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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:6 a; X( f/ r2 ]4 o* z4 h) S& c
“A unique intimate combination of two or more insulating materials used in4 t7 u5 [7 t5 j+ Z2 D( G
electrical equipment. One example of this is the combination of magnet wire, ground insulation, varnish,
2 D* n/ y7 @& \2 a) i( f) @) Hlead wire insulations, and outer wrapping of a coil. These intimate combinations are evaluated as
' `' I1 Z; P* `$ Q# f- w3 Y9 A6 j/ ]unique groups. When multiple groups exist, either within a given insulation system or a different! ?4 T, D T, O/ A; Y. W0 `: o
insulation system, components of one unique group shall not be added to another unique group.
1 o) {% x9 P# V% |. l( p7 NHowever, more than one group is able to be used within a single device when at least a 3.05 mm; j/ V" J% z* a0 G
(0.125 inch) air space is used to separate them. Any material or component existing outside the outer) t8 R# u1 Q; s
wrap of the device or not in contact with the windings is not determined to be part of the insulation
0 [. D1 b$ X8 Y) B: m/ P# \1 ]system.” |
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