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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:
' ~7 W, |5 p! q0 I5 k' ?“A unique intimate combination of two or more insulating materials used in z/ V8 n. x+ k5 K% Z0 g3 N
electrical equipment. One example of this is the combination of magnet wire, ground insulation, varnish,% _. [8 w/ B+ Q1 g
lead wire insulations, and outer wrapping of a coil. These intimate combinations are evaluated as
) N: r: L0 L0 Uunique groups. When multiple groups exist, either within a given insulation system or a different1 F/ d6 Q$ @5 N
insulation system, components of one unique group shall not be added to another unique group.
: r+ n6 p+ e( V( YHowever, more than one group is able to be used within a single device when at least a 3.05 mm) r2 v3 d& _( X1 y
(0.125 inch) air space is used to separate them. Any material or component existing outside the outer" N4 U4 J4 }. u6 M( t: I
wrap of the device or not in contact with the windings is not determined to be part of the insulation
; U# F" c! v9 U( |- wsystem.” |
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