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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:5 @- F: g( j5 q" z- r: D9 K$ z
“A unique intimate combination of two or more insulating materials used in
% G: c$ h {3 s/ G X6 _. ]electrical equipment. One example of this is the combination of magnet wire, ground insulation, varnish,
9 j% [! D- l! o! q5 ylead wire insulations, and outer wrapping of a coil. These intimate combinations are evaluated as4 l9 x, j* ~; v8 K/ x* J' [
unique groups. When multiple groups exist, either within a given insulation system or a different7 P1 @+ p! t% X- h: a x, _
insulation system, components of one unique group shall not be added to another unique group.( {1 k. a x, f2 R
However, more than one group is able to be used within a single device when at least a 3.05 mm8 t2 y1 F8 Z0 S3 U9 p4 |2 r- ]3 ~9 y
(0.125 inch) air space is used to separate them. Any material or component existing outside the outer9 V. \( t) U+ j- `9 \1 a
wrap of the device or not in contact with the windings is not determined to be part of the insulation" ?( s/ z j6 ~6 r# K
system.” |
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