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# Can an appliance rated for 15A be operated safely on a 20A circuit?

# How do you install a 3-wire 220v welder outlet directly beneath a 125 amp subpanel in your garage 300 amp service to house 4 15A and 3 20A circuits currently in subpanel?

You'll want this on its own breaker. If there isn't a free breaker slot in your box, you're already in trouble - you'll have to consolidate two single breakers into a du…al. If there is a free slot or two, you're in luck. Go to Home Depot or Lowe's. Ask the helpful guy in the electrical aisle which breaker you'll need and ask him to help you select the right wire. I could explain exactly what you need, but it'll be better to get that info on-site. Get all the tips you can on installation from the guy at the store - they get constant training on this stuff. Buy what he recommends. Then go home and do it. Alternatively, you could hire a professional electrician.

# Can a 120V 15A outlet be converted to 120V 20A outlet?

yes, but make sure the wire is #12 thhn Thhn is expensive and used in lighing and settings where temperatures can be high, normal house wiring is standard… and for twenty amps # twelve (12) is needed as well as the plug which is probably a 15 amp plug. Don't forget to change that or you can burn it out by overloading it with twenty amps. The whole circuit must be consistant from the main power panel to the plug. 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.

# Can you replace a 20A GFCI with a 15A?

Yes, you can go down in current protection, but not up. With 15 Amps you just won't have as much capacity to power connected devices. If that isn't a problem you can make the …replacement, but turn off the power supplying the GFCI first.

# How many watts on a 15A circuit?

How many watts can be supplied depends on the voltage of the branch circuit. Because a normal circuit breaker should only be loaded to 80 percent of its trip rating, then 0.…80 X 15 = 12 amps. Assuming a 120 volt, 15 amp branch circuit, the maximum total wattage that can safely be supplied to all appliances connected to that circuit is (120 volts x 12 amps) = 1440 watts. Assuming a 240 volt, 15 amp branch circuit, the maximum total wattage that can safely be supplied to all appliances connected to that circuit is (240 volts x 12 amps) = 2880 watts. However, the 80% quoted is true for continuous loads only. If the appliances being switched on and off on a particular circuit never run continuously all at the same time, their individual wattages when totalled-up can, in fact exceed that 80% figure, because a non-continuously-loaded breaker may have 100% of its rating applied to it for short periods such that it does not become "warm"... 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.

# How many wall outlets can you have in a circuit using a 15A breaker?

One View:In USA: As many as you want. There's no magic number. You have 15A to play with, so you can divide that up however you wish. It all depends on what you intend to plug… in. For general usage I'd stick with the NEC Code (any point along a wall must be within 6ft of a receptacle). In my 1970's house here I've counted 9 receptacles on a single 15A breaker (yuck!). Always be sure to switch off the breakers at the main panel before you attempt to do any work on any mains power circuit. Â Another View: Yes there are some "magic numbers".The U.S. National Electrical Code Article 220.3 (B) (9) has guidelines for calculatiing general 120 volt dwelling-unit receptacle circuits as having a load of 180 volt-amps per receptacle. Because a normal circuit breaker can only be loaded to 80 percent of trip rating, then 0.80 X 15 = 12 Amps. 12 Amps X 120 volts = 1440 Volt-Amps per 15-Amp circuit. 1440 VA / 180 VA per receptacle = 8 duplex receptacles per circuit allowed. For a 20-Amp circuit, you are allowed (.8 x 20 X 120)/ 180 = up to 10 duplex receptacles per circuit. Â Another View: Both answers are technically correct. A device (receptacle, switch etc) by definition does not consume any energy so there is no load added to the circuit by installing any number of receptacles. The problem occurs when too many loads are plugged into those receptacles. The NEC section quoted above (moved to 220.14 (I) in 2008) does not apply to receptacles used for general illumination in a dwelling (which covers a majority of household receptacles). Dwellings are addressed by NEC 220.14 (J). Further, the 80% quoted is true for continuous loads only. If the appliances being switched on and off on a particular circuit never run continuously all at the same time, their individual wattages when totalled-up can, in fact exceed that 80% figure, because a non-continuously-loaded breaker may have 100% of its rating applied to it for short periods such that it does not become "warm"... A good guideline many electricians follow as a 'rule of thumb' is of 1.5 amps per receptacle. 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. Â

# Can you use 15A outlets on a 20A circuit with 12-2 wire and a 20A breaker and how many outlets would this allow?

I'm going to assume you are referring to residential construction because rules for commercial and industrial settings can be different. Also rules differ by geography (i.e. C…anada specifies a maximum of 8 outlets on a 15 amp circuit, USA code is silent on the issue but for practical purposes, more than about 10 will likely lead to poor performance. Some code also specifies max loading of a 20 amp circuit at 80% making 10 outlets the practical limit if using 20 amp outlets on that circuit. To expand on the previous answer a little, there is a large margin of safety in the construction of these components but if you think about it, you are placing a component that is rated at 15 amps into a 20 amp circuit. That outlet is potentially the weakest link in the circuit and could act like a fuse. If any of those 15 amp outlets are overloaded, it might overheat and fail before the circuit breaker. This is a recipe for a fire. You may think now that you'll remember to only plug in light loads, but these things have a habit of growing. You can plug typical small home appliances (lamp, stereo, TV, etc.) into a 20 amp outlet so the only benefit in using the 15 amp outlet is the minor cost savings at installation. If it were my building, I wouldn't risk it. If I can't talk you out of doing this and it's allowed by your applicable code, make sure you don't daisy-chain the circuit through the outlets. (In other words, don't run your 12-2 wire in one side of the outlet and out the other side.) Instead, use a pigtail (short piece of wire) to tap off your line to each individual outlet. In the United States you can run 20 amp breakers with 15 amp outlets but not in Canada. And for how many? About 10 to be on safe side as long as they are all low amp usage appliances. TVs, steros, fans, lamps. You can run 20 amp breaker with 12-2 wire as long as you make sure you use the 12-2 wire that is rated at 20 amp. Whilst this was not your exact question it is worth saying IT IS NEVER SAFE to run a 20 amp load through a 15 amp receptacle. It is only rated to handle up to 15 amps. 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.

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

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. 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. 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

# Is it advisable to use a 30A fuse in a circuit that is rated to carry only 20A?

The purpose of a fuse or breaker is to prevent electrical fires. Using a 30 in place of a 20 is not advisable even if it does not immediately cause a short. Taking a chance wi…th that is like playing with your life. Fuses are sized to protect conductors If the appliances plugged-in or connected to a circuit all used to work ok without blowing the circuit's 20 amps fuse, the first thing you must do is find out if a new fault has developed inside one of the appliances. A fault in an appliance is what needs to be fixed first and then you can repair or replace the blown 20 amp fuse with another 20 amp fuse. If the 20 amp fuse for a circuit blew because you have just plugged-in a different appliance that had not been used on that circuit before, it must be overloading the circuit and you should either: plug the appliance into a separate circuit which can take the load without blowing its fuse orre-distribute all the existing loads on the circuit until its 20 amp fuse stops blowing or install an additional circuit with the right wire size and fuse or circuit breaker to supply all the required appliance(s) safely. Changing from an existing 20 amp fuse to a 30 amp fuse because the load you are trying to supply makes the 20 amp fuse blow would never be advisable - it is called "over-fusing". Before you ever do that you must be sure that the circuit's wiring is adequately sized for that higher current level. If there is a 20 amp fuse already, it is probably because the wire is only rated to carry 20 amps. Putting-in a higher fuse size would allow the circuit to be overloaded, with possible conductor damage and fire as a result House fires often break out because someone has put in a fuse with too high a rating and let it run continuously in an overloaded state. If left like that, it can eventually get hot enough to start a fire. 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

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

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 sing…le 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.

# What are the examples of household electric appliances under the heading of 5A and 15A current rating?

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

# If the hot water heater and dryer are both run off of split 15A breakers is it safe to upgrade to 20A breakers?

You live in a mobile home, or older house? I live in a doublewide, and my dryer breakers are 30amp, and the water heater breakers are 20, both 220V lines, shared. The only sa…fe way to answer this is to have an electrician look at your setup and determine if your wiring is capable for allowing a larger (bridge) to be installed. If they are tripping on a regular basis, it may be because you installed a new water heater that requires more current than what the breaker can handle, or a new dryer. The data labels that come with these units/appliances list the energy requirements needed to operate them. But an electrician will be able to tell you for sure. Â 15 amp breakers are usually feeding #14 wire. 20 amp breakers requires at least #12 wire.

# Can you use 15A plug receptacles on a 20A circuit?

No. You need 20 amp receptacles. ( if a single receptacle on an individual brach circuit NEC 210.21 (B)(1) ) Â Yes you can use a 15 amp receptacles on a 20 amp br…eaker in the states but not in canada. ( branch circuit supplying two or more receptacle NEC 210.21(B)(3) ) Â 15 amp receptacle on a 20 amp circuit is not code, partly because 20 amp circuits use #10 ga wire, which does not fit unto a 15 amp receptacle,(can be forced but lots of work.) Also a 15 amp receptacle will not take the 18 amps continuios that a 20 amp recep. will. ( It is code, see above. 14 awg = 15 amp, 12 awg = 20 amp, 10 awg = 30 amp ) Â 20 amp wire is 12 gauge not 10 Â Yes you can use 15A outlets and swithes on 20 amp breakers they are UL listed for 20 amp even if they are stamped for 15A as long as the wire is 12ga to. ( NEC Table 210.21 (B)(3) )

Answered

# Can you use a 15A light switch on a 20A circuit?

yes, but make sure what it is switching is only rated to 15 A. Also, you can't do it the other way, unless, again, the final product that is being switched is only the 15 A Yo…u can control a 15 amp load with a 100 amp switch, but not the other way around.

Answered

# How do you upgrade from 120V 15A to 120V 20A or from 240V 20A to 240V 30A?

Answer You have to replace the wire (as you are increasing the current capacity), the outlet, and the breaker. Essentially you have to remove the old circuit an…d put in a new one. You can't reuse parts of the old circuit as you are increasing the current capacity and they would be underrated.

Answered

# Can you plug in a 120v 15a lamp into a 120v 20a receptacle?

The answer is YES Your lamp will only draw the amps that it needs from the receptacle.

Answered

In Technology

# What is the rating of a circuit breaker that will protect a small-appliance circuit?

Yes, it will be protected by a circuit breaker or fuse. The normal rating of the circuit breaker or fuse is 25% more than the maximum current expected, or the maximum curr…ent allowed for the cable size, whichever is lower.