UL588 绝缘牢固测试时什么意思？

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小型摆管淋雨试验机

IPX5X6X7喷水试验机

1000L恒温恒湿箱

各种试验指现货

可程式恒温恒湿试验箱

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GB1002插头量规

IPX1-X7淋雨现货

IEC61347/UL935镇流器热试验箱

灯具防风罩

IK冲击试验机

UL498插头插座量规

VDE0620插头插座量规

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家电温升测试角

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家电125mm试验指

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IEC60335试验指甲

75.1 Cord and wires employed in a seasonal lighting product shall be secured within the attachment plug,
current tap, or cord connector such that the conductor insulation does not slip away from the terminal
, J- |1 I! u+ }, z$ Uconnections. Unless a knot in the cord or wires inside the plug or other equivalent positive means provides
security for the conductor insulation, the assembly shall be capable of withstanding the pull described in
1 L% R1 _) j0 s75.2 without detachment of the insulation from the holding means within the device, or baring of the
% B& W  v, {- v9 I/ x; y+ rconductors at the entry to the device.
" {% ^4 S: e- N7 L# Y/ n; g+ P4 Q75.2 One device is to be wired as intended with at least a 6-inch (152-mm) length of flexible cord or wires.
  r# i& P) U- O+ `The insulation on each conductor of the cord or wires is to be slit, parallel to the conductor, for a short
3 H- u! z% f9 p7 adistance at a point approximately 1 inch (25.4 mm) from its entry into the device, and all strands of the
: Y5 q# D' K" d) rconductor and the separator (if any) are to be severed at the slit portion. With the device securely held by
/ _0 [' z% P! D8 ^( O6 T2 U8 h$ A1 gits blades, a direct pull of 15 lbs (67 N) for 20 AWG (0.52 mm2) or larger conductors and 10 lbs (45 N)
+ M3 I9 g, G. r% y  v9 V- l; a. Xfor conductors smaller than 20 AWG is to be applied for 2 minutes at the free end of the cord or wires.
1 t1 \7 ?. W9 w9 m# E9 uThe pull is to be applied in a direction normal to the plane of the cord-entry hole.
! `1 J- I/ o7 r; J/ Y! h! d

5 i9 e: ^' |0 E% I9 x* ~! E" \) D为什么要把线撕开？，什么意思呀？