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有,IEC60335-1 的29章里,根据CTI来划分材料等级的
2 U6 J2 L6 `0 \# x Y9 a IEC60335-1:2001+A1:2004+A2:2006 , j0 ?' H5 `+ i, K: A; w- P6 f# W0 c
The relationship between the material group and the comparative tracking index (CTI) values,+ S8 s8 F. P6 O7 S, o L7 K
as given in subclause 2.7.1.3 of IEC 60664-1, is as follows: j8 R) b0 B w
– material group I: 600 ≤ CTI;
* E& ~2 [. s5 B; w- `* r– material group II: 400 ≤ CTI < 600;0 i8 Z+ c: n- S' `7 ^! ]; v( M d
– material group IIIa: 175 ≤ CTI < 400;" ]5 M9 T' f7 Y
– material group IIIb: 100 ≤ CTI < 175, |
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