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有,IEC60335-1 的29章里,根据CTI来划分材料等级的
& _' l+ }$ o! i! A6 V3 G IEC60335-1:2001+A1:2004+A2:2006
4 M7 f, I- d% r% I- K5 C) f% C$ hThe relationship between the material group and the comparative tracking index (CTI) values,) G& e( x2 a2 D' b
as given in subclause 2.7.1.3 of IEC 60664-1, is as follows:4 Q9 W% \! `* R$ f
– material group I: 600 ≤ CTI;
1 O1 L7 ]) ?1 @ c: u– material group II: 400 ≤ CTI < 600;6 B, x- v# w& F- y9 f \. H
– material group IIIa: 175 ≤ CTI < 400;
- E7 D" _9 ? i& _! ]! h– material group IIIb: 100 ≤ CTI < 175, |
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