请教美规便携式灯用导线问题

marco_you

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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！！

marco_you

请对UL153比较熟悉的出来指点一下，谢谢！！

kirk630330

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 U0 ^+ ?, {7 w; n131A Conductor Short Circuit and Abnormal Operation Test
131A.1 General
1 t' d3 p  B9 z# B. s131A.1.1 A portable luminaire, which has a series or series/parallel string of non-replaceable lights having
internal conductors smaller than 18 AWG (0.82 mm2), in accordance with 27.1.5, shall be tested in
) j5 Y0 p0 n6 M3 q8 waccordance with 131A.2 and 131A.3. Compliance criteria is described in 131A.4.
" H* [' @: u) UAdded 131A.1.1 effective February 18, 2006
131A.2 Test method – short circuit
131A.2.1 For the short circuit test, three samples are to be mounted as intended, draped with
cheesecloth, 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.
8 M1 I* g+ ~6 l/ ?" `Added 131A.2.1 effective February 18, 2006
5 f# y, \2 y& l- |$ b7 o8 e  b131A.2.2 The test is to be conducted:
7 u' J, O( e/ V; s+ n; |a) Until circuit interruption and resulting thermal stability occurs (usually no more than 10
minutes after circuit interruption);
b) 7 hours, when temperatures and current levels are being monitored and show no changes
over 3 consecutive readings, 30 minutes apart; or
6 J3 n: m3 x7 ?$ B5 m; Cc) 72 hours have transpired with no visual change, such as discoloration or distortion.
131A.3 Test method – abnormal operation
131A.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.
2 v8 C& \, h5 b* eAdded 131A.3.1 effective February 18, 2006
131A.3.2 The test is to be conducted:
a) Until circuit interruption and resulting thermal stability occurs (usually no more than 10
  H2 o- G& v% T6 F. _( r# ]1 eminutes after circuit interruption);
; F  s; X$ G' h) G! ?! Zb) 7 hours, when temperatures and current levels are being monitored and show no changes
& m6 G. R8 F4 K' `over 3 consecutive readings, 30 minutes apart; or
& y: s# t' C1 i9 d- C7 }c) 72 hours have transpired with no visual change, such as discoloration or distortion.
Added 131A.3.2 effective February 18, 2006
  u3 ?  `8 p7 u* G1 M. O) y131A.4 Test results
/ V( g/ a* h/ U/ y& A. q131A.4.1 Acceptable results for the short circuit and the abnormal operation tests are no ignition of the cheesecloth or polymeric

一直在学习

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。