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#97238 - 02/05/06 05:46 AM 210.23(A)(2) and 3 Car Garage
Redsy Offline

Registered: 03/28/01
Posts: 2138
Loc: Bucks County PA
I feel I need to run 2 circuits for the GDOs (3 of them) if a receptacle, or lighting outlet is also supplied.
(My own 1/2 HP units draw 5 amps each)


2014 / 2011 NEC & Related Books and Study Guides
#97239 - 02/05/06 07:59 AM Re: 210.23(A)(2) and 3 Car Garage
George Little Offline

Registered: 01/18/04
Posts: 1492
Loc: Michigan USA
From a real world prospective, you are not likely to have a problem. It certianly is not a fire or shock hazard but I'm sure if you operated all 3 GDO's at the same time you might trip the breaker. Depending on what else you have on the circuit- air compressor, freezer or other larger appliances, you might trip the breaker when you use only one GDO.

So this guy has a 4 car garage- he/she can afford the additional circuit(s).
George Little

#97240 - 02/05/06 08:10 AM Re: 210.23(A)(2) and 3 Car Garage
earlydean Offline

Registered: 12/22/03
Posts: 749
Loc: Griswold, CT, USA
I have a three car garage, and I ran a single circuit to all three openers. I fully expected to have to run a second circuit for the last of the three openers. But, the circuit held when I opened or closed all three at the same time. (added one opener at a time over several years)
I did run a separate circuit for the lights and receptacles.

Are you trying to avoid installing a panel in the garage? The NEC makes it clear that if you run a multiwire branch circuit (sharing the same neutral with two hots) to a detached garage, that it constitutes a single circuit, and a panel (and the ground rods) are not required.

#97241 - 02/06/06 08:43 AM Re: 210.23(A)(2) and 3 Car Garage
dlhoule Offline

Registered: 04/28/05
Posts: 71
Loc: Saline, MI 48197
I also have 3 openers on same circuit. The only time I have tripped a breaker was when I had an elect heater plugged into same circuit I was using table saw and someone else was using skill saw at same time.

It also had no affect on doors because they are on circuit by themselves.

#97242 - 02/06/06 05:48 PM Re: 210.23(A)(2) and 3 Car Garage
Redsy Offline

Registered: 03/28/01
Posts: 2138
Loc: Bucks County PA
Thanks, guys.

It is an attached garage, and my main concern was NEC compliance regarding the aforementioned article.
As far as performance, it is probably a crap shoot. If someone operates all 3, the CB might not handle the starting currents.


I ran a 2nd circuit.

#97243 - 02/06/06 06:24 PM Re: 210.23(A)(2) and 3 Car Garage
Dnkldorf Offline

Registered: 12/12/04
Posts: 1091
Loc: nowhere usa
ground to the left or ground to the right on the opener receps?


#97244 - 02/06/06 08:03 PM Re: 210.23(A)(2) and 3 Car Garage
Trick440 Offline

Registered: 08/15/05
Posts: 248
Loc: Waterford, MI, USA
1 dedicated circuit for the 3 openers sounds perfect.
Shake n Bake


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