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Comparative Tracking Index (CTI) IEC 60112

This method is used to assess the relative resistance of insulating materials to tracking.

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Comparative tracking electrode

  CTI / tracking IEC 60112

 

Test specimen ≥20 mm x ≥20 mm x ≥3 mm
Test voltage Between 100 V and 600 V (50 Hz) in 25 V steps
IEC Test solution 395 Ωcm
Drop volume 20 mm³
Failure criteria Current on breaking ≥0,5 A >2,0 s or material burns

 

Results of the test method:

Insulating material group CTI
I 600 ≤ CTI
II 400 ≤ CTI < 600
IIIa 175 ≤ CTI < 400 (FR4)
IIIb 100 ≤ CTI < 175
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