New detached garage sub panel - Contractor Talk - Professional Construction and Remodeling Forum

Magnettica · 08-09-2008, 03:07 PM

Here's a little something I just finished for a friend of mine.

1) Pull box in the basement where I went from 6/3 NM to 1" RNC conduit with three #6 THHN/ THWN copper conductors and a #10 stranded EGC out to the garage.

2) 1" conduit for the power lines and 3/4" conduit for CATV and phone/ data (cat5e).

3) Conduit's up and into the garage.

4) Lags and shields to mount (2) PT 2x4's for panel board.

5) 1" conduit for the power lines...

6) 3/4" plywood panelboard and 125 MLO Square D QO panel.

7) 60 main breaker for emergency cutoff, 1 convenience GFCI circuit, 1 spare, and #6 copper for the ground rod.

8) Finished product. What do you think of the blue panelboard?

dkillianjr · 08-09-2008, 03:46 PM

Looks nice Magnettica!

I like the blue, it matches the basement walls in the house

You guys get those fromt the supply house premade right? I've never really seen them at the suppliers around here. Its a good idea for the suppliers though.

Dave

AWKrueger · 08-09-2008, 03:47 PM

Looks really good man! Excellent work.

Bubbles · 08-09-2008, 04:04 PM

very nice blue. Although around here it's gotta be battleship grey or black. Not sure why. I like that blue better

Bkessler · 08-09-2008, 05:05 PM

Nice, if you want to relocate to california you could work part time for me for very little money, no vacation, no insurance and where an apartment in a sh!thole place costs 1300. But I understand if you decline.

bk

MF Dagger · 08-09-2008, 07:24 PM

Is there a hold down kit on the 60?

Magnettica · 08-09-2008, 11:27 PM

Why on earth would I need a hold down kit for the 60 amp breaker?

The color of the board matching the basement paint is a pure coincidence. The truth is that the HD was sold out of the black gloss paint I normally use. I also don't know of any rule in any state that mandates the use of black or grey paint. I only paint them because it treats the wood and looks sharp.

JohnJ0906 · 08-10-2008, 08:52 AM

Quote:

Originally Posted by Magnettica

Why on earth would I need a hold down kit for the 60 amp breaker?

Try 408.36(D)

That is back fed, right?

Other than that, seal those penetrations and it will be a real nice job!

Magnettica · 08-10-2008, 10:04 AM

Quote:

Originally Posted by JohnJ0906

Try 408.36(D)

That is back fed, right?

Other than that, seal those penetrations and it will be a real nice job!

I just looked at 408.36(D) and I'm not sure how that pertains to this installation. I have a 60 amp breaker at the mb panel in the basement and an additional 60 amp mb at the panel in the garage because it's a detached garage.

Magnettica · 08-10-2008, 10:10 AM

John, is this what you meant?

(F) Back-Fed Devices. Plug-in-type overcurrent protec-
tion devices or plug-in type main lug assemblies that are
backfed and used to terminate ﬁeld-installed ungrounded
supply conductors shall be secured in place by an addi-
tional fastener that requires other than a pull to release the
device from the mounting means on the panel.

Bubbles · 08-10-2008, 02:09 PM

Here is latest service I completed. Note: to save money I put 8 meters of large building on 100 amp service, and of course, no main dissconnect. To add more ability I put lots of sub panels off 30 amp mains rated more than the main themselves. How do you like?

neolitic · 08-10-2008, 02:14 PM

Cleaned that up nicely.

thom · 08-10-2008, 03:49 PM

Maybe I'm missing something but, it doesn't look like the panel is grounded through the main. Maybe you just have different rules.

We must ground through the main, even if the panel is in an auxiliary building. We may not ground with a rod, and certainly not with an independent rod for a sub-panel. All our grounds must tie back to the main where they are all connected and only at that point can the grounds and commons be electrically connected.

mdshunk · 08-10-2008, 04:40 PM

........................

mdshunk · 08-10-2008, 04:41 PM

Nice work.

No doubt about it, however. You need a hold down kit for the 60. Backfeed any breaker, and it needs the hold down.

JohnJ0906 · 08-10-2008, 05:49 PM

Quote:

Originally Posted by Magnettica

John, is this what you meant?

(F) Back-Fed Devices. Plug-in-type overcurrent protec-
tion devices or plug-in type main lug assemblies that are
backfed and used to terminate ﬁeld-installed ungrounded
supply conductors shall be secured in place by an addi-
tional fastener that requires other than a pull to release the
device from the mounting means on the panel.

Yes. You need one.

edit to add-I see the difference in NEC articles - I quoted '08, you looked at '05.

Magnettica · 08-10-2008, 08:45 PM

Thanks guys. I have done more than a couple of detached garages over the years and never got flagged for not having the lockdown device. Learn something new everyday. Thanks again.

mdshunk · 08-10-2008, 08:52 PM

Quote:

Originally Posted by Magnettica

Thanks guys. I have done more than a couple of detached garages over the years and never got flagged for not having the lockdown device. Learn something new everyday. Thanks again.

I always think it's interesting to learn what's important to inspectors in different areas of the country. In my parts, when they check a subpanel in a detached building like that, if they check nothing else, they'll look for the hold-down hardware. Same goes for a backfed breaker from a generator transfer switch.