generator feeder size
- Thread starter sparkyI
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chris kennedy
Senior Member
- Location
- Miami Fla.
- Occupation
- 60 yr old tool twisting electrician
Welcome sparkyI.sparkyI said:
Sure this is right?
bphgravity
Senior Member
- Location
- Florida
What is your calculated load? Are their any correction or adjustment factors to consider? Will you be limiting voltage drop?
chris kennedy
Senior Member
- Location
- Miami Fla.
- Occupation
- 60 yr old tool twisting electrician
sparkyI said:
Somethings wrong here Bryan, if OP meant 480/277 that genny will produce around 1400A. You got a 400A breaker that complies with 230.95???
micromind
Senior Member
- Location
- Fernley, NV. (near Reno)
For 400KVA at 480/277, I came up with 481 amps. At 208/120, it's 1111 amps.
Quite likely, it's a 10 lead gen, meaning wye connection only. If it's connected as a series wye, the output will be 480/277, or 416/240. Depends on where the regulator is set. If it's connected as a parallel wye, it'll be 240/138, or 208/120.
A 400 amp breaker is a tad small for this gen, but there's nothing wrong with it. As far as wire size goes, it depends on whether it's copper or aluminum, single or parallel, etc. At 200', voltage drop won't be much of an issue at 480, at 208 it might be.
To give an accurate size, we need more information. In addition to the above, where is this 400 amp breaker located? Is it on the gen itself, or 200' away, at the load? Or maybe there are two breakers, one on the gen, and one at the load.
Rob.
Quite likely, it's a 10 lead gen, meaning wye connection only. If it's connected as a series wye, the output will be 480/277, or 416/240. Depends on where the regulator is set. If it's connected as a parallel wye, it'll be 240/138, or 208/120.
A 400 amp breaker is a tad small for this gen, but there's nothing wrong with it. As far as wire size goes, it depends on whether it's copper or aluminum, single or parallel, etc. At 200', voltage drop won't be much of an issue at 480, at 208 it might be.
To give an accurate size, we need more information. In addition to the above, where is this 400 amp breaker located? Is it on the gen itself, or 200' away, at the load? Or maybe there are two breakers, one on the gen, and one at the load.
Rob.
generator feeder size
Sorry, wrong info. 200kva generator feeding a 400 amp 3-phase 480volt breaker after the dissconnect. I am going to run the feeders in parallel a distance of 200' between the breaker on the gen and the breaker in the panel. Like to know what size feeders should be ran.
Sorry, wrong info. 200kva generator feeding a 400 amp 3-phase 480volt breaker after the dissconnect. I am going to run the feeders in parallel a distance of 200' between the breaker on the gen and the breaker in the panel. Like to know what size feeders should be ran.
hdpeng
Member
- Location
- Acworth, GA
2-Sets of 3/0
2-Sets of 3/0
2-Sets of 3/0
2-sets of 3/0 carrying 400A @ 480V/3-phase will give you approx. 1.36% voltage drop @ 200', but a 200kVA/0.8 PF/3-phase generator's rated output is only about 241A @ 100%. It sounds as if the generator is undersized for the load.sparkyI said:
- Location
- Massachusetts
sparkyI said:
Forget about the breaker size at the panel, that is really not relevant.
What is the calculated load?
What size breaker is on the generator it self?
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