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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:/ V2 K ], Z5 X' s# k: O: C
“A unique intimate combination of two or more insulating materials used in
# t( w$ V/ l4 X! z, p _1 ~# t ~electrical equipment. One example of this is the combination of magnet wire, ground insulation, varnish,6 g) k) \ y, p. ]2 z" T1 j
lead wire insulations, and outer wrapping of a coil. These intimate combinations are evaluated as8 S3 Z8 Q" u( t" s; C, O9 O
unique groups. When multiple groups exist, either within a given insulation system or a different/ ]- q5 k& X: ]* d% ]4 L
insulation system, components of one unique group shall not be added to another unique group.
( B4 y" B& E* A/ e( E7 PHowever, more than one group is able to be used within a single device when at least a 3.05 mm) P/ M& E, l1 Z
(0.125 inch) air space is used to separate them. Any material or component existing outside the outer! F6 E; t) o9 ^& G1 t' n, ]* j
wrap of the device or not in contact with the windings is not determined to be part of the insulation
- G1 }( P6 @- M2 L9 V' [1 _8 B6 wsystem.” |
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