Comfortably Numb Posted February 10, 2021 Report Share Posted February 10, 2021 My DWS779 miter saw trips the 20 amp breaker a lot. I've tested it at startup and the initial amp reading is 55 to 60 amps at start. Then quickly settles to 13 to 15 amp. I'm sure this is the cause Is this initial spike at startup normal? Does it seem high? The saw has a warranty. Getting Dewalt customer service on the line to discuss this, has been impossible for me. Quote Link to comment Share on other sites More sharing options...
wingless Posted February 11, 2021 Report Share Posted February 11, 2021 Welcome to the forum. Every electrical motor presents a largely inductive load to the source providing power. One characteristic of an inductive load is that the current does not want to change instantly. An inductive load does instead permit "instant" voltage changes. All that being said, it is very unusual for a motor to experience a startup current surge, even/especially a large motor. IMO, a more likely source for the problem is a defective breaker, insufficient wire gauge from the panel to the tool (in this case a 20A breaker should be 12 AWG), poor connection(s) from source to load or multiple poor connections from source to load. My first step suggestion is to swap the existing 20A breaker for a new part to see what happens. An inspection of the wiring condition wouldn't hurt either. Quote Link to comment Share on other sites More sharing options...
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