Mike Lamb Posted April 2, 2012 Report Share Posted April 2, 2012 This main disconnect has adjustable dials. What are they for and does a homeowner need any knowledge about their settings? Or do I for that matter? I suppose they are for some sensitivity response to over loads but I'm guessing. Click to Enlarge 68.9 KB Click to Enlarge 34.78 KB Quote Link to comment Share on other sites More sharing options...
Jim Katen Posted April 2, 2012 Report Share Posted April 2, 2012 Perhaps an adjustable time delay? Quote Link to comment Share on other sites More sharing options...
Marc Posted April 2, 2012 Report Share Posted April 2, 2012 I think the adjustment on the left is there for the factory to set the magnetic trip I(m), characteristics of the breaker to whatever it's supposed to be for that particular panel. This particular adjustment seems capable of reaching values of anything between 5 and 10 times the value of the thermal trip, I(n). I don't think it's there for the homeowner or even the electrician to play with. If you look at the label, it might tell you just what value of I(m) the adjustment is supposed to be set at. I don't know what the adjustment on the right side is for. A better view might help. Marc Quote Link to comment Share on other sites More sharing options...
inspector57 Posted April 2, 2012 Report Share Posted April 2, 2012 I've never seen it but then at 400 amps, that in itself would be a rareity. Quote Link to comment Share on other sites More sharing options...
Bill Kibbel Posted April 3, 2012 Report Share Posted April 3, 2012 They are breakers manufactured for industrial equipment. The dials are to make adjustments to the breakers to match the characteristics of industrial motors. In other words, to minimize nuisance tripping on motor start-up. Quote Link to comment Share on other sites More sharing options...
Mike Lamb Posted April 4, 2012 Author Report Share Posted April 4, 2012 This is in a house with nothing electrically special going on. 100 amp main panel would be just fine. Quote Link to comment Share on other sites More sharing options...
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