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-   -   Grounding a Cut-off Box (http://www.diychatroom.com/f18/grounding-cut-off-box-30221/)

capt2 10-19-2008 07:14 PM

Grounding a Cut-off Box
 
I have to change the grounding at my house. What I plan to do is install a second ground rod, which I'll connect to the first existing ground rod, then to the panel and the incoming cold pipe.

My problem is that the outside 200A cutoff box is presently attached, via its ground bus, to the cold water pipe.
Is this where it's supposed to go????
If not then where?? What's the code on this?

Thanks in advance

chris75 10-19-2008 07:22 PM

Quote:

Originally Posted by capt2 (Post 174135)
I have to change the grounding at my house. What I plan to do is install a second ground rod, which I'll connect to the first existing ground rod, then to the panel and the incoming cold pipe.

My problem is that the outside 200A cutoff box is presently attached, via its ground bus, to the cold water pipe.
Is this where it's supposed to go????
If not then where?? What's the code on this?

Thanks in advance

WHy do you need to touch the grounding at your house when you dont understand it to begin with?

Termite 10-19-2008 07:46 PM

Chris makes an excellent point...
If you've added something to your home's electrical system, you need the oversight of a professional that understands the answer to the question you're asking. Someone needs to look at the work to make sure it is safe.

Why do you have to change the grounding at your house?

If you have a main disconnect, that is where all your grounding and bonding takes place. The water line and driven rod's grounding electrode conductors originate at the main and go straight to the electrodes...Never to a downstream panel. The green bonding screw should be installed at the main disconnect.

Your panel(s) are effectively subpanels, and should therefore not have any grounding electrode conductors originating from them or going into them. The neutrals and grounds MUST be isolated, and NEVER bonded together. No green bonding screw either.

Don't think that you're doing yourself any favors or increasing the level of safety by adding grounds from subpanels. Quite the opposite.

capt2 10-20-2008 02:29 AM

Quote:

Originally Posted by thekctermite (Post 174150)
Why do you have to change the grounding at your house?


Don't think that you're doing yourself any favors or increasing the level of safety by adding grounds from subpanels. Quite the opposite.

Here's the deal.....I'm upgrading. I'm putting in a standby generator, already have a permit, and was told by the AHJ to make sure all my panel grounds were correct as part of the process.

Termite 10-20-2008 08:38 AM

I've never seen a DIYer install a generator or the associated transfer gear. That is a big, complex job. Done incorrectly, a generator can backfeed the power service in an outage and can easily kill a lineman.
Grounding is the easiest part of that job.

joed 10-20-2008 08:51 AM

Your main grounding is connected to the first disconnect after the meter. It sounds like all your gounding should be done in the main 200 disconnect outside. Everything after that is connected using a four wire feed and the neutral and ground are kept completely separate.

chris75 10-20-2008 02:50 PM

Quote:

Originally Posted by joed (Post 174265)
Your main grounding is connected to the first disconnect after the meter. It sounds like all your gounding should be done in the main 200 disconnect outside. Everything after that is connected using a four wire feed and the neutral and ground are kept completely separate.

Unless of course his transfer switch switches the grounded conductor. :whistling2:

capt2 10-20-2008 06:17 PM

Quote:

Originally Posted by thekctermite (Post 174260)
I've never seen a DIYer install a generator or the associated transfer gear. That is a big, complex job. Done incorrectly, a generator can backfeed the power service in an outage and can easily kill a lineman.
Grounding is the easiest part of that job.

THis is my 2nd gen set installation. The other was working under a master. Stand by units are not difficult once you know what's what,
Including backfeed prevention which is built in with Guardians 7k and up.
I admit oddly though, main cuttoff brkrs were GREEK to me. I think I understand them now.

Thank you for all the replies

chris75 10-20-2008 07:33 PM

Quote:

Originally Posted by capt2 (Post 174496)
THis is my 2nd gen set installation. The other was working under a master. Stand by units are not difficult once you know what's what,
Including backfeed prevention which is built in with Guardians 7k and up.
I admit oddly though, main cuttoff brkrs were GREEK to me. I think I understand them now.

Thank you for all the replies

I glad you fully understand Art. 702 just by watching 1 generator get installed... :) Best of luck to ya.

Cow 10-20-2008 09:25 PM

Quote:

Originally Posted by chris75 (Post 174526)
I glad you fully understand Art. 702 just by watching 1 generator get installed... :) Best of luck to ya.

3 posts from Chris in one thread...... and none of them worthwhile. With Chris' attitude you'd have thought he was asking how to backfeed a dryer recep.

Apparently, it's DIYChatroom, "where you can ask any question, except how to properly ground a service."

He's got a permit, it's getting inspected, what's your hang up? Would you rather he not ask questions?

chris75 10-20-2008 10:27 PM

Quote:

Originally Posted by Cow (Post 174570)
3 posts from Chris in one thread...... and none of them worthwhile. With Chris' attitude you'd have thought he was asking how to backfeed a dryer recep.

Apparently, it's DIYChatroom, "where you can ask any question, except how to properly ground a service."

He's got a permit, it's getting inspected, what's your hang up? Would you rather he not ask questions?


His first question made no sense, so yeah, i'm curious how he's going to pull this install off.

Termite 10-20-2008 10:43 PM

Cow, sometimes professionals feel it is negligent to give advice on some DIY installations if they/we feel that the OP is biting off more than they can chew. Sometimes it is more responsible to not answer the question, or to recommend seeking a professional electrician's in-person assistance. Based on the basic grounding question, there is reasonable doubt here.

Sadly...And I can't believe I'm saying this...Sometimes getting inspections doesn't guarantee that you'll get a correct job in the end. The town I live in is a fine example of that. Sometimes the inspector is a master of what he does, sometimes he's not.

You'll never see me giving advice to anyone who's DIY project involves installing a generator and transfer gear themselves, whether I feel they're able or not. Improperly installed generators don't just endanger the home's occupants, they kill unsuspecting lineman that think they're working on a dead power line. Not a DIY project in my opinion.

Although Chris may seem a little harsh and hasn't offered any direct advice, I feel he has what he feels is the OP's best interest in mind.


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