Electric Heater installation

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rjspark

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Branchburg, NJ
I am presently working at a location that has existing electric heating. They are single phase 480V 3000W heaters. They have them fed from a 3 phase 20A breaker with 3- #8 awg feeding a 40A breaker mounted in a separate disconnect enclosure. Then they are wired through a 120V contactor, which is controlled by a 120V thermostat. Then there are 4 of the single phase 3000W heaters wired to the 3 phases. Now is it me or am I missing something:confused: I am going to bring my amp probe with me tomorrow to see exactly what these are drawing. I would appreciate any enlightenment to what I may or may not be missing. Thanks
 
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