请教美规便携式灯用导线问题

marco_you

广东安规检测
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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.

131A Conductor Short Circuit and Abnormal Operation Test
0 v2 {! P$ X" F7 \' u4 u' w0 h+ A131A.1 General
, K2 L# r  r- p7 A) c131A.1.1 A portable luminaire, which has a series or series/parallel string of non-replaceable lights having
0 @0 J2 q8 V3 ?9 ainternal conductors smaller than 18 AWG (0.82 mm2), in accordance with 27.1.5, shall be tested in
accordance with 131A.2 and 131A.3. Compliance criteria is described in 131A.4.
4 i  A3 @6 J* {3 v! U& T* `5 b/ UAdded 131A.1.1 effective February 18, 2006
131A.2 Test method – short circuit
; j) ~, {6 w+ {; ^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.
; M. x* E/ O- `+ i  K4 J9 iAdded 131A.2.1 effective February 18, 2006
) z2 u8 l" N  s  z( D" c131A.2.2 The test is to be conducted:
8 g4 Y# q+ c: O$ ca) 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
) @+ k# M8 p- Q/ d- A$ `, n/ ^0 kover 3 consecutive readings, 30 minutes apart; or
c) 72 hours have transpired with no visual change, such as discoloration or distortion.
131A.3 Test method – abnormal operation
: w# M% l; z- Q) z4 m! |# ~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.
/ l4 E4 m$ _, o! z  o8 }" \Added 131A.3.1 effective February 18, 2006
131A.3.2 The test is to be conducted:
9 S" |$ I- Z0 L2 pa) Until circuit interruption and resulting thermal stability occurs (usually no more than 10
# L+ X' V6 i! o5 {0 N* ^) _) j( rminutes after circuit interruption);
( q+ `9 e  @6 G5 `3 |1 F3 ^: qb) 7 hours, when temperatures and current levels are being monitored and show no changes
over 3 consecutive readings, 30 minutes apart; or
c) 72 hours have transpired with no visual change, such as discoloration or distortion.
2 N: O5 U# X, e% W9 D) D% H+ P" EAdded 131A.3.2 effective February 18, 2006
131A.4 Test results
% N% v6 `1 Y8 ?" \, o131A.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。