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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:
" `7 w) s' x' b“A unique intimate combination of two or more insulating materials used in
7 J1 y* z& P5 V( F a" ~electrical equipment. One example of this is the combination of magnet wire, ground insulation, varnish,
, `0 ~( K$ T) [4 w0 G% Ylead wire insulations, and outer wrapping of a coil. These intimate combinations are evaluated as
2 m5 ?! V( k, S C q7 e. q. Yunique groups. When multiple groups exist, either within a given insulation system or a different
. N& Y6 Y% |0 y) |+ binsulation system, components of one unique group shall not be added to another unique group.* n- D+ }$ F6 Z9 @0 w
However, more than one group is able to be used within a single device when at least a 3.05 mm* B5 I3 \7 v' |. O J6 ?
(0.125 inch) air space is used to separate them. Any material or component existing outside the outer
. A: d- h* A" |wrap of the device or not in contact with the windings is not determined to be part of the insulation0 D- a% b/ n9 \$ d l( K2 q, B
system.” |
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