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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:# e. T3 _! l E5 ]+ y; q
“A unique intimate combination of two or more insulating materials used in& @' e8 A, ^3 ?0 {. G
electrical equipment. One example of this is the combination of magnet wire, ground insulation, varnish,/ o! ]; V; v" i0 z- Z/ o
lead wire insulations, and outer wrapping of a coil. These intimate combinations are evaluated as
% ]. U! B7 U, ?( e5 Munique groups. When multiple groups exist, either within a given insulation system or a different
: H; g3 x/ F* j+ y. yinsulation system, components of one unique group shall not be added to another unique group.
* M' T& o4 t4 |: xHowever, more than one group is able to be used within a single device when at least a 3.05 mm
. S3 n8 _; D+ J& |+ a0 q(0.125 inch) air space is used to separate them. Any material or component existing outside the outer$ ~3 ^* C9 A/ |/ T" N$ M# X
wrap of the device or not in contact with the windings is not determined to be part of the insulation
6 I$ @( k" d4 O' V0 e% O- Msystem.” |
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