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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.$ ^3 k1 u9 G0 t
如 fasten 兄所说, 在UL 标准的 strain relief 章节可以找到答案.
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4 T8 S+ O) G2 `! D' m- [9 v2 ] {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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' G8 y, s* `+ O r( n$ G1. UL1310 第41章节2 n, w, X/ h0 u- {4 x% N
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.; M9 m5 {& ~# H7 M2 I# A! P0 E/ n: t
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., |' R) v0 N. u" U* C# G/ l
+ ~, v; ?5 l" V7 n8 W6 }6 {2. UL697 第37章节 - 输入线 SR 吊重测试9 k" ^, W* z. \ X0 S
When 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.) i# F( f$ y1 t+ o7 ~. n1 ^7 `
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.0 G. m9 [8 z" H5 J1 \" b `# a
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3. UL697 第38章节 - 输出线 SR 吊重测试
" `% l0 y2 M4 F9 P9 U4 M/ K$ jWhen tested in accordance with 38.2, the strain relief means and the output cord shall be capable
, z8 R: ~! o- h: Xof 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 k' n; j, O8 q$ M7 b( ]
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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