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(Re)Wiring a vintage garage

David Conwill

Active member
Joined
Dec 31, 2007
Messages
34
Location
Bay City, MI
Okay, here’s the story: About a month ago I bought my first house. It came with a good size (about 14' wide x 20' deep) circa 1920 garage (the house was one of the nicer ones in town at the time it was built, and the folks evidently drove some pretty large cars; Packards or Locomobiles or something). I intend to keep the garage original on the exterior, but I’d like to upgrade the inside to help as I rehabilitate the house, and eventually to allow me to tinker on old cars.

Currently there’s a two-fuse electrical service in the garage coming in from a single circuit in the house. There’s a single outlet on the West wall and two bare bulbs suspended from the ceiling - neither of the lights work for reasons I’ve yet to determine. The outlet is controlled by an old rotary switch near the west vehicle door, and all of the wiring is knob and tube.

I’m planning to start over on the wiring, but I don’t want to do anything with the house electrical service at the moment. Ultimately I’d like to have two outlets on each wall for a total of six, two functional incandescent lamps in the current position, and probably two or three fluorescent fixtures along the back wall to illuminate a workbench area. (Way down the line I’d love to add 220 to possibly run a welder; sufficient service to run an air compressor; etc., but a few more outlets and some lighting will suffice for now.)

I’m confident in my ability to wire, but I’ve never planned a wiring project from scratch, so I’d appreciate a little help planning within the current constraints but with an eye to the future.

I do understand a few of the basics, of course, like all the horizontal runs have to be in the attic of the garage so nobody is tempted to hang things from them, etc.

-Dave
 
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PAToyota

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Jan 20, 2006
Messages
4,366
Location
South Central Pennsylvania, USA
The first question is what service is available in the house. I'd run a sub-panel in the shop fed from the panel in the house. Depending on needs, you could run a 60amp 220V panel in the shop fed from a 60amp 220V breaker in the house. But that is providing that the house panel has enough extra capacity to do so. I have a number of neighbors with 60amp or 100amp total service to their older houses so they'd need to upgrade the main service before they considered adding service to a garage.
 
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David Conwill

Active member
Joined
Dec 31, 2007
Messages
34
Location
Bay City, MI
Currently 100A service in the house, I'm planning to go 200A sometime in the future, once I've pulled out all the remaining knob and tube.

-Dave
 

trainer

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Nov 28, 2005
Messages
2,019
Location
Northern Ontario, Canada
You could probably put a 60amp panel and feed it from a 60 amp breaker in your main panel, depending on what your local code allows.

Since you just want a few outlets and lights for now, you probably won't be overloading your main panel, but you wont have to redo things again once you get your main service upgraded.

I recently renovated a building thats similar in size and age. It's got a 30 amp panel, (two single and one 220 breakers) three flourescent fixtures, 8 outlets, and a 220v, 2,000 watt electric heater.
 

38 Special

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Joined
Feb 16, 2009
Messages
105
Location
Irondale, Alabama
You could probably put a 60amp panel and feed it from a 60 amp breaker in your main panel, depending on what your local code allows.

Since you just want a few outlets and lights for now, you probably won't be overloading your main panel, but you wont have to redo things again once you get your main service upgraded.

I am NOT an electrician, don't even play one on TV and did not stay in a Holiday Inn Express last night.

But, if you do the above, why not put a 20 amp breaker (or whatever it is currently) at the house, into a larger box in the garage. Then, when the house service AND the line to the garage is upgraded, just change out the breaker size.
 

nadogail

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Jan 23, 2009
Messages
32,068
Location
Coronado, CA
I vote with PAToyota & trainer. Do your garage right the first time, and it will be done.

I am a fan of Knob & Tube wiring and if it were mine, I would rather keep it than trash it.
 
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PAToyota

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Jan 20, 2006
Messages
4,366
Location
South Central Pennsylvania, USA
Knob and tube isn't necessarily bad - IF it isn't compromised and IF it isn't overloaded.

I'd recommend upgrading the service to the house and running a decent sub-panel to the garage rather than doing it twice.
 

Mattlt

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Joined
Nov 30, 2005
Messages
1,382
Location
MN
I think it would be cool to keep the knob and tube, even if it wasn't being used.

Maybe run some new circuits for use and keep the K&T for show?
 

trainer

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Joined
Nov 28, 2005
Messages
2,019
Location
Northern Ontario, Canada
If you want to keep the k&t as a conversation piece, perhaps it could be converted to low voltage to power a few lights

Even though there's nothing wrong with unmolested K&T if its in good condition, your insurance company would probably prefer to see it go.
 
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David Conwill

Active member
Joined
Dec 31, 2007
Messages
34
Location
Bay City, MI
I'm planning to keep all the K&T I remove and eventually do something with it like this:

Edison_Chantelier.jpg


-Dave
 
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