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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|