3 phase delta question

hardworker

Senior Member
I am getting ready to install a commercial electric hot water heater. Heater specs say unbalanced three-phase delta 240vt. The building has three phase grounded delta 240vt. Do I have a problem? Please explain if there is a difference. Thanks
 

kwired

Electron manager
Location
NE Nebraska
I am getting ready to install a commercial electric hot water heater. Heater specs say unbalanced three-phase delta 240vt. The building has three phase grounded delta 240vt. Do I have a problem? Please explain if there is a difference. Thanks
Tell us exactly what heater specs say, and whether you have corner ground delta or a system with a high leg.
 

Smart $

Esteemed Member
Location
Ohio
My guess is the water heater has two 240V elements, one end of each wired to a common line, other ends to other lines.
:)
 

kwired

Electron manager
Location
NE Nebraska
Grounded delta to me means a corner ground, but rembering a discussion with a POCO staking engineer a few days ago, now I wonder if that is correct.

Mods: please move to new thread if you feel it is warranted.
A grounded system means there is a grounded conductor the typical high leg delta and corner ground delta systems are both grounded systems.
 

kwired

Electron manager
Location
NE Nebraska
A steam boiler at a plant I work at preheats the water in the feed tank before it is fed to the boiler. This feed tank is where condensate returns, but if it gets low enough is supplied with fresh city water. So we are heating the water before we heat it in that case.
 

jumper

Senior Member
A steam boiler at a plant I work at preheats the water in the feed tank before it is fed to the boiler. This feed tank is where condensate returns, but if it gets low enough is supplied with fresh city water. So we are heating the water before we heat it in that case.
That is because really bad things can happen if you suddenly a dump a large amount of cold water into a hot boiler.
 

domnic

Senior Member
Occupation
Electrical Contractor
3 pase delta

3 pase delta

A delta three phase high leg or corner grounded makes no difference if its a three phase heater the only time a high leg comes in to play is you are running a 120 volt circuit . if you have a corner grounded delta you do not have a high leg.
 
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