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Evnldr 06-12-2008 08:32 AM

Sub Panel
 
1 Attachment(s)
Ok here is my question.. In the garage i have a Stab-lock Yea i know all about it,, they wired it oddly im replacing it with a Square D QO6-12L100
Now they wired it grounded all the way back to the main panel?
I have pics should i use a ground bar and just use the one in the panel and cut the ground to the box?

She sub panel is grounded stake and ground clamp.. as well as a wire running back to the main panel so it looks

Any info is needed as i have never replaced a sub panel

The 240 or what ever is in the other dual 30 is getting removed as the main line don't look like it has the ability to hold it..

I will add a dedicated 20 for my small compressor

I will add 4 15's and 1 20A total is that ok?

than i will remove all AL wire in time

Thanks Jay





CowboyAndy 06-12-2008 08:43 AM

What size is your feeder coming from the main panel? You mentioned there is a ground wire going to the main panel? I would assume that means that it is XX/3 wire. Your ground and neutral bars in the sub panel need to be seperated.

Evnldr 06-12-2008 08:56 AM

1 Attachment(s)
Actually the Ground is totally separate The feeder is dual 30Amp

See Pic

So Can i remove the Green Ground coming from main and use a ground bar? off the sub panel ground spike?

CowboyAndy 06-12-2008 08:57 AM

Quote:

Originally Posted by Evnldr (Post 129823)
I will add a dedicated 20 for my small compressor

I will add 4 15's and 1 20A total is that ok?

than i will remove all AL wire in time


I would not put all that on a 30. What side wire is the feeder?


ETA: Nvm, I see on the wire it is 10/3.


Can you pull a new wire?

Evnldr 06-12-2008 09:12 AM

No it's burred in conduit

I misspoke i need

3 15's = Lights and recpt's
1 20 = heavy loads

They had 4 circuits on 2 15's and a 240 running at one time

What about my Extra ground Bad or over kill?

:eek:

J. V. 06-12-2008 09:36 AM

Sub panels must be grounded back to the main panel. Four wires. 2 hots, 1 Neutral, and 1 ground. It looks like the black cable on the right side entering the enclosure is the feeder right. There are four wires in this feeder cable. Just get a grounding terminal strip for your panel and move all grounds (bares & greens) to this new bar. From this new bar you will run another bare copper wire to the ground rod or rods. Your existing sub panel is larger than 30 amp. If you only need a couple light fixtures and one 20 amp circuit for small power tools 30 amp will be just fine. But like Cowboy, I always go bigger when doing jobs like this. What size is the conduit from the source to the sub panel? If that black cable is in that conduit, I am certain you can easily upgrade to a larger service. You can keep the existing panel if you decide to upgrade. Remember, no more than 6 breakers in this lug panel. If you excede 6 you will need a main breaker.

Evnldr 06-12-2008 10:01 AM

The black wire is a 240 that will be gone the feeder is the 10/3 with the extra external ground wire as seen in the pic

CowboyAndy 06-12-2008 10:27 AM

I am confused now. You say that the white 10/3 is the feeder, but it is going to a breaker? and the black sheathed is a branch circuit, but it goes to the main lugs in the panel???

Evnldr 06-12-2008 10:36 AM

2 Attachment(s)
better picture


10/3 Red Left Pole
BlackRight pole
Green and White on Neutral block
Also has a Green Ground going to the neutral block and ground spike

The Ground from the 10/3 is routed back to the main.. and a Extra Stand alone ground is also do i need 2 grounds from the main or can i remove the stand alone the green wire in the pic



So what is the limit on a 30 amp dual poll feed?

BigJimmy 06-12-2008 12:10 PM

Quote:

Originally Posted by Evnldr (Post 129887)
So what is the limit on a 30 amp dual poll feed?

Umm, 30A?

Seriously, are you talking about the minimum conductor size for the feeder?

Evnldr 06-12-2008 12:18 PM

this panel is supplied via a dual 30A (just like the one in the pic) breaker from the main panel using 10/3+ ground and another solo ground


With One 20A how many other 15's can i run SAFELY ..

I'm replacing the panel with a new one ALL lines will be on it;s own

The garage has 7 recpt total and 4 lights and one flood light the 20 will run my 110 compressor and other saws ect..

BigJimmy 06-12-2008 12:36 PM

Quote:

Originally Posted by Evnldr (Post 129921)
With One 20A how many other 15's can i run SAFELY ..

As many as the panel can accommodate! I know this sounds strange, but as far as safety is concerned, if your connected load exceeds the trip rating of the breaker in the main panel, the breaker opens. So, I think the questions that need to be answered are:

1. How big should the main breaker be back in the main panel?
2. How big should the conductors for the feeder be?

And both of these answers are a function of what the anticipated load will be.

Quote:

Originally Posted by Evnldr (Post 129921)
The garage has 7 recpt total and 4 lights and one flood light the 20 will run my 110 compressor and other saws ect..

Not too long ago, I installed a panel in my detached garage in anticipation of running a compressor and some 120V shop tools as well. I spent some time trying to anticipate this and that when I finally said, "to heck with it." Bought a 60A panel, 60A 2P breaker and ran 6awg. THWN (which I happened to already have on hand). Let me tell you, this is waaaaay overkill though. That being said, you can probably get away with 30A but if it was me, I'd increase it. On the other hand, it's hard to tell what kind of load you'll really be subjecting this to.

BTW, I put my compressor on its own 20A circuit. I'd be more concerned about your 20A breaker tripping than your main if you start adding a chop/miter saw to the same 20A circuit with the running compressor.

Evnldr 06-12-2008 01:00 PM

Only one Tool at a time or a compressor and a tool on the 20A

Small 3 HP 21 gallon

But the question i still don't have answered is..

Do I need the extra 10AWG green ground that the previous owner installed

From the main i have a

10/3 + Ground
and a 10/1 Ground

Can i remove the extra ground or not?

jbfan 06-12-2008 03:30 PM

Quote:

Originally Posted by Evnldr (Post 129928)
Only one Tool at a time or a compressor and a tool on the 20A

Small 3 HP 21 gallon

But the question i still don't have answered is..

Do I need the extra 10AWG green ground that the previous owner installed

From the main i have a

10/3 + Ground
and a 10/1 Ground

Can i remove the extra ground or not?

If you can verifiy that the ground in the feed is indeed connected at the main panel, and it is the same size as the 10/3 feeding the panel, I think you would be able to remove the extra green wire.

Evnldr 06-13-2008 12:38 PM

Ok i will probably:thumbup: leave it cannot hurt i guess


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