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Transfer switch feeder #18417
12/09/02 10:41 PM
12/09/02 10:41 PM
S
sparkync  Offline OP
Member
Joined: Oct 2002
Posts: 830
NC
I think I'm missing something..must be because I'm tired tonight... If I have a 8000 wt. generator and using 120 volts circuits it can handle 66.6 amps, and on 240 volts it can handle 33.3 amps, should not the feeder and main breaker be rated at 66.6 amps..at the maximum capacity?? I think I might be missing something here.. awfully tired [Linked Image] I feel like this is probably a dumb question, but just can't get my head to work right, right now [Linked Image] Is the sizing different on generators?? Thanks....Steve

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Re: Transfer switch feeder #18418
12/10/02 01:21 AM
12/10/02 01:21 AM
Trumpy  Offline

Member
Joined: Jul 2002
Posts: 8,231
SI,New Zealand
Steve,
Sit down with a coffee, do your calc's again,
I am sure that you have missed something.
Have you figured Power Factor(Cos Phi), in to your calcs?.
How about losses?. [Linked Image]

Re: Transfer switch feeder #18419
12/10/02 08:33 AM
12/10/02 08:33 AM
J
jdevlin  Offline
Member
Joined: Aug 2002
Posts: 402
welland ontario canada
Think double pole. 33.3 x 2 =66.6

Re: Transfer switch feeder #18420
12/10/02 04:00 PM
12/10/02 04:00 PM
P
pauluk  Offline
Member
Joined: Aug 2001
Posts: 7,520
Norfolk, England
Assuming that the generator's 120V output is split across each half of the 240V winding, then loading 4000 watts on each leg (ignoring power factor concerns) would result in 33.3A on each side of the breaker. The neutral in this case would carry no current, just as if the supply were from a xfmr.


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