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JohnstownFlood 03-10-2011 04:45 PM

Circuitry plan for small house
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We are in the preliminary stage of planning the wiring for a new house, 1380 sf, story and a half, sitting over a crawl space. The attached pic lays it out, at least as far as we've gotten.

Please comment and advise what we should change. Thanks.

SD515 03-10-2011 07:55 PM

Uhh...if this is a serious question, I would advise contacting an electrician in your area and have them review your situation.
2 pole and 4 pole breakers? Where are the single pole breakers?

oleguy74 03-10-2011 08:05 PM

first the arcfaults are single pole.why a 30a 4 pole for dryer?smoke det's have to be on same show 2 different ckts.the 20 amp 2p0le are tandems correct?

rjniles 03-10-2011 08:06 PM

Looks like you are calling single pole breakers 2 pole and double pole breakers 4 pole, not sure where you found that convention?

#30 amp, 240 volt well pump? You must be planning on a lot or water to use a 9-10 HP pump

30 amp 240 volt range, cooking very small meals?

You should have a real electrician develop an electrical plan.

SD515 03-10-2011 08:09 PM

Caught that too. Upstairs might get chilly too.

JohnstownFlood 03-10-2011 09:12 PM

Well, thank you all. It was good of you to look at the detail, and comment.

Sorry about doubling those breaker descriptions. All are changed to be either single-pole or two-pole.

Smoke alarms taken off the various AFCI-protected circuits and placed all on a the non-AFCI circuit feeding the entry porch lights and receps. Those outdoor receps are in WP boxes and are GFCI-type.

Well now has a 15A breaker, and range has 50A.

What's that about the chilly upstairs? I did not offer room sizes, heat loss analysis, etc.

An electrical contractor will be hired, but we want to get out ahead on this job. Get to know some best-practice stuff, and how code affects things. the last sparky hired made a mess of part of the job, misinterpreted code, and organized circuits inefficiently.

And hey, isn't this forum called DIY?

oleguy74 03-10-2011 09:27 PM

smoke det's should be on a afci ckt.i usually put them on master bed light ckt.

Jim Port 03-10-2011 09:42 PM

Lighting circuit are not typically loaded very heavily. A 15 amp breaker with #14 wire is much easier to work with and should be fine for most lighting circuits.

JohnstownFlood 03-10-2011 10:12 PM

Olguy, you said, "smoke det's should be on a afci ckt." Are you able to cite the code reference? What is the logic here, with a hard-wired device like a smoke?

Everything I am finding says receps are to be afci-protected, but there is no mention of smoke alarms. It's all about those cords, right?

oleguy74 03-10-2011 11:49 PM

it has been part of code sience 99 or 2002.but it don't matter now as all general pourpse lighting and outlet ckts are req to be afci.what cords?

brric 03-11-2011 06:17 AM

All bedrooom outlets(points of use) must be protected by arc fault circuitry. Therefore smoke detectors that are in bedrooms must be on such circuits.

DangerMouse 03-11-2011 06:54 AM


Originally Posted by brric (Post 607160)
All bedroom outlets(points of use) must be protected by arc fault circuitry. Therefore smoke detectors that are in bedrooms must be on such circuits.

Huh??? My smokes are all on their own 15a circuit and are NOT part of any of the bedroom circuits they're in....


Jim Port 03-11-2011 08:05 AM

Under the older code cycle all receptacles that were in the bedroom required AFCI protection. The rule then changed to all outlets in the bedroom required the AFCI. This is why smoke alarms are now required to be AFCI protected. An outlet is not just a receptacle.

The NEC definition of outlet: A point on the wiring system at which current is taken to supply utilization equipment.

The requirement for AFCI protection has expanded greatly and now is required in most places in the house.

rjniles 03-11-2011 08:05 AM


The reason to have the smokes on a lighting circuit is so you will be aware if the circuit breaker is off or tripped.

Scenario: Your teenage son burns toast in the kitchen and sets off the smoke alarm. To silence it, he turns off the breaker. He forgets to restore the breaker and you are now unprotected. If the smokes are on a lighting circuit you will become aware of the problem when it gets dark.

DangerMouse 03-11-2011 08:23 AM


Originally Posted by rjniles (Post 607176)
To silence it, he turns off the breaker.

That does not work if there are good batteries in the smoke detectors....


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