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！！

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。

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.
( m9 a& i5 D2 ^" Q
131A Conductor Short Circuit and Abnormal Operation Test
9 ^7 @% d/ F6 e( i3 A1 a  r& u6 _131A.1 General
; B* z* V9 [) H6 l0 Q% |131A.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
! h8 P6 z( R, m6 s$ n& Faccordance with 131A.2 and 131A.3. Compliance criteria is described in 131A.4.
Added 131A.1.1 effective February 18, 2006
* D6 Y! V! c" j' y' ^131A.2 Test method – short circuit
; c2 P7 E2 V7 `. D! r" D131A.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.
, |! B# R# O7 b& S/ X8 @' D$ {Added 131A.2.1 effective February 18, 2006
7 p0 s. k) V, O" O  P131A.2.2 The test is to be conducted:
a) Until circuit interruption and resulting thermal stability occurs (usually no more than 10
minutes after circuit interruption);
6 Z5 R5 ?  i$ g. W4 @) D1 O" |b) 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.
7 \5 \: I3 z  o0 C( h2 J- W" y131A.3 Test method – abnormal operation
: L2 }" ^& Y6 w0 B$ Y) m. A131A.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.
9 I$ \4 T: p2 w6 f8 |Added 131A.3.1 effective February 18, 2006
3 e! w+ i( [0 n; d131A.3.2 The test is to be conducted:
+ ^: I, R( q' g0 ja) Until circuit interruption and resulting thermal stability occurs (usually no more than 10
/ w; n9 D5 G2 g1 i; R4 x/ B. N: f$ N5 @minutes after circuit interruption);
" s' e1 c6 @, ~' mb) 7 hours, when temperatures and current levels are being monitored and show no changes
; p% H: S* d# {6 e) X& y- I7 v- fover 3 consecutive readings, 30 minutes apart; or
" d: \  |- P) D4 P& }2 b- x+ {c) 72 hours have transpired with no visual change, such as discoloration or distortion.
Added 131A.3.2 effective February 18, 2006
131A.4 Test results
' N1 x1 y9 J# N131A.4.1 Acceptable results for the short circuit and the abnormal operation tests are no ignition of the cheesecloth or polymeric

marco_you

请对UL153比较熟悉的出来指点一下，谢谢！！