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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:' t) ^+ _3 Y5 |' T) P
“A unique intimate combination of two or more insulating materials used in
1 A, k! |* a' Z# P. Q9 P3 w Kelectrical equipment. One example of this is the combination of magnet wire, ground insulation, varnish,
: f r* b! v) i& I. p) e% Alead wire insulations, and outer wrapping of a coil. These intimate combinations are evaluated as# U0 y0 V! y2 w9 q; r$ Q9 A) u0 m8 x& v
unique groups. When multiple groups exist, either within a given insulation system or a different
$ W i$ k# D' \9 o% jinsulation system, components of one unique group shall not be added to another unique group.. c/ y+ R" V1 W
However, more than one group is able to be used within a single device when at least a 3.05 mm
" n. {' r4 \ U(0.125 inch) air space is used to separate them. Any material or component existing outside the outer
) u2 d: q. N4 a; ~wrap of the device or not in contact with the windings is not determined to be part of the insulation
4 f7 }. u5 M: O0 ~( ysystem.” |
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