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jjlamshushushu 发表于 2014-5-30 18:05
! F! o# l. E2 a( ]9 F6 Y: nUL医疗插头,张力缓冲测试?测试规范呢? 5 C5 W: D4 O; L# B& K o2 f7 [
109 Strain Relief Tests
: w O; L/ y2 [' E& [109.1 General3 N1 F# q; i) w% A& s2 A/ I
109.1.1 After being subjected to the strain relief tests described in this section, there shall not be any1 t8 ^; ^+ s. h7 x
displacement of the conductors, conductor insulation, or outer jacket of the flexible cord exceeding 1/32
, B& Y% G! u4 @4 i: Winch (0.8 mm). There shall not be any cuts, rips, or tears in the cord insulation nor any breakage of the
9 ?( e6 K; R( n+ H, u0 Qattachment plug that could adversely affect the enclosure of live parts, strain relief, or grounding path
' _9 R8 C" U+ ?8 V# X0 Bintegrity.5 w1 R7 Y4 ?& u
109.2 Method A – Static pull
" k* |3 `: Z( p7 e1 P: o109.2.1 Each of six representative attachment plugs molded onto flexible cord, without the conductors( G/ q- k1 c9 G c) {4 H8 t- i J
terminated to the blades or grounding pin, shall be subjected to a gradually applied pull of 30 lbf (133 N)) g4 @3 ?, q; R
to the free end of the cord while the attachment plug is securely supported. The force shall be applied for
/ B4 \2 N" K4 ]6 _( ?) D1 minute in a direction perpendicular to the plane of cord entry.
4 a7 C3 G% M( U2 |% L109.3 Method B – Rotary pull
8 I1 T/ g+ H4 [' n' B$ r, p109.3.1 Each of six representative attachment plugs molded onto flexible cord, without the conductors0 i5 d. F" ]; V+ t* ?8 n- t1 w
terminated to the blades or grounding pin, shall be subjected to a rotary cord motion while a force of 10
/ Q1 Y- v2 ^$ vlbf (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
1 n f7 h7 u: a" }diameter (76 mm) circle at a point 6 inches (152 mm) below the cord exit with the attachment plug rigidly
; q* h' w% j/ D/ |mounted. (Note – This test is conveniently done with UL secureness test apparatus described in the
. E* k( K, b2 B1 }$ O- e2 |: j9 O3 MStandard for Wire Connectors and Soldering Lugs for Use With Copper Conductors, UL 486A, or in the( K# d9 \4 C5 A& w; |
Standard for Wire Connectors for Use With Aluminum Conductors, UL 486B.) |
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