Question about Electrical Supplies
Finding out if you need to increase amps if you add more outlets to your home. And typically how much amps to increase by, and after how many outlets would require to increase amps.
Yes maybe, depending on what you are doing.
1) Electric Code generally says Maximum 12 boxes per electric circuit controlled by 1 circuit breaker. If you have more boxes, then your house can fail inspection IF inspector finds problem. But it is a minor problem if wire size, breaker size, and amp loads are safely matched.
2) Reason for the code: so there is not power loss to last box when many things are drawing power from same circuit, which can cause overheating of circuit and trip breaker, and cause heat damage to some electronic devices and motors.
Which is why you are asking the question.
3) In practical terms, if you are adding outlets to run another light bulb, then you will probably not notice any problem.
However if you are adding plugs so you can run shop tools, or blower motor, or compressor etc, then that can be a problem.
For example if wire is too long, there will be power loss to motor which will cause motor overheating and shorten life of equipment.
Calculate total amps and watts expected on that circuit.
Add up watts of everything running at same time.
Volts x amps = watts
120 volt microwave uses 1500 watts, how many amps?
Amps = watts divided by volts, so 1500 watts divided by 120 volts = 12.5 amps.
Compare your total expected amp usage to charts on following link.
Make sure you have correct wire and circuit breaker for expected amps. Oversizing wire and breaker are good idea.
Posted on Oct 27, 2012
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Posted on Jan 02, 2017
you may have agfi outlet in the circuit. the outlet has 2 push buttons in the middle. it maybe an outside outlet that is tripped some contractors hook up the circiut like that
Posted on Mar 09, 2009
I would say something a little different than SmithBrother. You said you are putting on an addition and you asked how many outlets can you put on a 20 amp breaker. Because of the date on your comment, it is probably a little late to be replying but whaat the heck ... here goes.
I think there is a rule of thumb that you can put about 12 "holes" in a 15 or 20 amp circuit. A "hole" is a hole in the wall where a box would be put for a outlet or a light or a switch. I presume you know to use #12 wire on a 20 amp circuit and while you may use #14 on a 15 amp circuit, I prefer to shy away from #14 wire even though I MAY protect a given circuit with a 15 amp breaker. You can over protect but not under protect. 30 amp is #10 and so forth.
There are lots of other considerations ... too many to do justice in this short comment. However, I will hit a few hi lites. As SmithBrother says, a micro wave should have its own circuit as should a AC or a frig - I think that may go without sayng. I think you are speaking more general use. I believe the electric code says every wall must have a plug in it and you can go no more than 6 feet to get to a plug. So, if you have a 12 foot wall, one outlet in the middle will meet the requirement. There is nothting preventing you from puttine two outlets in that same wall. From my perspective, I want to have lots of outlets and I want them to be convenient for me to use. (There are more than 200 outlets in my home) Another thing, you cant put a outlete over a electric baseboard heater. You can put one at each end of such a heater but not where a lamp cord would lay in top of the hot heater surface.
Regarding the 12 hole rule ... if you have two switches that control the same light, you only count those two switches as one hole even though, obviously, there are two holes in the wall for the two switches. Count a second hole for the light. Conversely, if there is a light and a fan, you should count that one hole in the ceiling as two.
Posted on Oct 07, 2009
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