Single Phase Heaters on Three Phase Disconect

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maloo

Member
Location
Marion, Iowa
Working on a job were the engineer has three 4.5 kw 480 single phase heaters that are thermostatically controlled through a 3 pole contactor in a fused three phase MCC bucket. First heater is on phase AB, second BC and third CA. I presume to balance load and reduce current per phase.

I have never seen this done this way before and have looked through article 427 and didn't see anything that says this isn't legal. I'm curious if this is and acceptable/legal method of wiring electric heaters.
 

roger

Moderator
Staff member
Location
Fl
Occupation
Retired Electrician
It depends on the fuse size.


Well, if we're going to start nitpicking it would also depend on the wire size, is it copper or aluminum, are the fans continuous or non-continuous, what can you see looking out the window, etc...... ;):D

JK

Roger
 

sameguy

Senior Member
Location
New York
Occupation
Master Elec./JW retired
The drive way?
How is that configurated.com into the load.
Do we need to do some cyphering?
 

maloo

Member
Location
Marion, Iowa
Thanks for the input. Just though it was a little odd because if one fuse were to blow then one heater would still work. Btw they are radiant heaters no fans.
 
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