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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): I* T l0 Q( r7 _2 K. m3 Z; I
6.7.3 Preparation of specimens* c+ W6 D+ R% o& Y2 H( `, ~6 m9 D
6.7.3.1 If the conductor coming from the pay-off reel is bare, the conductor shall be earth-grounded prior6 d4 X- N' O, Q8 u- i7 k) v1 a
to the insulating process.* D' g" b4 z: a2 u @6 I" u$ _/ l
6.7.3.2 If the conductor coming from the pay-off reel is insulated, an earth-ground connection shall be0 q: |$ W+ t, Q' h, P+ m4 J
made at either the pay-off or take-up reel. For 5.26 mm2 (10 AWG) and smaller-sized single-conductor: N; N' H- _- y) @- _% N' K" U
cables, an earth-ground connection shall be made at both the pay-off and the take-up reels unless the
# M( i) r* ` L# i* M6 I, o/ u6 yconductors have been tested for continuity and found to be of one integral length.9 o/ z' {! s; R- v3 p. d
6.7.3.3 For other cable constructions, the outermost conductive components shall be earth-grounded.
5 ]& S% k6 E/ b! _. K) U6.7.3.4 Each earth-ground connection shall be bonded directly to the earth ground of the spark tester. |
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