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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:% P% g$ U7 I) @8 @. v
“A unique intimate combination of two or more insulating materials used in0 M9 E* K/ T2 n# F& d
electrical equipment. One example of this is the combination of magnet wire, ground insulation, varnish,3 p2 [& [2 W1 x5 h; m* l+ I
lead wire insulations, and outer wrapping of a coil. These intimate combinations are evaluated as& R* K( h: _: \/ ^7 Z7 G$ j. M
unique groups. When multiple groups exist, either within a given insulation system or a different
9 d& e2 ]& Q5 y# |: Q" q E( ~6 Q" G) @insulation system, components of one unique group shall not be added to another unique group.
) @ \- u/ }4 F% R3 ^However, more than one group is able to be used within a single device when at least a 3.05 mm A1 J: |: U: m: t x, B ^
(0.125 inch) air space is used to separate them. Any material or component existing outside the outer
( V6 h( K# J" C, qwrap of the device or not in contact with the windings is not determined to be part of the insulation4 }& g. k1 ^) u3 q ?! b
system.” |
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