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引用第20楼anquanbiao于2008-03-03 16:58发表的 :
. s7 c% e: W% }0 l7 V+ k3 fRTI str 这个应该不需要, 应该看RTI (Elec)... UL 1446中要求替代绝缘要考虑电气的和机械的温度指数(见附文), 但是在实际的UL绝缘系统中,则不一定. 比如P LEO(E20050)的B81绝缘系统,是Class B的, 但是包含Dupont的101F这种材料. 这个怎么理解?4 ]: {; ]$ \ n
附:
+ \; H. ^' q& {. S8.5.4 An encapsulant, ground, or interwinding insulation whose principal constituents (base resin, filler,. O" u" s: }4 q: }! F" a7 {
reinforcement, flame retardant, heat stabilizer, and anti-oxidant) are found, based on documentation, to7 Q- s( c. F/ i4 B/ i4 \2 }
be identical in composition and proportion to those of an encapsulant, ground, or interwinding insulation
( p; F& K6 G2 f: g: S! x- Jpresently specified in an insulation system shall be accepted in the system without additional tests when; Z; Z( k* L) k: o$ e
both the following conditions are met:
8 F* A- R E* P$ La) The assigned relative thermal indices (electrical and mechanical) and minimum thickness of
7 w8 ?$ S" F. d xthe substitute material are equal to or greater than those of the presently specified material;
, F8 S% j$ R, v3 E" Ib) The substitute material differs from the presently specified material only with respect to3 l# p4 k. f5 ]+ j
molecular weight, lubricant, nucleating agent, anti-static agent, colorant, or particle size. |
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