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Old 07-26-2016, 04:06 PM   #15
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It doesn't hurt anything to have a ground rod whether you need it or not.

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Old 07-26-2016, 04:31 PM   #16
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30a outlet at the RV dock.

Here is a good read on grounding and bonding sub-panels.
http://www3.ambest.com/DPSDirectoryS...shx?mmid=12761

It may not fully apply to an RV outlet but the principles are still true. In particular how the neutral is handled on sub-panels.


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Old 07-27-2016, 05:13 AM   #17
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Thanks for the input guys. The read on wiring the sub-panels was good and understandable, much appreciated.
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Old 09-29-2016, 04:40 PM   #18
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I know it's been a while but because of many things between my last post and today I have not gotten to wire this and I have made a change to my plan that I would like to run by everyone...

At the main panel (I have 100a service)
1. replace 2 15a CBs with a single position dual 15a CB
2. install a 30a CB in the newly recovered slot
3. run about 30' of #10/2 UF-B to a remote outdoor outlet box with 120v,30a receptacle installed

Do I have to bury the UF-B wire or can I run it along my foundation to the back of the parking spot and mount the box on the Pressure Treated wall?
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Old 09-29-2016, 04:55 PM   #19
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I just did this for mine. Not sure why you wouldn't bury it.
Lowes sells the 30Amp box with receptacle installed.
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Old 09-29-2016, 05:09 PM   #20
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Quote:
Originally Posted by grumpy_g View Post

Do I have to bury the UF-B wire or can I run it along my foundation to the back of the parking spot and mount the box on the Pressure Treated wall?
My advice is that if it's not buried then it needs to go into a conduit to protect it from getting accidentally bumped or torn which could cause an electrical hazard.

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Old 09-29-2016, 06:21 PM   #21
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I can bury it then, and I bought a similar box, but from Home Depot.
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Old 09-30-2016, 06:51 AM   #22
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Our area would allow bury if xx" deep (I cant recall the #) but if in conduit, it could be yy" deep (shallower). We had lots of hard gound/rocks so I rented a trencher layed the conduit, had it inspected, then covered it up.
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Old 09-30-2016, 07:14 AM   #23
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If truly a subpanel it should have a ground at the subpanel with neutral separated from the ground at the subpanel (many grounds ok, but only one neutral). If in a separate building must have a disconnect (this can be the main breaker in the subpanel).

If wiring is run around the foundation should be in conduit. If underground can be direct burial cable or in conduit. Depth varies by jurisdiction - where I am in socal is 24" direct burial and 18" in conduit. If 120v branch circuit can be 12" iirc.

If just a 120v 30a circuit for RV I question why a subpanel is needed.
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Old 09-30-2016, 07:23 AM   #24
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If possible, bury conduit large enough to handle wiring for 50 amp service. If you upgrade you won't need to dig again.
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Old 09-30-2016, 07:57 AM   #25
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Thanks to everyone for their time and advice.
As more advice comes in I am revising my plan.

- No sub-panel, will run #10/2 UF-B from a 30a breaker in main panel
- will run through conduit (pvc conduit ok? and can the #10/2 UF-B be run in the conduit? I already have it)
- above ground, attached to outside walls (is this ok? burying seems to present a problem for me)
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Old 09-30-2016, 05:31 PM   #26
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I think I found one answer -
that is do not run the UF-B outdoor cable in a conduit as it may/will cause the wires to overheat.
As long as this type of cable is off the ground, against a wall and not situated where it can get damaged it doesn't have to be buried either.
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Old 09-30-2016, 05:57 PM   #27
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Quote:
Originally Posted by knightstorm View Post
If possible, bury conduit large enough to handle wiring for 50 amp service. If you upgrade you won't need to dig again.
This is what I did when I installed my 30a RV connection. Agree, good idea if possible.
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Old 09-30-2016, 06:01 PM   #28
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UF in conduit is ok.

If outside, I would either direct bury or place in conduit.

As for digging the trench I find it easy to do. Just hire a day labor to do the dig. I have dug several this way. (-:
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