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How many lights and outlets can go on 15A or 20A breakers?

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2011-03-09 07:36:24
2011-03-09 07:36:24
Answer for USA, Canada and countries running a 60 Hz supply service.Lights

Lights and outlets are normally wired on separate branch circuits, which means that the lights will be protected by a separate circuit breaker to the one which protects the outlets.

Asking how many lights can go on a branch circuit is like asking "How long is a piece of string?". It is impossible to give a general answer because the total number of lights that can be installed will depend on the wattage and amperage drawn by each light and on whether or not they will all be switched on together at the same times of day or night.

If you cannot work out the total amperage of the lights you want to use at any time, compared to the safe load current of the circuit breaker on your lighting circuit, the best advice anyone should give you is to call a licensed electrician for advice.

Outlets

The number of outlets on a 15 or 20 amp circuit depends entirely on what you will plugging into those outlets. If you are plugging in an appliance that will pull 10 amps then you cannot also plug in another one taking 15 amps!

Many different combinations are possible, for example a 15 amp circuit may have 15 outlets but only 2 are being used at any one time, such as a floor lamp and a TV.

Generally speaking, most homes have 8 to 10 outlets per a 15 amp circuit. Not all outlets are used at the same time, a lamp here, a TV there, not too much. Regarding lights, you need to add up all the amps pulled by all fixtures on that circuit. The total amps pulled should not exceed 80% of the circuit breaker's maximum amperage.

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There is an allowance of 1800 watts per outlet for 15 Ampere 120 volt convenience outlets ans 2400 watts per outlet for 20 Ampere outlets.

It is required that a continuous load [operating over 4 hours] be served such that the circuit is not loaded past 80% of its capacity, which would allow a continuous 16 amp load on a 20 amp circuit. If there were 2 loads planned, the combined continuous load could not exceed 16 amps between both devices.

See NEC [NFPA 70, 2005 edition - National Electrical Code (c)] Article 210, sections 210.20, 210.21 and 210.23. The NEC does not specify a maximum number of outlets per circuit.

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As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.

Before you do any work yourself,

on electrical circuits, equipment or appliances,

always use a test meter to ensure the circuit is, in fact, de-energized.

IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB

SAFELY AND COMPETENTLY

REFER THIS WORK TO QUALIFIED PROFESSIONALS

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Building codes will vary. In the US, the National Electrical Code (NFPA 70) is the basis for most of those. The answer will vary depending on what the structure is. For a single family home, there is no specific number of outlets per breaker. For commercial work, there is a limit of 10 outlets per 15 amp, and 13 outlets per 20 amp. The actual current draw MUST be taken into account as a practical matter. YOUR local building codes may differ from the NEC.

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Depends on what you plan to power with it. You can hook millions of outlets to one 15A breaker and it will work fine as long as you don't draw more than 15A off the circuit. You need to calculate your expected load and use that to determine how many circuits you need.

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To meet the requirements of the electrical code you have to know the total wattage of the lights that you are going to connect to the 15 amp circuit.

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15A x 120V = 1800 VA NEC allows 180 VA per receptacle 1800/180 = 10 receptacles

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5A: lights, radios, televisions, tuners/amps, 15A: convector heaters, irons, toasters, microwaves.

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Yes, you just have to be sure you are grabbing power from each of the two legs.

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Tthe dashbord lights and tail lights are on the same circuit. On my 2000 Xterrra the 15a fuse is located in the fuse panel under the hood labeled 'TAIL'.

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Your tail lights are on a separate circuit. Check the 15A fuse under the hood in the power distribution center, next to the battery.

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It is already in its simplest form, so it is: 15a + 25

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Zero. 60A is far too high to power outlets directly. A fire will start far before the breaker blows. What you can do is use the 60A line to power a subpanel, and break the 60A line into 15A branch circuits to feed the outlets. As for the number of outlets you can install on that, you need to sit down and calculate your power needs. What do you plan to power with this? Where do you need outlets? What are your future needs? If you can answer these questions you know what you need. Remember the rule of thumb: your expected load should be no more than 80% of the breaker's capacity. I like the analogy of faucets on a pipe. You can put as many faucets as you want on it, but how many you can use simultaneously is another story. There is only so much water coming into the pipe for so many faucets. Same thing with outlets. You can put as many as you want on a circuit, how many you can use simultaneously safely is another story.

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(15a)2 / 3a = 225a2/3a = 75a

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Yes it is wired with copper 2 wire is also known as 14/2 wire is use for switches,outlets,lights. and a 15a outlet should only be on a 15a breaker the main power feed to your meter to your panel is aluminum and can take more of a load than copper. In the US, 15 amp receptacles can be installed on 20 amp circuits if there is more than one receptacle on that circuit. Copper wire can carry a larger load than aluminum wire of the same size.

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If you mean: 15a = 6a - 90 then the variable a works out as -10. If you mean 15a + 6a - 90, then it equals 21a - 90.

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