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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)/ i8 A* U& |0 B: X6 \
6.7.3 Preparation of specimens
6 i0 P* o& [/ r# b) k- z6 e9 z6.7.3.1 If the conductor coming from the pay-off reel is bare, the conductor shall be earth-grounded prior( x. E6 w4 o' ~
to the insulating process.
/ ~# O6 v" x4 X6 u' x& K6.7.3.2 If the conductor coming from the pay-off reel is insulated, an earth-ground connection shall be
0 h% c5 b8 z; f: s" k* tmade at either the pay-off or take-up reel. For 5.26 mm2 (10 AWG) and smaller-sized single-conductor8 F: W, f) r4 f4 Y D* [
cables, an earth-ground connection shall be made at both the pay-off and the take-up reels unless the3 m0 W* M1 S1 M. T1 i
conductors have been tested for continuity and found to be of one integral length.
5 x; g' Q! S% i# N1 I0 k; r: W, P6.7.3.3 For other cable constructions, the outermost conductive components shall be earth-grounded.- h/ {0 I- @( C% k. 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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