I have a situation where this commerecial building(actually a chapel/mausoleum) needs more heat .The building has a 400 amp 3phase 208 v service w/2 200 amp panels and a dist. panel.the total load about 100 amps w/o the elavator, dont now the draw on it.My problem is i need the power of the 480v heaters if possible.I'd like to add two 2 110000 btu heaters.They both draw about 36 amps each.I'd like to install a step up transformer and install another panel 480v.I realize this would add about 160 amps to the total load.Is this the only way? See any problems or other solutions.Also this is a concrete building so the 60 amp feed that i have is all i can work with .I cannot run new pipe concrete ceilings, marble walls.Thanks in advance
need more heat
- Thread starter jersey
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- Lockport, IL
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- Semi-Retired Electrical Engineer
Re: need more heat
I don't see a problem adding 160 amps (at 208 volts) to a building that has a 400 amp service and a 100 amp existing load (plus an elevator of unknown load. A 75KVA step-up transformer should do the job. But this part confuses me:
I don't see a problem adding 160 amps (at 208 volts) to a building that has a 400 amp service and a 100 amp existing load (plus an elevator of unknown load. A 75KVA step-up transformer should do the job. But this part confuses me:
Where did a 60 amp feed come into this discussion? Are you saying that you can put the step-up transformer in one building, and you can only run conductors that are good for 60 amps (or perhaps these conductors are existing) to the other building (i.e., the one that needs the heat)? Are you saying that you can only have 60 amps at 480 volts, and that you want to run 72 amps worth of heat? Please clarify.
- Location
- Lockport, IL
- Occupation
- Semi-Retired Electrical Engineer
Re: need more heat
Sounds like you may have to settle for smaller heaters. I don't know of any special tricks that would let you supply two heaters that could each be running at 36 amps, if all you have available is #6.
Sounds like you may have to settle for smaller heaters. I don't know of any special tricks that would let you supply two heaters that could each be running at 36 amps, if all you have available is #6.
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