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Old 08-31-2013, 01:08 PM   #1
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Installing Power Pedestal

I am building an RV pad, complete with hook-up’s next to my home. I purchased the below 50A power pedestal from RVpoweroutlet.com. The bottom of the pedestal is to be buried 24" below ground. I will be pouring concrete around the pedestal, which raises a question I have for those of you that are more knowledgeable than me about electricity. Can I pour concrete around/against the base of the exposed pedestal, or should I leave a dirt gap? I see these things encased in concrete at CG’s all the time, so I’m assuming it is safe to do so (?).

Thanks.

Craig

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Old 08-31-2013, 01:26 PM   #2
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Craig, Hello, If I was doing it I would get some of that spray rubber and spray it up to or just above the ground level to protect the steel beyond the paint.(ruff it up before coating it) and then pour against it and finish around it, the concrete won't stick to the rubber and if you ever have to remove it you will be able to.
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Old 08-31-2013, 01:43 PM   #3
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I assume you will plan to run conduit under the slab and route the cable up into the enclosure via conduit. I certainly would not pour concrete around the metal enclosure unless you have conduit in place.
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Old 08-31-2013, 01:49 PM   #4
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Interesting idea re: the sealant spray. If they make it in a gray color, I might just do that.

Yes, I will definitely be burying the electrical in conduit.

Craig
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Old 08-31-2013, 04:14 PM   #5
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Originally Posted by Craig P. View Post
Interesting idea re: the sealant spray. If they make it in a gray color, I might just do that.

Yes, I will definitely be burying the electrical in conduit.

Craig

Make sure the conduit is oversized for cooling and any future rewiring!!
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Old 08-31-2013, 04:18 PM   #6
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Make sure the conduit is oversized for cooling and any future rewiring!!
Good idea, thanks.

Anyone have a reply to my pedestal base question?

Craig
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Old 08-31-2013, 04:31 PM   #7
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Quote:
Originally Posted by Craig P. View Post

Good idea, thanks.

Anyone have a reply to my pedestal base question?

Craig
Yes it's safe, I would still coat it first to ward off future rust/corrosion.
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Old 08-31-2013, 05:42 PM   #8
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Power pedestals are normally grounded to "earth". If you encase your pedestal in cement, a ground rod needs to be driven in and connected to the pedestal. Cement is not a good conductor of electricity.

I'm pretty sure that the NEC (National Electrical Code) requires bonding to Earth at the pedestal.

To prevent confusion, your electrician will wire your pedestal with a 3-wire direct burial cable if your pedestal is grounded properly. Wire gauge dependent of course on distance. Ensure that you specify to your electrician that you want a 4-wire, 50 amp, 220 volt service at the new pedestal. In case I am creating confusion, you are bringing in 3 conductors in the new cable and the 4th wire is the new ground you created with the ground rod.
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Old 08-31-2013, 05:48 PM   #9
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You can pour concrete around that. As others have said, I'd put some extra protectant on it. If it were ME, I'd leave a square opening in the concrete for it and fill it with gravel. I'd bring my water up through the opening as well.
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Old 08-31-2013, 06:33 PM   #10
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Earth ground?

Quote:
Originally Posted by ruffian View Post
Power pedestals are normally grounded to "earth". If you encase your pedestal in cement, a ground rod needs to be driven in and connected to the pedestal. Cement is not a good conductor of electricity.

I'm pretty sure that the NEC (National Electrical Code) requires bonding to Earth at the pedestal.

To prevent confusion, your electrician will wire your pedestal with a 3-wire direct burial cable if your pedestal is grounded properly. Wire gauge dependent of course on distance. Ensure that you specify to your electrician that you want a 4-wire, 50 amp, 220 volt service at the new pedestal. In case I am creating confusion, you are bringing in 3 conductors in the new cable and the 4th wire is the new ground you created with the ground rod.
As the OP satate and by the photo........24" of this power panel goes into the ground and the cement I would guess would be 6" max. A grounding rod should also be installed though.
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Old 08-31-2013, 07:00 PM   #11
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As the OP satate and by the photo........24" of this power panel goes into the ground and the cement I would guess would be 6" max. A grounding rod should also be installed though.
A proper ground rod is driven at least 48" deep and is copper or copper clad.
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Old 08-31-2013, 07:33 PM   #12
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Thanks everyone for your replies. As stated, the pedestal will be buried 24" into the ground before concrete is poured. I will tell my electrician to make sure he adds a copper clad ground rod to be on the safe side. He is aware that I need 50A, 220V service. I showed him the specs on the pedestal before I ordered it. I will also ask him about the wire before he starts.

I like the idea of framing out the pedestal/water opening in the concrete and adding gravel. This would make any repairs to the pedestal and water line much easier, should that ever become necessary.

Thanks guys!

Craig
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Old 09-01-2013, 12:32 PM   #13
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The only issue I see with "Set in Concrete" is if you ever need to replace it.. Jackhammer will be needed.

That said.. Not that much jackhammering will be needed so I'd go ahead and set it in.

By the way, your decision to put in 50 amp service.

That.. is one I support, strongly.
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Old 09-01-2013, 12:37 PM   #14
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Quote:
Originally Posted by Craig P. View Post
Thanks everyone for your replies. As stated, the pedestal will be buried 24" into the ground before concrete is poured. I will tell my electrician to make sure he adds a copper clad ground rod to be on the safe side. He is aware that I need 50A, 220V service. I showed him the specs on the pedestal before I ordered it. I will also ask him about the wire before he starts.

I like the idea of framing out the pedestal/water opening in the concrete and adding gravel. This would make any repairs to the pedestal and water line much easier, should that ever become necessary.

Thanks guys!

Craig
And the ground rod should not be encased in concrete in accordance with NEC rules.

Bart Anderson
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