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有,IEC60335-1 的29章里,根据CTI来划分材料等级的
8 E/ z( |6 {# Y% T& }/ d2 w IEC60335-1:2001+A1:2004+A2:2006
% W5 l: ^7 n9 wThe relationship between the material group and the comparative tracking index (CTI) values,: i, W$ I) t Q2 d, ]
as given in subclause 2.7.1.3 of IEC 60664-1, is as follows:! _9 D! `. K2 ~1 _
– material group I: 600 ≤ CTI;
( T% I+ S! d' R! m/ M6 U/ [7 `, J– material group II: 400 ≤ CTI < 600;
8 R% H- e# ` Q/ _( R– material group IIIa: 175 ≤ CTI < 400;3 O- |6 V% J9 d5 U% s9 E
– material group IIIb: 100 ≤ CTI < 175, |
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