480V panel to feed 240V panel
- Thread starter anbm
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petersonra
Senior Member
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- Northern illinois
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- engineer
It will likely pass muster, but the devil is in the details. Seems like an expensive solution.
I want to correct: add (3) 600A/2P breakers in 1600A swbd to feed (3) existing 600A, 240/1 panels because there is no such thing 1600A, 240/1 swbd.
petersonra
Senior Member
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- Northern illinois
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- engineer
is the switchboard already there?
Your not going to get an existing 120/240v Single phase transformer to feed a new 480v piece of gear.
Now,
The Power company may provide a new transformer to feed a new 1600 amp 480/277v 3ph 4w outdoor piece of gear, but, there's going to have to be some 480v Delta to 120/240v 1ph step down transformers coming up somewhere in this conversation if the plan is to reefed some existing 120/240v single phase panels.
A more detailed explanation is needed.
JAP>
It is new swbd. Xfmr and (3) 600A, 240/1 panels are existing. Three panels are currently fed from another / smaller size single phase xfmr, I want to remove that xfmr.
If you're installing a new 480/277v 3ph 4w service to a new 1600 amp 480v 3ph 4wire outdoor switchboard,
and,
You are wanting to get rid of the existing 120/240v single phase panel feeding the existing panels,
You are going to have to incorporate some 480v primary 120/240v 1ph secondary transformers somewhere to reefed the existing 120/240v 1ph panels.
You cannot feed them directly from the new switchboard as was described above.
Jap>
petersonra
Senior Member
- Location
- Northern illinois
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- engineer
Instead of a switchboard why not get a 240 v panelboard
Sure they do.
Now, will the power company offer a service that large in Single Phase ?
I doubt they would.
JAP>
petersonra
Senior Member
- Location
- Northern illinois
- Occupation
- engineer
Maybe feed the 240V 1 phase inside directly and hook it to some bus duct and then feed from there to the 3 600 A panels. All you would need outside would be a service rated switch or enclosed circuit breaker.
are these 600 A panelboards all in the same building? are you allowed to run three feeders to the same building?
are these 600 A panelboards all in the same building? are you allowed to run three feeders to the same building?
at 1600 A?
Call the power company.
They will be the determining factor in what they will or will not offer you for your situation.
On another note,Panelboards stop at 1200 amps, Switchboards start at 1600 amp and climb the ladder all the way up to 6000 amp.
Even in 120/240v 1ph I believe if one actually wanted to go that silly route.
JAP>
They will be the determining factor in what they will or will not offer you for your situation.
On another note,Panelboards stop at 1200 amps, Switchboards start at 1600 amp and climb the ladder all the way up to 6000 amp.
Even in 120/240v 1ph I believe if one actually wanted to go that silly route.
JAP>
petersonra
Senior Member
- Location
- Northern illinois
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- engineer
what is the point of replacing the existing stuff?
what is your plan when your 40 year old transformer dies and the POCO has no replacement?
Replace service to 208V three phase and all 240V appliances to 208V?
petersonra
Senior Member
- Location
- Northern illinois
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- engineer
given the age of the transformer I would be looking at a better plan. is this an apartment building?
yes
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