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对于火花测试,UL 2556中有要求,会涉及到接地问题(包括收放线,火花机)
+ v* ]- Y% t7 E6.7.3 Preparation of specimens) {* V# U/ e1 P1 R0 S) D! f7 n
6.7.3.1 If the conductor coming from the pay-off reel is bare, the conductor shall be earth-grounded prior: I* B7 Y5 m$ @
to the insulating process.0 p) E% G' d8 R5 J/ u- [1 b {& O
6.7.3.2 If the conductor coming from the pay-off reel is insulated, an earth-ground connection shall be' A _* k( F: ~% g9 w& w7 b+ N
made at either the pay-off or take-up reel. For 5.26 mm2 (10 AWG) and smaller-sized single-conductor
: T. G" M# _7 z8 x# w2 Ocables, an earth-ground connection shall be made at both the pay-off and the take-up reels unless the
: @. a2 k$ l' A0 Y* O0 D: [conductors have been tested for continuity and found to be of one integral length.
- l. v! l# N% Q6.7.3.3 For other cable constructions, the outermost conductive components shall be earth-grounded.
( n0 P3 v3 u/ {" n& A# _6.7.3.4 Each earth-ground connection shall be bonded directly to the earth ground of the spark tester. |
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