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OT - (Electrical) I like beating dead horses...

J

Jared-IN

Member
Just one quick electrical questions as I have poured over all the other posts and may have missed it, there's a lot on grounding out there.

Do I need to put a ground rod in the ground and tie that into a subpanel located in the same building as the main panel? I know I need to run 4 wires over to the subpanel, but do I need to run a wire to ground as well?

Thx
 
You must have a seperate ground bar (bar with set screws that the ground wires go to) and the Neutral bar must not be bonded to the frame of the sub panel (look for a screw that goes through the Neutral bar and threads into the box)
No ground rod required.
Chris
 
Yes.
Run four wires, drive ground rods/bury plates and open the connection between the remote panel's neutral bar and ground bars.
The ground cable from the supply panel, the remote panel's ground bar and the remote panel's ground rods need to be connected together.
Good to hear about somebody that wants to do the job right instead of "just make work".
 
Depends on the code where you live. In reality, if practical all grounds should be bonded together> Rationale: The potential from a lightening strike between two separate grounds can be twice as great as one ground. The distance between grounds greater than a few feet away however is not practical. The size of the bond (wire) between them will have to be too large to be practical in order to reduce the resistance to prevent excess current through the bond. Example Telephone, TV, and power entrances should be adjacent to one another and all bonded to a single ground rod. If it is on the order of 20' away for example a # 2 AWG copper wire would be required between the two grounds. Of course two different power sources would be no different.
 
So I can have a main panel grounded with a rod in the ground and then 40' away in the same building have a sub panel connected to that main panel and the sub panel doesn't need to have a ground rod put in for it as well?
 
You need to understand what you are doing instead of just going thru the motions of doing it. No one can advise you on safe and proper electrical design or installation over the internet. Please either hire someone qualified to do the work or guide you in person. Just some advice from a licensed electrical contractor.
 
My understanding is the 4th wire does the grounding, wouldn't need another rod?

I'm just a farmer, others who know better seem to say you do in some cases?

--->Paul
 
Ever seen a house or tree that was hit by lighting Believe me there ain't much hope for anything coming out of it safe. We are not talking 220 volts we are talking 1000s of volts and plenty of amps behind it.
Walt
 
Well you sure got a bunch of opinions on that question. I would rely on the National Electrical Code book. Virtually all cities use it as a basis, virtually never reducing it's requirement, but sometimes making additional requirements that do not violate NEC.
On your question, NEC is clear that a sub-panel is to be tied to the building main service panel ground and a separate or additional ground rod is not required and is in fact not to be used.
 
John T added a message to you about a page ahead of this thread.

It would seem no, you do not need a seperate ground rod as long as this is the same building. You understand you _do_ need a seperate ground wire feeding back to the main box of the building - typically 4 wires for a 220v setup?

--->Paul
 
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