Calculated Receptacle/Lighting Oulet Loads?

[ritelec]

ok.....maybe I got it.............

Instead of taking the actual building and laying out what's needed for that tangible structure...wall space, possible loads "if unknown" or known....

We take an intangible mathematically square foot of the structure (or rooms)., apply a va to that square feet.............then kinda work back words and make the tangible work into the intangible.


example.
no appliance, or other required......
just general.........
2000 sq feet a 3 va = 6000 va

6000 va divided by 120v = 50a

50a divided by 15a = 3.33

So................ install, tangible lighting and receptacle outlets.........however many are required because of wall space or layout (or as many as you want) on 3.33 (or 4) circuits...

????

yes/no ?


(gonna come back and revise........seeing where the 180 va sits in this cart before the horse layout.............I'll be back)

 

[ritelec]

all right........the 180va ...220-14(J) includes it in the 220-12 3 va.

So was that it.............mathematically come up with a number ....... and make it work............



Annex D.................Jumper

 

[kwired]

I'm doing some knob and tube replacement.....
So all though a person probably wouldn't, (except for a few dining room recepts and ac's), all the recpts and single light outlets (not dwn/can/hh) for fixture or fan/light are bed, hall, etc....

You're saying I could put "all" these 26 recepts and 12 light outlets on one circ?

Thats great news.........gonna be saving some $$$ on afci's....

Unfortunately AFCI has driven installers to put more outlets on a circuit than they used to, but at same time (though nothing wrong with the practice) many were putting in more circuits than maybe necessary.

One other thing to remember is some outlets are required to be on separate circuits but the load is already included in the general lighting such as bathroom receptacles and these are often the outlets you do not want much other load on the same circuit with anyway.

Still getting my head around this...........except for the required laundry, kitchen etc...

You're saying if I'm wiring a house the size of Michigan Stadium I would only need one 15 amp (convenience) receptacle circuit???

Kind of. Maybe put all the lighting outlets on however many circuits are necessary to handle them and then run one 15 amp circuit for all the general purpose receptacles. May not be wise but should be NEC compliant. When the AFCI trips, on other than overload, you may have one heck of a job just narrowing down where the problem is thoughhmy: