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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:
+ E4 R0 y2 E. s) Q9 i6 {: W“A unique intimate combination of two or more insulating materials used in
1 e1 H1 w0 A0 A! B' pelectrical equipment. One example of this is the combination of magnet wire, ground insulation, varnish,2 W+ {) M; w8 J
lead wire insulations, and outer wrapping of a coil. These intimate combinations are evaluated as3 y+ R, n+ Q5 {+ ^6 b
unique groups. When multiple groups exist, either within a given insulation system or a different# U' @( _* ?9 M5 n- |, |7 z2 R# k
insulation system, components of one unique group shall not be added to another unique group.
* k+ U2 n0 |* w* m! H- KHowever, more than one group is able to be used within a single device when at least a 3.05 mm1 L9 |8 F) U- y' T+ ]; r
(0.125 inch) air space is used to separate them. Any material or component existing outside the outer
% w2 s0 o2 i. S- W% v. pwrap of the device or not in contact with the windings is not determined to be part of the insulation
: v7 ~ [, l8 w* O- }7 k; ?system.” |
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