City-Data Forum 14 Gauge Wiring and 15 amp circuits?
 User Name Remember Me Password [Register]
Please register to participate in our discussions with 2 million other members - it's free and quick! Some forums can only be seen by registered members. After you create your account, you'll be able to customize options and access all our 15,000 new posts/day with fewer ads.

03-24-2011, 09:33 AM
 1 posts, read 20,258 times Reputation: 11

i`m running 14-2 wire for 53 feet and in floor heat cable at 1146w and 9.6aA . I want to know if it meets code . (ont. severn township)

03-24-2011, 01:05 PM
 Location: Johns Creek, GA 11,876 posts, read 45,659,960 times Reputation: 12996
Quote:
 Originally Posted by raysch i`m running 14-2 wire for 53 feet and in floor heat cable at 1146w and 9.6aA . I want to know if it meets code . (ont. severn township)

If it's a dedicated 15amp circuit- ok. Voltage loss is minimal.

12 ga: R = 1.932 Ω / 1000 ft, Loss @ 5 Amp = 0.0097 volts/ft.

14 ga: R = 3.072 Ω / 1000 ft, Loss @ 5 Amp = 0.0154 volts/ft, or 1.5 volts in 100ft

03-24-2011, 01:27 PM
 Location: Grosse Ile Michigan 24,717 posts, read 59,563,864 times Reputation: 26822
Most new houses have 14 ga wire and 15 amp circuits. You will have a few specialty circuits with 12 ga wire and 20 amp breakers and outlets. These are usually dedicated circuits, meaning they are designed to power a single item like a fridge, dishwahser, wahing machine. Big items like HVAC, electric dryers, electric stoves can be on even higher rated circuits. Many of them are 240 v. with 50 amp breakers.

When a compressor starts up it initially draws a huge surge of power. This will trip your GFCI. It does not mean that the GFCI is defective, your fridge should not be on a GFCI. For this reason, while code requries all kitchen outlets to be on GFCI, the fridge outlet is NOT to be on a GFCI. (I think it also has to be a dedicated circuit. I cannot remember, but I have awlays put the fridge on a dedicated 20 amp circuit.)

Keep in mind that 14 ga wire and 15 amp breakers also should have 15 amp outlets. this helps avoid someone plugging in a device that draws more than 15 amps and overloading the circuit. More importantly, a 20 amp circuit with 12 ga wire must have 20 amp outlets. You can identify a 20 amp outlet because one of the slots for the plug prongs has a cross cut in it. If it does not have that, it is a 15 amp outlet, it is or should be a 15 amp circuit, and you should not plug in devices that draw high amperages.

Compressors, large motors and things that heat up tend to be high amperage devices. Very few other things draw more than 15 amps. However plugging multiple items into a single circuit can exceed 20 amps. It is generally a good idea to know which outelts and fixtures are ont he same circuit, so you can be at least generally aware of the possibility of overloading.

When I wired our current house, I ut all of the outelts on 20 amp 12 ga circuits, except one or tow outlets that I knew would never get much load. All of the light fixtures are on 14 ga wire and 15 amp curcuits, buy that is unusual. Our contractor said that I was just wasting money to use 12 ga wire. However I am stubborn and I am also aware of the propernsity in our family to use power strips and plug tons of things into a single outlet. I put in lots and lots of extra circuits and outlets to avoid this, but we still do it in places.

03-24-2011, 03:48 PM
 Location: sowf jawja 1,940 posts, read 7,965,006 times Reputation: 1037
#14 is legal by the NEC everywhere in a home except for the following locations;

small-appliance branch circuits; includes kitchen counter receps (excludes refrigerator, dishwasher, microwave, etc. . ). You must have at least two 20A circuits feeding a kitchen

must be at least one 20A circuit feeding a recep in each bathroom

must be at least one 20A circuit in the laundry room

dining or nook adjacent to kitchen is considering SABC, and must be a 20A circuit

anything required by manufacturer's instructions to be on a 20A circuit

may have missed something but i think that covers it.

03-25-2011, 07:23 AM
 Location: Johns Creek, GA 11,876 posts, read 45,659,960 times Reputation: 12996
Quote:
 Originally Posted by southgeorgia ...may have missed something but i think that covers it.
Yeah, the thread is 3+yrs old.
It was revived by "raysch" yesterday. The question was about a circuit for in-floor heating.
 Please register to post and access all features of our very popular forum. It is free and quick. Over \$68,000 in prizes has already been given out to active posters on our forum. Additional giveaways are planned. Detailed information about all U.S. cities, counties, and zip codes on our site: City-data.com.