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High Voltage Arc Resistance to Ignition (HVAR) - UL 746

The number of seconds that a material resists ignition when subjected to a high voltage low current arcing source.

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

Mean Time to Ignition (sec) PLC
300 and longer 0
120 through 299 1
30 through 119 2
<30 3