paralleled conductors
- Thread starter 101010
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masterinbama
Senior Member
- Location
- Huntsville Alabama
I would use the 600's. The extra time and effort to set up and pull 4 more wires is not worth it. IMHO
Depending on 3 wire or 4 wire service you would need to derate the 4/0's to 80% or 70%
neither add up to 400amps.
What am I missing. 4/0 THHN/THWN-2 260 x .8 = 208 x 2 = 416
chris kennedy
Senior Member
- Location
- Miami Fla.
- Occupation
- 60 yr old tool twisting electrician
I'm surprised no one has mentioned one set of 500's. What is the calculated load? BTW that is what I would pull.
- Location
- Massachusetts
I priced out one set of 600 copper in one raceway vs two sets of 3/0 copper in two raceways and the two sets was cheaper by a large factor.
Labor was close to the same as the runs would have been mostly straight on a flat roof.
I needed at least 400 amps.
Labor was close to the same as the runs would have been mostly straight on a flat roof.
I needed at least 400 amps.
- Location
- Massachusetts
It was and I could have explained myself better when I said I needed 400 amps.
I started with 100 F and went with the 40 F adder. along with the double 125% that PV systems require, I can not remember what the 'real' load was but it was not very high at all.
Sorry Gus I was using the 75deg column, but, to save face just a little if it was a 4 wire
system @ 70% derating = 364amps.
It was and I could have explained myself better when I said I needed 400 amps.
I started with 100 F and went with the 40 F adder. along with the double 125% that PV systems require, I can not remember what the 'real' load was but it was not very high at all.
I figured you had it covered, sorry
Frank, not challenging you, and you are correct, curious, how often have you seen a service with a major portion of the load nonlinear ?
That's not intended to be "smart alec", but I often wonder. I don't recall ever seeing one.
That's not intended to be "smart alec", but I often wonder. I don't recall ever seeing one.
- Location
- Illinois
- Occupation
- retired electrician
As long as the load calc showed a load of 364 amps or less, you would still be ok.
Gus,
That has got to be the nicest way I have ever been told I was wrong, and I am wrong
so much for saving face
, and thanksIt was and I could have explained myself better when I said I needed 400 amps.
I started with 100 F and went with the 40 F adder. along with the double 125% that PV systems require, I can not remember what the 'real' load was but it was not very high at all.
What does that mean?
Pierre C Belarge
Senior Member
- Location
- Westchester County, New York
That is typically what is installed in this neck of the woods. Most 400A services around here do not have much load to them.
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