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210.23(A)(2) and 3 Car Garage #97238
02/05/06 09:46 AM
02/05/06 09:46 AM
Redsy  Offline OP
Joined: Mar 2001
Posts: 2,056
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)


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Re: 210.23(A)(2) and 3 Car Garage #97239
02/05/06 11:59 AM
02/05/06 11:59 AM
George Little  Offline
Joined: Jan 2004
Posts: 1,489
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
Re: 210.23(A)(2) and 3 Car Garage #97240
02/05/06 12:10 PM
02/05/06 12:10 PM
earlydean  Offline
Joined: Dec 2003
Posts: 751
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.

Re: 210.23(A)(2) and 3 Car Garage #97241
02/06/06 12:43 PM
02/06/06 12:43 PM
dlhoule  Offline
Joined: Apr 2005
Posts: 73
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.

Re: 210.23(A)(2) and 3 Car Garage #97242
02/06/06 09:48 PM
02/06/06 09:48 PM
Redsy  Offline OP
Joined: Mar 2001
Posts: 2,056
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.

Re: 210.23(A)(2) and 3 Car Garage #97243
02/06/06 10:24 PM
02/06/06 10:24 PM
Dnkldorf  Offline
Joined: Dec 2004
Posts: 1,064
nowhere usa
ground to the left or ground to the right on the opener receps?


Re: 210.23(A)(2) and 3 Car Garage #97244
02/07/06 12:03 AM
02/07/06 12:03 AM
Trick440  Offline
Joined: Aug 2005
Posts: 248
Waterford, MI, USA
1 dedicated circuit for the 3 openers sounds perfect.

Shake n Bake


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