Heater Feed

[Alwayslearningelec]

hot water heater 60A unfused disconnect switch. 3P 60A breaker feeding from 277/480v panel only 50' run.

Using 1" EMT with #6's is ok I come up with? No neutral required? Could use conduit as a ground or pull separate ground? Thanks.

 

[augie47]

With the info given, #6 should be fine. Be good to know the KW so we are not assuming eveything is sized correctly.
Is there any flex involved ??

 

[Alwayslearningelec]

Thanks, no neutral needed? 1" Fine, no 1-1/4"?

 

[LarryFine]

Thanks, no neutral needed? 1" Fine, no 1-1/4"?

No neutral needed, EMT can be EGC, and three #6s will fit in 3/4" EMT so 1" is more than large enough.

Raceway Fill Calculator

 

[petersonra]

Thanks, no neutral needed? 1" Fine, no 1-1/4"?

probably not. most 3 phase electric water heaters are wired as delta. HOWEVER, I have seen a few where the elements are wired L-N.

EMT is fine as an equipment grounding conductor.

Keep in mind electric heaters require 125% ampacity for its conductors, but in general no more than 48 Amps per circuit is allowed anyway so 60 Amps is probably a good choice.