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高人指导下，同学习. G% y, z+ U# R, u
2.10.4.2 Material group and comparative tracking index
) V* H! g; K$ _% g G4 BMaterial groups depend on the comparative tracking index (CTI) and are classified as follows:/ f6 t4 f U. M, j
Material Group I CTI ³ 600
5 J! y7 n4 V8 H0 j( N( o- v, ?Material Group II 400 £ CTI < 600: U0 t# o2 s( _# K7 `
Material Group IIIa 175 £ CTI < 400, ?( U3 v! W- A/ F; y: v
Material Group IIIb 100 £ CTI < 175
$ Y) S3 d3 z2 i# K1 P# A, cThe material group is verified by evaluation of the test data for the material according to IEC
! Y1 e* N, b: @) e1 M60112 using 50 drops of solution A.
2 W' ^9 U+ T" U/ U. E+ a% x9 ]+ dIf the material group is not known, Material Group IIIb shall be assumed.
% Z: [' d2 [7 B' V; a6 iIf a CTI of 175 or greater is needed, and the data is not available, the material group can be. b- E" b/ N$ q0 c" Z$ D
established with a test for proof tracking index (PTI) as detailed in IEC 60112. A material may
: y0 c! F. H) q2 v% A, {" pbe included in a group if its PTI established by these tests is equal to, or greater than, the lower
4 y0 V" V W5 ?5 H! Cvalue of the CTI specified for the group.% Z* p1 P5 t% z5 r0 {
. q1 O! s8 Z$ r1 N5 _ ^4 x7 R
——UL60950-1-2007 |
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