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高人指导下，同学习# W' d: @, U$ F, f( @7 Y
2.10.4.2 Material group and comparative tracking index k, K( \: g' R9 P& C+ I
Material groups depend on the comparative tracking index (CTI) and are classified as follows:8 N( e& O/ X4 F2 o5 S
Material Group I CTI ³ 600
4 t e9 f7 A0 h" i) BMaterial Group II 400 £ CTI < 600, x) d7 L2 C/ w A: ]3 D) ^( z9 d
Material Group IIIa 175 £ CTI < 4009 N+ ?% k) G3 J9 ]% E% T1 f- Z6 q( P
Material Group IIIb 100 £ CTI < 175
3 [" I- ^9 m9 A" [% ?9 ^% X$ AThe material group is verified by evaluation of the test data for the material according to IEC
$ i8 E2 w6 Y! w0 D. ^" O, L: k60112 using 50 drops of solution A.
B) ~- [, x6 ]. }, PIf the material group is not known, Material Group IIIb shall be assumed./ Z8 ~4 }9 m! I. }9 r n9 r$ Q: m
If a CTI of 175 or greater is needed, and the data is not available, the material group can be
& H, I: z) S P4 ~" G. O, westablished with a test for proof tracking index (PTI) as detailed in IEC 60112. A material may B8 E5 ]/ o; H. j: y; J+ X1 C. s
be included in a group if its PTI established by these tests is equal to, or greater than, the lower2 ]! V# n& n+ P( J2 A5 K3 y: ~
value of the CTI specified for the group.
$ |9 h/ _) b8 y4 j
: N7 k/ a- h% U; E4 H" ~! H——UL60950-1-2007 |
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发表于 2011-11-3 21:39
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