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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! a/ R: [1 J
“A unique intimate combination of two or more insulating materials used in
' R; m# S& Z. v; F2 _7 @electrical equipment. One example of this is the combination of magnet wire, ground insulation, varnish,) R6 v3 w* P- {( J6 r
lead wire insulations, and outer wrapping of a coil. These intimate combinations are evaluated as
/ V9 k+ b. }* A/ l) Qunique groups. When multiple groups exist, either within a given insulation system or a different
5 \8 \/ T+ X& f% _9 y# }insulation system, components of one unique group shall not be added to another unique group.
- E3 f+ n. s# h. FHowever, more than one group is able to be used within a single device when at least a 3.05 mm
& \) i; S( L+ G3 a7 p. d(0.125 inch) air space is used to separate them. Any material or component existing outside the outer
8 ?, |3 t) @8 ?# Z/ T! Jwrap of the device or not in contact with the windings is not determined to be part of the insulation5 G: F2 m& e1 {; n$ t' ?
system.” |
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