occurs (usually no more than 10 % ?- M5 M. S& F& Kminutes after circuit interruption);6 \4 b( W5 {0 ]# f \3 ?
b) 7 hours, when temperatures and current levels are being monitored and show no changes; W6 t: Q- x% g* I4 D# Y0 Z0 h
over 3 consecutive readings, 30 minutes apart; or 1 [/ K- V: V+ K5 i6 G/ K. m0 R- Jc) 72 hours have transpired with no visual change, such as discoloration or distortion., O; p& I+ S4 O* \6 }. G
131A.3 Test method – abnormal operation * X+ d! W# B; o0 j1 K6 C; _4 w131A.3.1 Three samples are to be mounted as intended, draped with cheesecloth, and then a lamp is to be bypassed in the series string to simulate a shorted lamp. The bypassed lamp is to be located in the closest series string to provide the least lead resistance.: l9 u5 i+ y! `" f
Added 131A.3.1 effective February 18, 20064 h8 T6 ^5 f9 |: {* t
131A.3.2 The test is to be conducted: . h1 e+ U- I: b( za) Until circuit interruption and resulting thermal stability occurs (usually no more than 108 ]. Y- e$ f3 q; N
minutes after circuit interruption);, ?! p+ m6 A! B& R
b) 7 hours, when temperatures and current levels are being monitored and show no changes0 v* y! b( H4 X8 m
over 3 consecutive readings, 30 minutes apart; or( u( [0 \" x/ j5 `6 n7 S
c) 72 hours have transpired with no visual change, such as discoloration or distortion. # P% u. {8 u4 z; n& MAdded 131A.3.2 effective February 18, 2006. @3 q3 x7 b/ q8 K
131A.4 Test results 5 K; |) x r! j131A.4.1 Acceptable results for the short circuit and the abnormal operation tests are no ignition of the cheesecloth or polymeric作者: 一直在学习 时间: 2009-6-22 15:59
小于18AWG的线可用于灯具内多个光源的串联或串并联，光源必须不可替换的，且固定在坚固的灯罩内的，以防止电线的移动或缠绕，并且要进行导线短路测试和非正常操作测试。