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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:; `, F% l/ o9 E7 P8 `
“A unique intimate combination of two or more insulating materials used in$ B/ f% l {4 ?1 U
electrical equipment. One example of this is the combination of magnet wire, ground insulation, varnish,
7 _: M, X# H, Mlead wire insulations, and outer wrapping of a coil. These intimate combinations are evaluated as, D5 _1 s% o- W% D; O% o
unique groups. When multiple groups exist, either within a given insulation system or a different
9 l1 D) {% a2 R/ o, \insulation system, components of one unique group shall not be added to another unique group.
" A; p! T$ L1 a3 ]: a0 [3 o2 bHowever, more than one group is able to be used within a single device when at least a 3.05 mm
2 `" V. W. s/ G/ I/ Y7 s) a' {% q- R9 X(0.125 inch) air space is used to separate them. Any material or component existing outside the outer
- v+ P! @% L% \. ~wrap of the device or not in contact with the windings is not determined to be part of the insulation1 s" \: o( u E: P( c& p4 |/ l' o
system.” |
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