To backup my claim about UL's desire for a 75 amp magnetic trip breaker, starting on page 8 with "Lowering the Instantaneous Trip Level of Circuit Breakers":
Page 11
Page 11
The results of the study sponsored by the EIA determined that lowering the instantaneous trip level below 105 A rms would provide a greater potential reduction in fire risk. Lowering the instantaneous trip level to 75 A rms to cover all receptacles would also increase the possibility of nuisance tripping. AFCI technology, on the other hand, has the ability to detect the current signatures of parallel arcs so that the effective in stantaneous trip level can be lowered to 70 A rms without the increased risk of nuisance tripping.
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