From my experience they go the other way and inflate the power of their machines. The real test would be to measure the power used when the machine is loaded to a reasonable maximum load. My "2HP" table saw will trip a 15a(120v) breaker if I am really loading it down, like ripping 2" hardwood but it never trips a 20. The motor overload will go first.
Re: 80% rule#90414 11/21/0408:11 AM11/21/0408:11 AM
I think I remember "hearing" about this rule, and never found it anywhere (except for AC units.) But the idea was not to load a circuit past 80%. I think it is an older motor rating rule no longer in use. Which is not the same as sizing the circuit conductors, over-current and short-circuit protection in that application for bandsaw.
440.62 Branch-Circuit Requirments (C) Where Lighting Units or Other Appliances Are Also Supplied. The total marked rating of a cord-and-attachment-plug-connected room air conditioner shall not exceed 50 percent of the rating of a branch circuit where lighting outlets, other appliances, or general-use receptacles are also supplied. Where the circuitry is interlocked to prevent simultaneous operation of the room air conditioner and energization of other outlets on the same branch circuit, a cord-and-attachment-plug-connected room air conditioner shall not exceed 80 percent of the branch-circuit rating.
Mark Heller "Well - I oughta....." -Jackie Gleason
Re: 80% rule#90417 11/23/0402:26 AM11/23/0402:26 AM