woodlot
Gold Member
flusher said:
What was the cost to do that??? Man, I sure wouldn't announce that in public, you'll have those unruly copper theives digging up your yard. You sure thats not AL wire?
Electric service to barn
- Thread starter fishpick
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What was the cost to do that??? Man, I sure wouldn't announce that in public, you'll have those unruly copper theives digging up your yard. You sure thats not AL wire?
Cliff_Johns
Elite Member
flusher said:
So,
for 200A @ 330 ft, you're using 4/0 Copper
for 100A @ 170 ft, you're using 2/0 Copper
That seems backwards to me?
Cliff
LoganWildman
Silver Member
Cliff,
Why would that be backwards? 4/0 is bigger in diameter than 2/0 so that would be appropriate for the additional current me thinks.
Alan
Why would that be backwards? 4/0 is bigger in diameter than 2/0 so that would be appropriate for the additional current me thinks.
Alan
6sunset6
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well I did this all new 11 years ago. Brought down 7800v primery underground to an on the ground transformer. 400amp meter pan on a panel feeding 2 200 amp outdoor breakers. One for the house, one for the barn. They asked me why, I said if the barn burns down ,shut off the breaker and I can still live in the house. As a vol fireman I learned all about cut off all power to a burning building immediatly. It does not get turned back on so fast. The secondary feeds to both buildings was 4/0 aluminum in 3" plastic conduit. The primery was the strangest thing I ever saw ,single core #2 alum with about 1" of insulation around it and seven bare # 12 alum wires wrapped around that. Turns out the return is earth ground . Transformer takes 1 phase 7800vac and makes 2 phases 180d apart 220 to each other and 110 to ground common with neutral. Did everything myself except set the ground transformer and hook the other end of the primery to the pole out on the road. I am 600 ft off the road. voltage drop at load was too much for 220,hence the 7800 volt primery. I think you can oversize the wire to handle the drop if the drop is not too much, but 600 ft is a lot.
LBrown59
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What size wire are you going to use for that?Eric_Phillips said:
OP
fishpick
Platinum Member
I talked to my local "expert" here (Crown Electric) after the utility told me (and I thank NYSEG for the honesty) - "You are nuts to put in dedicated service - at commercial rates - but we would be more than happy to do it for you!"
So - here's what I'm planning on - 100AMP breaker in the main panel in the house (honestly didn't know they went bigger than 50 in the double throw configuration - cool!)... 2/0 for the run from the breaker to the barn (about 150' +/- 30 feet) - outside it will be inside 2" conduit... 3 wire run - 2 hots and 1 neutral.
In the barn - there will be a copper ground line run to 2 - 6' grounding rods - 6' apart with a continuous loop back to the sub-panel.
Obviously 100 A sub - with both 220 and 110 circuits off of it.
Only question I have left (right now) is - anything wrong using a 100A "main panel" from Lowes as the sub... they have a deal right now on a scratch and dent unit that comes with 4 - 20A breakers... or - must a sub be a sub?
So - here's what I'm planning on - 100AMP breaker in the main panel in the house (honestly didn't know they went bigger than 50 in the double throw configuration - cool!)... 2/0 for the run from the breaker to the barn (about 150' +/- 30 feet) - outside it will be inside 2" conduit... 3 wire run - 2 hots and 1 neutral.
In the barn - there will be a copper ground line run to 2 - 6' grounding rods - 6' apart with a continuous loop back to the sub-panel.
Obviously 100 A sub - with both 220 and 110 circuits off of it.
Only question I have left (right now) is - anything wrong using a 100A "main panel" from Lowes as the sub... they have a deal right now on a scratch and dent unit that comes with 4 - 20A breakers... or - must a sub be a sub?
mudcat
Platinum Member
fishpick said:
Nothing wrong with that.
podagrower
Silver Member
fishpick said:
One thing I can never remember on suppling power to a separate building on the same property is whether you have to pull in a ground wire also--but it looks like you have this covered with the ground rods. As far as using a "main panel" is concerned, I would suggest to make sure it has a main breaker installed. Some panels have a main breaker factory installed, some are main convertable ( you buy a main breaker that bolts in ), but even if this is not available with the panel you are looking at, you can put in a breaker (100a in this case) and "back-feed" it. That means landing the wires in the lugs of that breaker so that it can limit the current flowing to the panel (or eliminate it in case of a big problem).
In any case, the helpful people at Lowes should be able to show you what you need to do.
Sully2
Veteran Member
fishpick said:
Home depot has been selling 20 slot Square-D boxes...with a 100 amp main in them AND 5...20 amp 120 breakers included for $58. I just bought one 2 weeks ago.
You dont NEED conduit the full length of your run. I used direct burial (#4 in my case) and ran it in conduit until I got away from the house and deep enough underground..and then ran it in an open trench. Bonded the box to a single ..8 ft long grounding rod driven down to within a foot of being totally buried.
Cliff_Johns
Elite Member
LoganWildman said:
Sorry, I was thinking 4 or 2 AWG. I was thinking that mostly because I would have thought that for 100A @ 170 ft, would have been #2 (or maybe #1), not 2/0 in Copper. I'm not knowledgeable about these things, but 2/0 seems like a lot of extra copper. Does going 170 feet really drop that much to make you go to 2/0?
In any case, it's my mistake,
Cliff