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有,IEC60335-1 的29章里,根据CTI来划分材料等级的
! G, y6 f: \" ]- ~ IEC60335-1:2001+A1:2004+A2:2006
3 _! `* s8 |5 H/ z# q7 G" nThe relationship between the material group and the comparative tracking index (CTI) values,7 y4 G5 O, C" U# x; e# q- U9 g! Q
as given in subclause 2.7.1.3 of IEC 60664-1, is as follows:) W/ w1 |7 g( f1 v/ X0 d& m* o
– material group I: 600 ≤ CTI;) n9 v1 a/ G4 i; o. |0 J) z
– material group II: 400 ≤ CTI < 600;
# u+ O/ C% }: N% U5 D/ y! R! o– material group IIIa: 175 ≤ CTI < 400;8 ]9 q/ L; e9 F* D& H! ^7 `, {0 j
– material group IIIb: 100 ≤ CTI < 175, |
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