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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:* @" n" `1 ?6 x' H1 P3 E3 `0 i
“A unique intimate combination of two or more insulating materials used in, h7 H' E) x& F( {) Z
electrical equipment. One example of this is the combination of magnet wire, ground insulation, varnish,
" v- g, e' N7 Q! u. xlead wire insulations, and outer wrapping of a coil. These intimate combinations are evaluated as5 i; O3 F3 ?% D1 C! k
unique groups. When multiple groups exist, either within a given insulation system or a different
) \7 ^' p: a& E3 {2 T% Qinsulation system, components of one unique group shall not be added to another unique group.
- a: c8 J7 ]$ [( N9 o/ JHowever, more than one group is able to be used within a single device when at least a 3.05 mm) g" H2 w$ k) M
(0.125 inch) air space is used to separate them. Any material or component existing outside the outer; w) D2 B* @, X5 T
wrap of the device or not in contact with the windings is not determined to be part of the insulation6 L; X) Z$ ?8 k! N' _ G2 p6 j( @
system.” |
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