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看下标准《ul446Systems of Insulating Materials– General》应该有帮助,其中INSULATION SYSTEM定义为:
1 ^% r; u6 M9 H! ]) D# T“A unique intimate combination of two or more insulating materials used in
# d8 v o4 y# }& M# Z% [electrical equipment. One example of this is the combination of magnet wire, ground insulation, varnish,
! u9 \0 F, v: e( a3 c9 E/ G3 T. c4 hlead wire insulations, and outer wrapping of a coil. These intimate combinations are evaluated as
) W3 r/ q; |& ^6 S( Q3 P: eunique groups. When multiple groups exist, either within a given insulation system or a different: r. V- @1 o r4 i% N
insulation system, components of one unique group shall not be added to another unique group.5 m1 O! g/ U2 U2 b- _; G1 i/ X0 ^. `
However, more than one group is able to be used within a single device when at least a 3.05 mm, n# I! |. Y2 N; H% Q
(0.125 inch) air space is used to separate them. Any material or component existing outside the outer+ T1 h3 o. F% ]8 [! z
wrap of the device or not in contact with the windings is not determined to be part of the insulation
" H" c% a2 j0 wsystem.” |
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