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高人指导下，同学习6 l& b% w. T. S: o
2.10.4.2 Material group and comparative tracking index
1 f: Z: z# p5 e; P C+ U3 j- c* PMaterial groups depend on the comparative tracking index (CTI) and are classified as follows:
$ x4 M( H C' L V: C9 vMaterial Group I CTI ³ 600
U" }: b M$ D0 ZMaterial Group II 400 £ CTI < 600
5 ?2 K5 j( s6 pMaterial Group IIIa 175 £ CTI < 400
' r ]/ ^' L5 TMaterial Group IIIb 100 £ CTI < 1754 o H; ?7 G( k& \# s+ T: R0 F+ |
The material group is verified by evaluation of the test data for the material according to IEC, k& Q/ l9 f) D# g, f4 U! v
60112 using 50 drops of solution A.. o: ]' E0 L. X5 ^
If the material group is not known, Material Group IIIb shall be assumed.
; h" c4 i: _+ m, p# Z) z# w# |If a CTI of 175 or greater is needed, and the data is not available, the material group can be$ _, Z s8 X7 L* a& J
established with a test for proof tracking index (PTI) as detailed in IEC 60112. A material may9 f; L( j- t9 h- B4 [ a7 T" _
be included in a group if its PTI established by these tests is equal to, or greater than, the lower
- l) X) w3 {' ?3 n0 ]# v1 }value of the CTI specified for the group.
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3 o# o% c5 q. h) r1 I6 K——UL60950-1-2007 |
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