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有,IEC60335-1 的29章里,根据CTI来划分材料等级的
" h, d2 ]* D' N9 g5 D IEC60335-1:2001+A1:2004+A2:2006 ! I4 x( g h' g9 x! S
The relationship between the material group and the comparative tracking index (CTI) values,
" k; y5 x: |, z+ f- @: o9 {7 xas given in subclause 2.7.1.3 of IEC 60664-1, is as follows:: q) w4 K s1 e( |/ S
– material group I: 600 ≤ CTI;
5 n3 k' }7 M, ] @% A– material group II: 400 ≤ CTI < 600;
! N# H4 A G, d- t1 f( p– material group IIIa: 175 ≤ CTI < 400;& g0 \- | T* ?. w
– material group IIIb: 100 ≤ CTI < 175, |
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