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jjlamshushushu 发表于 2014-5-30 18:05 ![](static/image/common/back.gif)
6 U) ]( m' t6 n( |; [4 ?UL医疗插头,张力缓冲测试?测试规范呢? $ u. ^% W1 Y8 f3 E
109 Strain Relief Tests
5 m6 }( }' O" V) F+ D: |# g109.1 General k5 G8 q0 a1 z% T* V+ Q/ P# r5 ]
109.1.1 After being subjected to the strain relief tests described in this section, there shall not be any
3 v/ t6 }* q d! q$ N0 Rdisplacement of the conductors, conductor insulation, or outer jacket of the flexible cord exceeding 1/32# `& u0 P) p% V) q
inch (0.8 mm). There shall not be any cuts, rips, or tears in the cord insulation nor any breakage of the. R7 x! l( K& r
attachment plug that could adversely affect the enclosure of live parts, strain relief, or grounding path
/ q) e) X0 P4 A; k2 e8 uintegrity.
6 m, ?9 k" o: L9 d& N' T0 @109.2 Method A – Static pull
$ z- `2 a4 S& Y+ Z109.2.1 Each of six representative attachment plugs molded onto flexible cord, without the conductors
$ |+ @- z7 \6 e* Pterminated to the blades or grounding pin, shall be subjected to a gradually applied pull of 30 lbf (133 N)+ }, U: J: Z# r" k
to the free end of the cord while the attachment plug is securely supported. The force shall be applied for
3 _1 X& e0 p9 J2 p4 b2 s, _8 n1 minute in a direction perpendicular to the plane of cord entry.: A5 a$ a4 P/ I: S
109.3 Method B – Rotary pull0 o! K" Z9 v3 I0 c
109.3.1 Each of six representative attachment plugs molded onto flexible cord, without the conductors
6 C8 r5 Y1 D5 L4 x4 Pterminated to the blades or grounding pin, shall be subjected to a rotary cord motion while a force of 10
' v- `2 E: P" S% N& Flbf (44.5 N) is applied for 2 hours. The cord is to be rotated at a rate of approximately 9 r/min in a 3 inch
2 T* }: Y& r: N$ w6 T' Fdiameter (76 mm) circle at a point 6 inches (152 mm) below the cord exit with the attachment plug rigidly
/ a+ I! f& N- d7 R+ imounted. (Note – This test is conveniently done with UL secureness test apparatus described in the
4 u5 C9 u/ F* N" ?* N( vStandard for Wire Connectors and Soldering Lugs for Use With Copper Conductors, UL 486A, or in the+ f7 B3 ]9 ?" Z+ }" B
Standard for Wire Connectors for Use With Aluminum Conductors, UL 486B.) |
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