Subpanel for an unattached building

EntlebucherDecember 1, 2011

I would like to install a subpanel in an out building. I plan on running individual conductors in PVC conduit. Can I run 2 hot leads and a neutral to the subpanel and use a ground rod at the out building instead of running a ground wire in the conduit?

Thank you for reporting this comment. Undo
Ron Natalie

Depends what version of the electrical code your jurisdiction is operating under. Frankly, it is a very very good idea to do so even if you're on one of the older codes anyway.

If you're running more than one circuit in the outbuilding you will require a grounding system (which is probably more than ONE ground rod).

    Bookmark   December 1, 2011 at 6:11PM
Thank you for reporting this comment. Undo
petey_racer

I wouldn't think there is any area left in the US still under the 2005 NEC, which allows the use of the neutral to also serve as the ground in some cases like this.

Entlebucher, you need two hots, a neutral AND an equipment ground conductor.
A ground while is required in either case, but has nothing to do with equipment grounding. It does not take the place of one nor does it serve nearly the same purpose.

    Bookmark   December 1, 2011 at 8:26PM
Thank you for reporting this comment. Undo
Ron Natalie

Missouri (other than St. Louis),DC, Utah, and Connecticut appear to still be on 2005. Many of the major cities in areas that haven't got statewide adoption are still there: including Tuscon, Springfield, IL, most of Maine, a good deal of Maryland, etc...

That being said, if you have any metallic connections to the building other than the power, you can't use the exemption either. As I stated, even if you qualify (old code, no other metallic paths) it's still a really, really, good idea to run the ground between the structures.

    Bookmark   December 2, 2011 at 1:31PM
Thank you for reporting this comment. Undo
btharmy

Don't forget to drive 2 ground rods at least 6ft apart as well. That is unless you can verify that the resistance to ground from only one rod is within specs.

    Bookmark   December 3, 2011 at 11:34PM
Thank you for reporting this comment. Undo
dkenny

why not run all 4 wires?
and a ground rod for the ground near the remote panel.

running all 4 wires will guarantee the voltages will in reference to each other. and all the conductors that are intended to carry current--carry current. and those that aren't supposed to carry current DON'T.

the additional ground rod will add to the lightning protection...what happens if a bolt hits your out building..what's the current path to ground? back up the wire to your house? might not be a good plan.

-dkenny

ps..it it were me..i'd run 4 wires out to the out building.
but that's me.

    Bookmark   December 4, 2011 at 12:05AM
Thank you for reporting this comment. Undo
Ron Natalie

Thank you Dkenny. You just got around to saying exactly what I said in the very first post. One rod itself is not likely to be an effective and legal ground.
It's highly advisable to run the grounds between the buildings. However, to assuage the pedantic here, there are still large chunks of the country that in certain situations you can legally get away with not running it. The major reason to do so would be COST.

    Bookmark   December 4, 2011 at 7:55AM
Sign Up to comment
More Discussions
Goodbye Phone Jack: what to do with wires?
We want to remove this phone jack. It's in a useless...
maggiepatty
Bath fan/light combo
Attached is wiring diagram of masterbath (I hope I...
jaspol
Garage florescent light flickering - bulb or fixture problem?
I replaced the GE F40 RES garage lights with a GE F40...
bibbus 7b
Grounding Service panel 200amp
Is the new NEC saying to no longer run # 4 copper wire...
36066
Disposer Power Cord
I recently bought a GE disposal online. The model is...
africanboy
Sponsored Products
Versailles Canister Set
$49.99 | zulily
Armen Living Punjab Ottoman - LCPUOTAL
$242.32 | Hayneedle
Stanley Coastal Living Resort Tranquility Isle Telephone Table Sea Oat 062-63-81
$699.98 | Hayneedle
Mosaic Tile: Merola Tile Building Materials Spectrum Square Ligoria 11-1/2 in.
$7.97 | Home Depot
Homestyle Capri 32x80-inch White Folding Door
Overstock.com
Vintage Icons Personalized Wall D├ęcor
$34.99 | zulily
© 2015 Houzz Inc. Houzz® The new way to design your home™