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jjlamshushushu 发表于 2014-5-30 18:05 ; ~3 L2 f4 L; V
UL医疗插头,张力缓冲测试?测试规范呢? 8 k/ _* m5 ]+ w% U8 F
109 Strain Relief Tests r% v- R' z' h4 [: e1 \# [
109.1 General/ X" y- c7 w- I; S
109.1.1 After being subjected to the strain relief tests described in this section, there shall not be any
" V2 j% i, I& Z! J" d5 }+ W3 Cdisplacement of the conductors, conductor insulation, or outer jacket of the flexible cord exceeding 1/32+ r, r0 J4 Y7 {3 N V! S
inch (0.8 mm). There shall not be any cuts, rips, or tears in the cord insulation nor any breakage of the' [7 k: X/ J; g }# L( ^% k
attachment plug that could adversely affect the enclosure of live parts, strain relief, or grounding path- e, f4 O$ R' E7 L+ L
integrity.
9 n5 j% {# k/ {" A. W; {+ I) A: R109.2 Method A – Static pull
$ n2 |$ d) v7 \+ r$ F C109.2.1 Each of six representative attachment plugs molded onto flexible cord, without the conductors
& a# L ~# J8 A" F# U# I' `" pterminated to the blades or grounding pin, shall be subjected to a gradually applied pull of 30 lbf (133 N). g8 Q2 a" @ ^7 u
to the free end of the cord while the attachment plug is securely supported. The force shall be applied for
/ B; i+ Q* L1 f8 O1 I5 C# _0 I& ~1 minute in a direction perpendicular to the plane of cord entry./ r" o5 X, D4 K; Y4 Z. C0 d1 {
109.3 Method B – Rotary pull
( V( C# O' I6 w1 w, @109.3.1 Each of six representative attachment plugs molded onto flexible cord, without the conductors
1 P" U( ^3 t& x1 c, Bterminated to the blades or grounding pin, shall be subjected to a rotary cord motion while a force of 108 z; N2 ?4 z3 J9 E: ?
lbf (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; Y% |: W# C m" B, l5 G
diameter (76 mm) circle at a point 6 inches (152 mm) below the cord exit with the attachment plug rigidly: Q3 v7 J( s1 D6 I8 d$ V& u
mounted. (Note – This test is conveniently done with UL secureness test apparatus described in the0 i3 L+ o/ ~' h; ~
Standard for Wire Connectors and Soldering Lugs for Use With Copper Conductors, UL 486A, or in the) ^7 n' k% E( n1 D" R2 F
Standard for Wire Connectors for Use With Aluminum Conductors, UL 486B.) |
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