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High-current arc ignition (HAI)

High-current arc ignition performance is expressed as the number of arc rupture exposures (standardized to the electrode type and shape and electric circuit) that are necessary to ignite a material when they are applied at a standard rate on the surface of the material.

HAI range
mean number of arcs
assigned

PLC
assigned

120 and greater

0

60 through 119

1

30 through 59

2

15 through 29

3

Less than 15

4