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High Amp Arc Ignition (HAI) - UL 746

The number of arc rupture exposures necessary to ignite a material when they are applied at a standard rate on the surface of the material.

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

HAI Mean Number of Arcs PLC
120 and greater 0
60 through 119 1
30 through 59 2
15 through 29 3
<15 4