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Augy123

02:06PM | 09/21/05
Member Since: 09/20/05
7 lifetime posts
Bvelectrical
I have a 200 amp main electrical panel in my garage (on an exterior wall). I want to install a subpanel in the basement to feed several circuits I will need as I finish off the basement into several living areas.

It looks like the most viable route to running a supply feeder is out the exterior wall behind the main circuit panel, down the existing conduit, then buried along the foundation and finally re-entering the house near the subpanel location in the basement.

Is this a logical idea? What type and size of wire would I need for a roughly 50' run buried below grade? Any suggestions or ideas would be appreciated.


househelper

04:39PM | 09/21/05
Member Since: 03/31/05
265 lifetime posts
I'd run conduit the whole way and use 4 individual conductors (THHN/THWN). Conduit size and wire size depends on what size circuit you plan to run. For example, for a 100A circuit, use three #3 and one #8 (all copper) in a 1.5in PVC conduit.

Augy123

10:39AM | 09/22/05
Member Since: 09/20/05
7 lifetime posts
I was thinking more like a 30- or 40-amp panel. I only need 4 or 5 circuits in the basement.

It's possible I might be able to run a feeder cable up the wall, through the garage attic, then down the interior wall to the basement. Would this be a better idea than going the exterior route?

Also, for a 40-amp ciruit would the proper wire size be 8? If I went the interior route, what type of cable should I use?

Thanks

Augy123

11:34AM | 09/22/05
Member Since: 09/20/05
7 lifetime posts
In thinking through this, I'm wondering now if a 40-amp panel would be sufficient. Would it be better to just install a 100-amp subpanel even if I don't expect to ever install more than 4 or 5 circuits? All I need to supply power to are: bathroom; bedroom; storage room; rec room.

househelper

11:45AM | 09/22/05
Member Since: 03/31/05
265 lifetime posts
I won't advise installing a subpanel on any circuit less than 60A. Anything between 60 and 100 would work, although I think 60 would be sufficient in your case.

Keeping the wires on the interior would be less expensive and you could use 6-3w/g unless the run is very long, then you would have to bump up to 4ga.

Augy123

04:17PM | 09/26/05
Member Since: 09/20/05
7 lifetime posts
I've had a friend suggest another option and was wondering if it is a safe and acceptable solution.

Could I run conduit along the interior wall of the garage to a point where I could enter the wall and fish the wire into the basement? Basically, I'd have conduit along two walls in the garage (one exterior wall where the main panel is and a second wall that is partially exterior and partially interior.

What wire would I use in this configuration for a 60 Amp subpanel or a 100 Amp subpanel. The length of the feeder wire would be about 40'.

The reason I question this solution is that I'm not sure what wire would work in both conduit and non-conduit (through walls) applications.

Thanks for the help!

Billhart

07:08PM | 09/26/05
Member Since: 04/25/05
1915 lifetime posts
You can pull NM or SE cable through conduit. But the conduit has to be sized for it according the conduit fill calculations. And it would probably be hard to pull.

I would run individual wires to the end of the conduit and then install a juction box and splice it to the cable.


Augy123

05:19AM | 09/27/05
Member Since: 09/20/05
7 lifetime posts
Thanks for the advice, that sounds like a good solution to me. I'll have to re-examine where I can enter the basement and I might be able to run conduit up to the garage from below. That would leave only the interior of the wall from the main panel to the first junction box without conduit (where I would use cable).

Augy123

07:13AM | 09/28/05
Member Since: 09/20/05
7 lifetime posts
I have a route in mind now and need to know a few specifics. The run will be about 50' (through the interior of the garage).

I plan to use a 100A panel but feed it with a 60A feeder breaker. Is this a good solution and is a "feeder breaker" a special type of breaker?

Can I use a 100A main panel as a subpanel?

What type/size wire should I use for feeder wire?

What type/size conduit should I use?

Thanks for all the help, I really appreciate it.

househelper

10:01AM | 09/28/05
Member Since: 03/31/05
265 lifetime posts
A feeder breaker is just a standard breaker that is used to feed a subpanel.

Yes

6ga THHN/THWN if conduit all the way. Two blacks and a white, or red, black, white. Add 8ga green for the ground.

Go ahead and use 1.25 or 1.5in PVC in case you want to up size the wire later.
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