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n175h 03-17-2013 08:47 AM

building new house 200' from meter
 
My son is building a new home on 12 acres. He wants to locate his house about 200' from the POCO meter. The property came with a 200a main panel with a 200 main breaker on a riser at the meter. It has feed through lugs to send to the house.

Two things holding this idea up. Voltage drop and price of wire. I figured on using 4/0 Thwn wire in conduit under ground at $5ftx3:eek:. Not sure about the voltage drop. Will it work?


He may have to move the house closer.

AllanJ 03-17-2013 09:17 AM

For voltage drop purposes (3%) you need 1/O copper or 3/O aluminum.

(Lose no more than 8 volts out of 240 at 200 amps, resistance over 400' round trip must be less than 0.04 ohms)

But in this specific situation you don't have to be concerned about voltage drop because you need yet larger wire for 200 amps over any distance, namely 2/O copper or 4/O aluminum.

The numbers I copied off the web for the equipment grounding conductor (4'th wire) is 4 gauge, for grounding electrode conductors to ground rods 6 gauge, and for GEC to water pipe 3 gauge (use 2 gauge), (copper for the 200 amp service).

joecaption 03-17-2013 09:23 AM

#1 Please go back and add your location to your profile!
Just go to Quick links to edit.

No clue how it works there but around here the power company will run a line from the pole to the house for free within limits, and the meter base is mounted to the side of the house not on a pole 200' away.

brric 03-17-2013 11:02 AM

Quote:

Originally Posted by AllanJ (Post 1139280)
For voltage drop purposes (3%) you need 1/O copper or 3/O aluminum.

(Lose no more than 8 volts out of 240 at 200 amps, resistance over 400' round trip must be less than 0.04 ohms)

But in this specific situation you don't have to be concerned about voltage drop because you need yet larger wire for 200 amps over any distance, namely 2/O copper or 4/O aluminum.

The numbers I copied off the web for the equipment grounding conductor (4'th wire) is 4 gauge, for grounding electrode conductors to ground rods 6 gauge, and for GEC to water pipe 3 gauge (use 2 gauge), (copper for the 200 amp service).

1/0 Cu and 3/0 aluminum are NEVER sufficient for a 200 amp service.

stickboy1375 03-17-2013 11:18 AM

Quote:

Originally Posted by n175h (Post 1139261)
My son is building a new home on 12 acres. He wants to locate his house about 200' from the POCO meter. The property came with a 200a main panel with a 200 main breaker on a riser at the meter. It has feed through lugs to send to the house.

Two things holding this idea up. Voltage drop and price of wire. I figured on using 4/0 Thwn wire in conduit under ground at $5ftx3:eek:. Not sure about the voltage drop. Will it work?


He may have to move the house closer.

I probably wouldn't sweat it pulling the 4/0 AL. at 200', you will need another disconnect at the structure and another grounding electrode system. (i.e, ground rods, uffer, etc...) You will need 4 conductors going to from the meter to the house as well....

flasherz 03-17-2013 11:24 AM

Quote:

Originally Posted by brric (Post 1139356)
1/0 Cu and 3/0 aluminum are NEVER sufficient for a 200 amp service.

Tell that to my power company who used 2/0 AL when they built the house. To be fair, they only used a 15 kVA transformer, so it was highly likely they'd smoke it first.

When we did an upgrade to 320 service, they were a bit surprised I didn't have light dimming problems or other voltage problems, but said that 2/0 AL was what a lot of homes were provisioned with in the late 80's, early 90's.

stickboy1375 03-17-2013 11:29 AM

Quote:

Originally Posted by flasherz (Post 1139382)
Tell that to my power company who used 2/0 AL when they built the house. To be fair, they only used a 15 kVA transformer, so it was highly likely they'd smoke it first.

When we did an upgrade to 320 service, they were a bit surprised I didn't have light dimming problems or other voltage problems, but said that 2/0 AL was what a lot of homes were provisioned with in the late 80's, early 90's.

They dont have to abide by the NEC, and you'll always get dimming with high amperage motors starting. People think because you have a 200 amp service, that must be how much the house draws, a good reality check is that you probably have about 30 amps per leg at any given time, probably less.

Kyle_in_rure 03-17-2013 12:16 PM

Quote:

Originally Posted by joecaption

No clue how it works there but around here the power company will run a line from the pole to the house for free within limits, and the meter base is mounted to the side of the house not on a pole 200' away.

My thoughts exactly....

stickboy1375 03-17-2013 12:21 PM

Quote:

Originally Posted by joecaption (Post 1139286)

No clue how it works there but around here the power company will run a line from the pole to the house for free within limits, and the meter base is mounted to the side of the house not on a pole 200' away.

Quote:

Originally Posted by Kyle_in_rure (Post 1139413)
My thoughts exactly....

The power company will supply wire up to the meter, we do a lot of pedistal services where I live, people just do not want to look at a meter on the side of a house, and when you have money, you get what you want.

n175h 03-17-2013 03:45 PM

Quote:

Originally Posted by joecaption (Post 1139286)
#1 Please go back and add your location to your profile!
Just go to Quick links to edit.

I didn't know I could do that. I put in some info.

n175h 03-17-2013 03:47 PM

Quote:

Originally Posted by stickboy1375 (Post 1139375)
I probably wouldn't sweat it pulling the 4/0 AL. at 200', you will need another disconnect at the structure and another grounding electrode system. (i.e, ground rods, uffer, etc...) You will need 4 conductors going to from the meter to the house as well....

I was thinking CU, thus the high price. I expected the rest of the needed gear you listed. So, 4/0 AL will suffice?

stickboy1375 03-17-2013 06:59 PM

Quote:

Originally Posted by n175h (Post 1139520)
I was thinking CU, thus the high price. I expected the rest of the needed gear you listed. So, 4/0 AL will suffice?

I have no idea if the 4/0 AL will suffice or not, without the sq. footage of the structure or the load calculations, your guess is as good as mine, 4/0 AL is the minimum, with that said, why not just go with 250 AL? This wont be a huge price increase and probably put your mind at ease if you made the right decision.

Speedy Petey 03-18-2013 06:04 AM

I NYS we have to supply EVERYTHING for an UG service, including the transformer pad. The utility supply the transformer and meter themselves.

IMO 4/0AL is FINE, depending on how much secondary is ahead of the meter pedestal.

stickboy1375 03-18-2013 06:11 AM

Quote:

Originally Posted by Speedy Petey (Post 1139896)
I NYS we have to supply EVERYTHING for an UG service, including the transformer pad. The utility supply the transformer and meter themselves.

I've been working in New York a lot now, and the utility requirements are so different from Connecticut POCO requirements... we actually got called back because we didnt terminate the LINE side of the UG meter connections to their requirements. :)


Quote:

Originally Posted by Speedy Petey (Post 1139896)
IMO 4/0AL is FINE, depending on how much secondary is ahead of the meter pedestal.

I'm really fine with the 4/0 AL. as well... I seriously doubt it will be an issue.

rrolleston 03-18-2013 07:56 AM

Quote:

Originally Posted by n175h (Post 1139261)
I figured on using 4/0 Thwn wire in conduit under ground at $5ftx3:eek:..

Bury some Conduit and pull some 300mcm with a 4/0 neutral and a #2 ground. Should be able to get some 300 feeder wire with stepped down neutral and add a #2 use wire for a ground.


But if your not running a lot of large loads 4/0 should be fine.


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