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#78953 11/13/01 02:07 PM
Joined: Oct 2000
Posts: 2,749

How many duplex receptacles can be installed on one 15 or 20 ampere, 125 volt rated, single phase branch circuit in a dwelling unit?

Please verify with the reference in the 1999 NEC.

Joe Tedesco, NEC Consultant
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Joined: Oct 2000
Posts: 5,392
Joe, dwelling or non-dwelling, big difference....

Joined: Mar 2001
Posts: 345
The maxim of the law is that silence is consent. Since the code limit does not apply to dwelling units the number is unlimited. The asterisk note below the table in branch circuit and feeder calculations makes this clear.

*All general-use receptacle outlets of 20-ampere or less rating in one-family, two-family, and multifamily dwellings and in guest rooms of hotels and motels [except those connected to the receptacle circuits specified in Sections 220-4(b) and (c)] shall be considered as outlets for general illumination, and no additional load calculations shall be required for such outlets.

Tom Horne

"This alternating current stuff is just a fad. It is much too dangerous for general use" Thomas Alva Edison
Joined: Nov 2000
Posts: 2,148
I know that you are well aware that there is no limit on the number of receptacles that can be connected to a dwelling unit branch circuit, so what's with this question?

Joined: Oct 2000
Posts: 5,392
220.3B(10) has no 02' change

Joined: Oct 2000
Posts: 2,749
Don and others:

Yes, I am well aware of the correct answer and gave the same references, but wanted to have one of my students here in Dayton see the replies I expected to get from this ECN bulletin board.

Now they will have to join if they want to argue the point.

If I ask a question like this one, it is for that simple reason ---- to give another opinion, or other answers to the question(s) asked of me.

Thanks for your replies so far, I am finished now for today and hope that others will add their comments here so I can start in the morning signing on with this thread.

Joe Tedesco, NEC Consultant
Joined: Oct 2000
Posts: 5,392
ok, i have a 5000' dwelling and have placed ALL the general use receptacles on a single circuit.

students.....please argue the example.

Joined: Oct 2000
Posts: 2,723
Likes: 1
Broom Pusher and
Ah, yes - good approach Steve!

Here's a little more added to your example:

I have an 8,500 Sq. Ft. House with basement, 2 floors, large Kitchen, 3 car garages, etc. [much overkill!].
I plan to have the Clampetts live with my family of 9 people in said house once it's completed.
Ellie May plans to bring home 30 dogs and 25 Gorrillas from the Zoo, all need plenty of light and "attention" [AKA Vacuuming up 'zee `Poo `Poo].
Jethro will be turning the truck into a dragster, or building rocket ships to go to the moon.
Granny has 4 electric powered stills to cook her "Corn Squeez'enz".
Jed has converted from hand tools to power tools.

I have 2 kitchen circuits, 1 bathroom circuit, 1 laundry circuit, 1 lighting circuit per floor, 1 bedroom AFCI circuit, 1 receptacle circuit for all other receptacles, 1 FAU circuit.

This could easilly work for certain people [like ones who fear electrical power [Linked Image]], but what exactly makes it suck so bad to wire my house to these NEC minimums?

Without doing any math, it looks like a 125 amp service would satisfy minimums here [non-electric cooking eq.]

Students, please point out the pros or cons of this setup [other than the eccentric room mates].

Scott SET

Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!
Joined: Aug 2001
Posts: 7,520

5000 sq. ft. dwelling with all general recepts. on one branch circuit.

That would violate the NEC wouldn't it? Max. rating 20A for a general circuit or 2400W. General illuminaion load to be calculated at min. of 3W per sq. ft.


Joined: Oct 2000
Posts: 4,106
Likes: 3

Calculations are for for services, etc. Nothing specific for Branch circuits though, or limitations on # of devices per. Doesn't seem right, does it? [Linked Image]


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