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Comparative Tracking Index (CTI) - UL 746
The voltage which causes tracking after 50 drops of 0.1% ammonium chloride solution have fallen on the material. The results of testing at 3 mm thickness are considered representative of the material's performance in any thickness.
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 |