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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.( M& X4 W0 A- r, n* h# t, W. j
如 fasten 兄所说, 在UL 标准的 strain relief 章节可以找到答案.
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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2 [8 @6 d! N- v7 H, q# x" g
V6 A4 h1 B, L* d1 `! o0 R+ k& y1. UL1310 第41章节' n9 ?( b- j' S! ^- }- d
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.
) z! Q" C0 E. ?% F4 g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.1 J1 n$ ?* B6 q' Z" q
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2. UL697 第37章节 - 输入线 SR 吊重测试
x, M2 f- i: Z- M7 b! KWhen 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.
, X* G: V. {( k2 j9 a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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' Y. F, P- f! J* O) h2 E8 V- ]- t3. UL697 第38章节 - 输出线 SR 吊重测试
& Y4 Y3 P) d+ zWhen tested in accordance with 38.2, the strain relief means and the output cord shall be capable% G0 C: ~# f8 Q, l J
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.& B$ d X o9 S
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 2007-7-17 22:27
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