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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