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在 power supply cord 标准UL817 和 成品标准针对 SR 的要求, 会有所区别的./ B7 |6 t; K' {' {/ v0 x
如 fasten 兄所说, 在UL 标准的 strain relief 章节可以找到答案. 7 ?3 n* Q8 I3 ]+ H& c5 y3 F
% s. h/ `0 x* Y+ ~% ]5 \
不同的标准, 输入线和输出线, 是有区别的, 所以还是要看具体的标准. 这里列举几个标准要求, 供参考
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1. UL1310 第41章节8 b7 u2 `1 h# K9 Z4 P5 v. H' I
With internal connections disconnected, the strain relief means provided for a supply cord, or a multi-conductor output cord where the interconnection of outputs exceeds Class 2 shall withstand the force described in 41.3 applied to the cord for 1 minute without displacement or breakage of the cord or deformation of its anchoring surface.
% _, N9 _5 ~' H+ K! u请再细看标准: 输入线(35lbf 1分钟), 输出线(20lbf 1分钟), 内部连接短开, 标准说不允许有位移, UL实际控制在1mm.% s* C7 L3 R5 L# o8 U
+ g0 I8 h; q2 r: y+ N( F; h/ e/ w2. UL697 第37章节 - 输入线 SR 吊重测试
8 _" B* ?, b5 n bWhen tested in accordance with 37.2 and 37.3, the strain relief means provided on the flexible cordshall be capable of withstanding a direct pull of 35 pounds-force (156 N) applied to the cord for a period of 2 minutes without any displacement of the cord or deformation of its anchoring surface that would result in a potential risk of fire, electric shock, or injury to persons.
3 t& w; |+ [6 ^% C* d4 `0 K请再细看标准: 输入线(35lbf 2分钟), 输出线(20lbf 1分钟), 内部连接断开, 标准说不允许有位移, UL实际控制在1mm.
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3. UL697 第38章节 - 输出线 SR 吊重测试! h, a# r% j' }" E3 M. S1 x7 `" S4 t
When tested in accordance with 38.2, the strain relief means and the output cord shall be capable
' q2 O; N, W2 q; E$ [of withstanding a direct pull of 20 pounds-force (89 N) applied to the cord for a period of 1 minute without displacement or breakage of the cord or deformation of its anchoring surface.
7 l5 ^' B: M) V; d, `; [请再细看标准: 输出线(20lbf 1分钟), 内部连接断开(标准虽然没说, 都这样做), 标准说不允许有位移, UL实际控制在1mm. |
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发表于 2007-7-19 23:41
发表于 2007-7-22 18:28
