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.
' L' K: c2 p1 D' [
2 w& r  g0 `- x" C0 Q! G131A Conductor Short Circuit and Abnormal Operation Test
0 L+ |1 `$ C; L. K131A.1 General
131A.1.1 A portable luminaire, which has a series or series/parallel string of non-replaceable lights having
* m( e& U* I, x( ~! d! rinternal 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.
Added 131A.1.1 effective February 18, 2006
131A.2 Test method – short circuit
7 }6 h7 M9 Y) |. x, q131A.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.
& C8 j/ P5 u9 t. e& N( _. MAdded 131A.2.1 effective February 18, 2006
131A.2.2 The test is to be conducted:
3 p/ C" U, r8 i6 f, y/ X: `) V, h3 pa) Until circuit interruption and resulting thermal stability occurs (usually no more than 10
) d) e/ c/ s1 F6 Q6 g% ]minutes after circuit interruption);
& }4 f6 t( V! m% b( [: B- `$ fb) 7 hours, when temperatures and current levels are being monitored and show no changes
  ^4 y1 ?& M8 e# f" Hover 3 consecutive readings, 30 minutes apart; or
/ `- b& f9 v+ O& s5 [6 ^1 f! ~% `c) 72 hours have transpired with no visual change, such as discoloration or distortion.
0 u& K) z: o1 h/ k* m- y131A.3 Test method – abnormal operation
1 n7 J, c) a# P( M131A.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.
Added 131A.3.1 effective February 18, 2006
131A.3.2 The test is to be conducted:
" |, }  D4 J9 j4 r3 B' La) Until circuit interruption and resulting thermal stability occurs (usually no more than 10
7 C2 t, L7 M$ Z! G2 _2 d# }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
2 C* t0 S0 y8 `8 F; }- Dc) 72 hours have transpired with no visual change, such as discoloration or distortion.
* F" ~$ s9 L$ X. z2 ]2 ZAdded 131A.3.2 effective February 18, 2006
# }9 y9 k) E" G+ b5 d, @. W131A.4 Test results
131A.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。