|
|
在 power supply cord 标准UL817 和 成品标准针对 SR 的要求, 会有所区别的.
* i: v7 {% m1 U( I O' D4 h如 fasten 兄所说, 在UL 标准的 strain relief 章节可以找到答案.
7 a/ m& [2 o+ F: J) K" p
1 f; s! T# l# ]3 e+ d' K2 y% q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
, l0 p6 A& y* f# J3 q
/ M8 O0 K& @- ]' M1. UL1310 第41章节
& S) X# d. @ v K, @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.
: A1 N) n0 t( c, V- W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# k) _+ f; z( m" I2 ]( T! o( ~# v3 e) m7 h' a) n6 l
2. UL697 第37章节 - 输入线 SR 吊重测试) u) B F! w4 \1 f3 F: C
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.5 ]- I s# o6 ~0 E, i
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., u# j+ j% m2 [
( Q' |0 d, [/ l# p) V
3. UL697 第38章节 - 输出线 SR 吊重测试
+ ]& U) L% o$ J. }& HWhen tested in accordance with 38.2, the strain relief means and the output cord shall be capable) E4 q: l1 F5 B0 y" [% \
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.. c( U6 c( x; m) e7 E/ u' H: v
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. |
|
/1 
|关于安规|小黑屋|安规QQ群|Archiver|手机版|安规网
( 粤ICP13023453-10 ) 
窥视卡
雷达卡
发表于 2007-7-17 22:27
提升卡
置顶卡
沉默卡
喧嚣卡
变色卡
抢沙发
千斤顶
显身卡
楼主
发表于 2007-7-19 23:41
发表于 2007-7-22 18:28
