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Hot-Wire Ignition (HWI) - UL 746
Test specimens are wrapped with resistance wire that dissipates a specified level of energy. HWI is the time it takes to either ignite or burn through a specimen.
Performance Level Categories (PLC) were introduced to avoid excessive implied precision and bias.
HWI Mean Ignition Time (sec) | PLC |
---|---|
120 and longer | 0 |
60 through 119 | 1 |
30 through 59 | 2 |
15 through 29 | 3 |
7 through 14 | 4 |
<7 | 5 |