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有,IEC60335-1 的29章里,根据CTI来划分材料等级的
% n) ^, c+ Y1 X u! E( |, u IEC60335-1:2001+A1:2004+A2:2006
9 G8 ?, f, \# B5 E8 Y& uThe relationship between the material group and the comparative tracking index (CTI) values,. F+ }. J! R+ e( X7 L- D- P& V8 R
as given in subclause 2.7.1.3 of IEC 60664-1, is as follows:- d, W! f0 `" h- ]8 p. H
– material group I: 600 ≤ CTI;
$ A' p7 q2 V. k8 |% a. g# e5 ]4 E/ b– material group II: 400 ≤ CTI < 600;3 v$ S. ]9 b9 G/ k: T- j9 j
– material group IIIa: 175 ≤ CTI < 400;: W& [* @, K# W7 h- b3 ^' }( u
– material group IIIb: 100 ≤ CTI < 175, |
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