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|  DSH 714
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2 G: L/ \: P6 a, u+ @2 P' T | Application of tracking test) p) z6 A. @8 [+ w @- K) a
| 29.2) f8 U4 n: f7 T" f4 u/ L
| 60335-1(ed.4)
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2 F$ U; D* h2 [6 ^: K4 oQuestion:; @! f; r: | T
It is stated in clause 29.2 of IEC 60335-1 that insulating material in connection with required creepage distances has to be of material group I, II, IIIa or IIIb.; I! D+ T! k, G% {( v4 i
For example, there may be 10 different relevant materials in a simple motor, all of which have to be tested unless the materials are already separately certified for CTI. Often we hear from customers that they have to deliver certificates or special prepared test
: B3 w& b$ X _6 O' H: L$ |samples in case the parts are not satisfactory for testing, due to size or shape.& Y) |* K+ A9 v% ]5 e0 u& r
Is it always necessary to verify that the material group is at least of material group IIIb.?3 M, e; q9 _# c/ g2 `
Decision:! N8 \6 }9 G9 s6 n" u C& H! J
Yes, it is always necessary to verify that the material group is at least of group IIIb.
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发表于 2012-9-8 13:10
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