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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)
2 B" e9 q4 {0 J# F" }6.7.3 Preparation of specimens3 g% L7 y- Z- c. r9 M2 V; Y" U$ c
6.7.3.1 If the conductor coming from the pay-off reel is bare, the conductor shall be earth-grounded prior
3 @/ m1 _; V0 Jto the insulating process.
2 B4 ~4 ]0 Z' F7 a6.7.3.2 If the conductor coming from the pay-off reel is insulated, an earth-ground connection shall be! F1 J& e x8 B( r- y! t/ r
made at either the pay-off or take-up reel. For 5.26 mm2 (10 AWG) and smaller-sized single-conductor
8 t1 e" k+ v! Ncables, an earth-ground connection shall be made at both the pay-off and the take-up reels unless the
% z. y1 z9 h: g6 e8 Cconductors have been tested for continuity and found to be of one integral length.. j+ ^0 a$ j7 s7 ^( t9 C) @
6.7.3.3 For other cable constructions, the outermost conductive components shall be earth-grounded.
$ j4 e' a2 M [2 t5 b; r# Q6.7.3.4 Each earth-ground connection shall be bonded directly to the earth ground of the spark tester. |
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