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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:' K. } z3 g! L/ \$ z* C: c
“A unique intimate combination of two or more insulating materials used in$ L* K# p. [* P2 b# V: Q/ Y8 T
electrical equipment. One example of this is the combination of magnet wire, ground insulation, varnish,
# v) W1 K7 i; `; z3 N2 z; Flead wire insulations, and outer wrapping of a coil. These intimate combinations are evaluated as
! }# H3 e1 |! C% o- a7 _4 {) ~unique groups. When multiple groups exist, either within a given insulation system or a different( P# X* I8 u- }1 K! _, G
insulation system, components of one unique group shall not be added to another unique group.6 l4 @* z: h6 c1 K
However, more than one group is able to be used within a single device when at least a 3.05 mm
5 Q; C6 a* E% T6 b( e# z(0.125 inch) air space is used to separate them. Any material or component existing outside the outer0 X# F: k. n# Z: j& c1 s7 x9 k5 k
wrap of the device or not in contact with the windings is not determined to be part of the insulation
, Z; O3 l- c7 b8 _! Isystem.” |
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