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High Volt Arc Track Rate (HVTR) - UL 746
HVTR is the rate that a tracking path can be produced on the surface of the material under standardized test conditions.
Performance Level Categories (PLC) were introduced to avoid excessive implied precision and bias.
| HVTR Tracking Rate (mm/min) | PLC |
|---|---|
| 0 through 10 | 0 |
| 10.1 through 25.4 | 1 |
| 25.5 through 80 | 2 |
| 80.1 through 150 | 3 |
| >150 | 4 |