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kwired

kwired

Electron manager
Location
NE Nebraska
bob said:
Thats not it works. If you need 166 kva at 240 volts the the amps = 400 amps
You will need to supply 166 kva at 208 volts. 166/(,208 x 1,73) = 461 amps.
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OP did not give us 166KVA, he gave us 400 amps @ 240 volts, then wanted to convert to 208 but still supply the same load. Same load will still be 166 KVA but will be higher amps as you said. So is his service still large enough? I don't know what his real load calc is, maybe he will be ok maybe not.

Add: maybe should have said needed to convert to 208, instead of wanted to convert.
 
bob

bob

Senior Member
Location
Alabama
If you assume the load is 166 kva @ 240 volt and the utility voltage is 208 volts, then the 400 amps is not large enough. There are a lot of assumptions.
 
iwire

iwire

Moderator
Staff member
Location
Massachusetts
bob said:
If you assume the load is 166 kva @ 240 volt and the utility voltage is 208 volts, then the 400 amps is not large enough.
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That is exactly what he has been saying. :)

But when was the last time you saw a calculated load come out to exactly 400 amps?

Where I am once you pass 200 amps you pretty much move to 400 as the meter sockets and panelboards will be rated 400 anyway even if you decide to use a 250, 300 or 350 amp main.
 
kwired

kwired

Electron manager
Location
NE Nebraska
I was merely pointing out that you will lose about 13% total kVA capacity if you put this on 208 volts and if the load calc happens to be close to 400 it may need serious consideration. I realize the actual load calc likely was not 400 amps, but nothing says it couldn't have been 367, 300, 272, or 390 does it?
 
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