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Comparative Tracking Index



The Comparative Tracking Index or CTI is used to measure the electrical breakdown (tracking) properties of an insulating material. To measure the tracking, 50 drops of 0.1% ammonium chloride solution are dropped on the material, and the voltage measured for a 3mm thickness is considered representative of the material performance.

Additional recommended knowledge

Tracking is an electrical breakdown on the surface of an insulating material. A large voltage difference gradually creates a conductive leakage path across the surface of the material by forming a carbonized track.

Performance Level Categories (PLC) were introduced to avoid excessive implied precision and bias.

Tracking Index (V) PLC
600 and Greater 0
400 through 599 1
250 through 399 2
175 through 249 3
100 through 174 4
< 100 5
 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Comparative_Tracking_Index". A list of authors is available in Wikipedia.
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