Electricians, I need your help. Service wire size

[BETTERLUCKYTHANGOOD]

I need the help of the Green Screen Electricians.
I'm getting ready to run the power and water to my shop, I will be running 100 amp service 550 feet. What size wire do I need to run to do this without bad voltage drop?
It will be underground trenched and in conduit. Can't thing of any other info you will need at this point, but please ask if there is any.

Thanks in advance.

[12RingKing]

http://www.paigewire.com/(X(1)S(kerl1hkd2oeozcid23jd2uqo))/pumpWireCalc.aspx?AspxAutoDetectCookieSupport=1

4/0 copper

300MCM aluminum

That’s at 3% and for a full 100A. You can derate based off the NEC. That wire in conduit will be very expensive.

[12RingKing]

If I may make a recommendation, go with aluminum direct burial URD.

https://www.prioritywire.com/specs/Triplex%20Aluminum%20Conductor%20600V%20URD.pdf

If you derate based off the NEC, you could probably use Pratt which is 250 MCM. You can use the previous link and play with the ampacity at the known 1 way distance.

[Hoggslayer]

If I may make a recommendation, go with aluminum direct burial URD.

https://www.prioritywire.com/specs/Triplex%20Aluminum%20Conductor%20600V%20URD.pdf

If you derate based off the NEC, you could probably use Pratt which is 250 MCM. You can use the previous link and play with the ampacity at the known 1 way distance.

Yep, that's a long way to run copper. Aluminum would be the way to go and might leave a little money in the bank.

[BETTERLUCKYTHANGOOD]

If I may make a recommendation, go with aluminum direct burial URD.

https://www.prioritywire.com/specs/Triplex%20Aluminum%20Conductor%20600V%20URD.pdf

If you derate based off the NEC, you could probably use Pratt which is 250 MCM. You can use the previous link and play with the ampacity at the known 1 way distance.

Do they make the 300MCM in a direct burial three wire service cable or do I need to get 3 separate wires and run in conduit?
When I was told 4/0 copper I bout @#%# myself.

[BETTERLUCKYTHANGOOD]

Never mind, the link answered my question. Thanks,

[12RingKing]

Those cables I referenced are triplex. If you need quadruplex, it’s a different cable name.

[db@100]

If it's a sub panel, he needs 4 wires.

[12RingKing]

If it's a sub panel, he needs 4 wires.

You’re correct. Here’s the chart:

https://www.prioritywire.com/specs/Quadruplex%20Aluminum%20Conductor%20600V%20URD.pdf

Also, OP you should note that if you run it in conduit the full length, your maximum ampacity is derated. You’re talking about some big cable and conduit for a 100a service.

If you derate your service to 80% or 80A (not sure what NEC standard is on this off hand) then you would be at 250MCM aluminum. The URD Quadruplex is Rust.

Don’t forget your ground rod at the sub panel and the penetrox aluminum joint compound.

There are a bunch of guys on here who do this for a living that probably have a lot more info than I do, but hopefully this gives you a good direction to begin.

[Dejashoot]

4 wire and no ground rod at the sub (pulling a neutral out to the sub already) is what I was told on mine.

[BETTERLUCKYTHANGOOD]

Thanks for everyone's advice. I'm going with the aluminum, I don't think God himself could afford copper right now. I have a grounding rod at the main panel, gonna run the triplex and put another grounding rod at the shop. This is what I did at my last house, but my distance was no where near this length.
Thanks again for the help guys.

[FLASH_OUTDOORS]

Thanks for everyone's advice. I'm going with the aluminum, I don't think God himself could afford copper right now. I have a grounding rod at the main panel, gonna run the triplex and put another grounding rod at the shop. This is what I did at my last house, but my distance was no where near this length.
Thanks again for the help guys.

Just because you are installing a 100a panel doesn’t mean you need a full 100a out there. Give me a realistic list of stuff you will be using out there. It doesn’t make sense to run a full 100a out there if you only need 30a


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[Bill]

You’re a braver man than I to size and do this yourself. I’d hire an electrician to size, connect and sign-off on any permit/ inspection (or to put in a file if there ever is a future problem and a question if was installed by a licensed electrician) and save money by doing the trenching,running the correct wire and installing the sub panel yourself.

But that’s just me.

Carry on.


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[Wolf_Creek]

Thanks for everyone's advice. I'm going with the aluminum, I don't think God himself could afford copper right now. I have a grounding rod at the main panel, gonna run the triplex and put another grounding rod at the shop. This is what I did at my last house, but my distance was no where near this length.
Thanks again for the help guys.

You need 4 conductors to and no ground rod at the sub panel. No bond screw and separate your neutrals and grounds in the sub panel.

[sideways]

Why do you need 4 wires on a sub panel? Seriously I’m not an electrician.


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