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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: Y. i( N. N7 C; ~
“A unique intimate combination of two or more insulating materials used in9 }- Q0 k& X% ~. i7 t7 {2 Q
electrical equipment. One example of this is the combination of magnet wire, ground insulation, varnish,
$ j- @8 t( s) K I" k4 N# K3 {# ^4 f' ylead wire insulations, and outer wrapping of a coil. These intimate combinations are evaluated as
' b( I7 u8 b9 z6 O5 R) `unique groups. When multiple groups exist, either within a given insulation system or a different
9 E( v8 J* X0 N7 y% Einsulation system, components of one unique group shall not be added to another unique group.9 j S5 w3 A$ _
However, more than one group is able to be used within a single device when at least a 3.05 mm! o8 z6 s4 X! z- _ T
(0.125 inch) air space is used to separate them. Any material or component existing outside the outer
0 h: M2 F0 R+ T0 b0 Twrap of the device or not in contact with the windings is not determined to be part of the insulation& w5 x. J& L8 g, _% }
system.” |
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