# how many amps can a 50 amp breaker handle

Depending on what you are trying to calculate you would have to measure exact voltage under load to determine your utility supply. Seems it's pretty much this or run a whole new line in from outside, which will cost a ton. You are correct in that 50A per leg is what to expect. The extra prong carries the second 120 volt connection to get 240 volts total. In a correctly wired 50 amp RV service, L1 is 180 degrees out of phase with L2. We know that 40 amps is the max for 8 awg AND we know there are always exceptions to these rules. Well, one would think a 50 amp breaker would be 50 amps but alas, not quite true, I think it's about 45 amps that it can carry sustained, possibly less. 5 Ways Smartphones Can Improve Your RV Trips. Join the #1 RV Forum Today - It's Totally Free! I complained to the campground owner. The breaker protects the wiring not the boiler. That is why, when you look at a 50 amp plug, it has four prongs compared to three on a 30 amp plug. 30 ampere breaker defines the limit at 30 amperes strictly so you should not be using more than 24 to 25 amperes when using a 30 Amp breaker. On inspection, a 50 amp breaker was noted to have 8 awg copper wire. Are the neutrals sized for 100 amps, or 50? The electric dryer uses a 30 amp breaker. That means 40 amps per line on a two pole 50 amp circut. Best of all it's totally FREE! Thanks! You are already overbreakered and you need to fix that. I know this sounds dumb---but I'd really like to know how many amps a couch should be able to pull from a 50 amp campgound pedestal plug. It has two 5600 watt heating elements in it, which is 11,200 watts. Correct me if I'm wrong. And you can’t simply replace a 15-amp breaker with a 20-amp breaker; that’s the modern-day equivalent of putting a penny in the fuse box. This is the maximum amperage that the circuit can take before the circuit breaker trips. Since I have never seen a 120v 100 amp breaker, I assume you are talking about a 240v, so: 240 volts x 100 amps = 24,000 watts Depending on what you are trying to calculate you would have to measure exact voltage under load to determine your utility supply. You will have 60 amps of 240 volt power available. What size amp circuit breaker would protect a 12kW boiler? 8 AWG may carry a maximum of 70 Amps in free air, or 50 Amps as part of a 3 conductor cable. Timothy Thiele is an electrician who advises residential DIYers on how to make home installation projects safe and easy. The main breaker is marked with the value of protection (like 100 amps) on the breaker handle. However, circuits should not be loaded to greater than 80 percent of their maximum capacity for long periods, which makes 1,920 watts the safe maximum for a 20-amp circuit. iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? He claimed that his breakers were fine and said the most I can pull is 25 amps per leg. Can I use a 50 amp breaker for a 40 Amp hot tub? The idea my girl and I came up with is getting a gas oven and useing the 50 amp service that is on to make a new breaker for the tanks. At 220 volts, this is 50 amps! How many 50 amp RV sites can a 200 amp meter service handle? Do You Need A Portable Air Compressor For Your RV? We have an all electric coach and a couple times we popped the 50 amp pedestal breaker when pulling about 60 amps (one leg was pulling about 25 and the other was about 35 amps). Without a fuse to disrupt the flow of power when too many amps are pushed through a circuit, wires overheat, wire insulation melts and fires break out. Only a 10-gauge copper wire with either a 75 ℃ or 167 ℉ or 90 ℃ or 194 ℉ ambient temperature rating, as well as a 10-gauge aluminum wire with an ambient temperature rating of 90 ℃ or 194 ℉ can handle 35 Amps. A 1500-watt heater on a 120-volt circuit thus needs a breaker of 15.6 amps. If the appliance draws 30 amps, you need a different type of … My guess would be 50. The breaker that i took out was a 60 amp, bottom of the panel, so only 1 breaker next to it with a small, non constant load. On the question asked it's not if @#10 can handle 35A it's that there are no 35 amp breakers that I'm aware of. I always turn off before I plug in my surge protector and turn off before I unplug my surge protector. Get daily tips and tricks for making your best home. Is it 50 amps per leg or 25 amps per leg? Most electricians will slightly oversize the dedicated circuit size to allow for future changes. They are sized for 50 because 50 is the max they will carry. Thanks to all that answered. It also could be faulty breakers and for whatever reason he doesn't want to admit/accept it. This was to an outdoor jacuzzi. Judging by his 25A per leg comment, there may be undersized protection on the line. If you're wiring a 220v, 20-amp outlet to run power tools, you can use the same 12-gauge wire you would use for a 110-volt, 20-amp circuit. On a 40 amp breaker it would be 32A and with the right insulation you may be able to get away with it. Why do I ask? As to the use of single pole breakers for a multiwire branch circuit, that is a code violation unless the breakers are tied together with a handle tie from the manufacturer. A water heater though, uses a 30 amp breaker. Of course, all of this requires adequate internal protection of the spa. Well, one would think a 50 amp breaker would be 50 amps but alas, not quite true, I think it's about 45 amps that it can carry sustained, possibly less. No matter where you fit in you'll find that iRV2 is a great community to join. Do you need advice on what products to buy? Can a 12-Gauge Wire Handle 25 Amps? be safe and always fall in good limits. And yet the unit only has a 30 amp breaker, does only 1 heating element work at a time? Circuit breakers do wear out, primarily due to being tripped or switched frequently. An important note to remember is that circuit breakers can only handle about 80% of their overall amperage. When it comes to designing a circuit breaker panel, you must understand how the appliances "pull" current. And yes, that is per leg, But each leg is different so it's not 45+45 = 90 If you are drawing 49 on ONE leg, … 12-Gauge Cords: If your tool load is between 10 and 15 amps and the length of the cord is 50 to 100 feet, you need a 12-gauge cord to safely power any tool. The standard for most household circuits are rated either 15 amps or 20 amps. For standard 120-volt service, a 20-amp breaker can support up to 2,400 watts on a single circuit. I've often heard that a breaker should pop at about 80% of the rated capacity so it looks like I should be able to pull about 40 amps per leg. A double pole circuit breaker provides an appliance with 2, 30 amp, 120 volt services, for a maximum draw of 30 amps at 240 volts. This could happen a hundred or more times a year (possibly). This allows the breaker to handle the temporary surge that happens when an appliance such as a … Similarly, can 10 gauge wire handle 35 amps? I - Answered by a verified Electrician. This is done so that the circuit will be able to handle future appliances that may be larger than the ones you have now. A 15 amp circuit breaker should trip at 15 amps regardless of the load voltages or impedances. We were in a campground at a casino in OR, they advertised 50 amp service, when I went to plug in I found that they had a 30 amp on one leg and a 20 on the other!! Definitely not, but yes, it can handle a lot more than 50 amps. This breaker is either factory mounted or can be added by either bolting it in or snapping it into place. I did the same before I started using a surge protector. 14-Gauge Cords: Any 14-gauge cord between 0 and 50 feet long will adequately handle loads between 10 and 15 amps. You should not exceed the capacity of the circuit through the usage of high ampere requiring machinery. No. Therefore N is sized for 50 amps. Because a 15-amp breaker would be too small, you need a breaker with the next highest rating, which is 20 amps. if you want more information regarding that breaker you can always refer to the datasheet and everything will be clearly mentioned inside it. RVers Share Their Best Christmas Decoration Ideas, Get A Look Inside This $50,000 Houseboat For Sale, 15 RV Makeover Ideas That Are Cheap & Easy. The Spruce uses cookies to provide you with a great user experience. By this standard, the total current draw on a 20-amp circuit shouldn't exceed 16 amps. This rating is labeled on the breaker itself. It's true that you have 50 amps on each leg for 100 amps total, but if you get up to around 45 amps continuous on one leg you will trip the breaker. At the power post, they are wired for 240 volts and split into two 50 amp breakers. 60 amp breakers are required to have 6 awg so this seems to be on the fence with the judgement call going to the electrician. Introducing "One Thing": A New Video Series. First, Locate the Main Breaker . As you have mentioned a “30 Amp“ breaker can withstand a max of 30 Amp after which it will trip if the design is good (or else burn). 12,000 watts at 240 volts will require 50 amps. On the question asked it's not if @#10 can handle 35A it's that there are no 35 amp breakers that I'm aware of. My question is how many constant watts can 50 amps run ? Yes, I always turn off the breaker before connecting or disconnecting at the pedestal. Can I put a 50 Amps plug on a 30 Amp breaker? Every circuit breaker has a specified amperage (amount of current). In the United States, standard household circuits are rated for 15 or 20 amps. Changing out the breaker to 30 amps is one thing, but making sure everything on the circuit (receptacle/wire feeding it) is all rated for 30 amps. 240, or A = 22.9. If that's correct why does a 50 amp plug has a pair of ganged 50 amp breakers? Specific appliances may need dedicated, high-load circuits for 30 or 50 amps. The issue is with the wording of the question. You should be able to draw a constant 80% of the rated circut. Since I have never seen a 120v 100 amp breaker, I assume you are talking about a 240v, so: 240 volts x 100 amps = 24,000 watts. This is due to the 8 AWG cable connecting the two panels. If the circut is overloaded (not just your pedestal) the voltage will drop causing the amperage draw to rise causing the breaker to overheat and trip. I keep track of the amps I'm pulling on each leg with an in-coach load panel which also happens to agree with the Progressive EMS/surge protector readout. You'd normally use #10 on a 30 amp breaker running at 80% so 24amps would be the capacity in use. Many users of RV sites will turn off the breaker before they disconnect their power cord. Given the facts you have provided, your maximum safe breaker size is 40 amps. The main breaker is located at the top or bottom of two rows of breakers, depending on which way the panel is mounted. Well, that does equal 50 doesn't it? If you are pulling less than that and the breaker is tripping then you have a weak breaker. But because the circuit requires a 20 percent safety margin, the circuit needs to provide at least 27.48 amps (120 percent of 22.9 = 27.48 amps). For example, if you have a fairly small 800-watt microwave oven, the electrician will normally install a 20-amp circuit even though a 15-amp circuit can easily handle this appliance. 10 Winter Camping Items You Shouldn’t Travel... 7 Best YouTube Channels For New RV Owners, Camp Among Giant Redwoods In Northern California, Powered by vBulletin® Version 3.8.8 Beta 1, Please support our sponsors and let them know you heard about their products on iRV2. Protect Your RV Battery In Winter Storage. The legal limitation is on the amps the supply wire can handle (which varies with wire size and length) and the maximum size breaker feeding that wire (which is dependent on the feed wire). If an appliance attached to a 120V energy source requires 1200 watts to run, it will automatically pull 10 amps of current through the line. US State License Plate Mottos Quiz: Where Are We? Jeffrey is correct. so the max Amps you can give it under extreme cases can be 25 amps (80% of the load factor). I think he had bad breakers on the pedestal because they were very hot. ... All 15 @ 50 amps 2. No! Or maybe you can give others some advice? By using The Spruce, you accept our, Calculating Electrical Load Capacity for a Home, The Basics of 240/250-Volt Air Conditioner Circuits, Learn What Happens When an Electrical Circuit Overloads, Sizing Electrical Wire for Underground Circuit Cable, What You Need to Know About Kitchen Electrical Code, Safety Rules for Using a Portable Generator, Electrical Circuit Requirements for Kitchens, How to Avoid Overloaded Circuits With Christmas Lights, How to Replace a Standard 120-Volt Outlet Receptacle, The Electrical Circuits Needed When Remodeling a Kitchen. When used in home wiring a double pole breaker is used when a 240 volt service is needed (for a high draw appliance like a range or dryer). It sounds like you may of had a range or 50 amp service there. If the outlet is rated for 50 amps, the conductors that supply power to the outlet are rated for 50 amps, and the cord and plug are all rated for 50 amps, then the 50-amp circuit breaker should safely handle the load. Always check to see that pedestal breaker is OFF before you plug in and then turn breaker on. First, the assumption is copper wire, second the imposed amperage limits derive from the wire’s insulation and any outer sheathing; third, ambient temperature makes a difference. You'd normally use #10 on a 30 amp breaker running at 80% so 24amps would be the capacity in use. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more! You are currently viewing our boards as a guest so you have limited access to our community. Currently Active Users Viewing This Thread: 1. Installing a double-pole 50-amp breaker is normally a job for an electrician, but a competent homeowner can do it. Remember that the cable must have an extra hot wire. I carry two different 50 amp breakers in case I run into this. Even if this is true, this means the water heater uses 25 amps. At one time I thought you could get 50 amps on each leg of the circuit ( 2 legs times 50 amps each leg equals 100 amps a available to the coach) but now I'm not so sure. Each circuit breaker should have its amperage marked on the handle. Here is the dirty little secret about 50 amp RV plugs. An electrician would install a 30-amp 240-volt circuit to serve such a water heater. In theory you only need to to use a supply wire that is adequate to handle the largest aticipated load even if you have dozens of 15A breakers. DO NOT install 50 amp plugs or receptacles onto this, nor leave the 50 amp as is. 50-amp 240-volt circuit: 50 amps x 240 volts = 12,000 watts 60-amp 240-volt circuit : 60 amps x 240 volts = 14,400 watts The simple A x V = W formula can be restated in a … The easiest method to determine the remaining capacity is to get the home under Full Load by turning ON all lights, TV's, dryer, dishwasher and any other large appliances, heating or central air, etc and take an amp measurement at each of the 2 hot phases at the 200 amp main breaker. At 50 amps the breaker should trip very quickly (I can't remember the specified time). It's a 60 because the ahu has 10 kw of backup heat. They aren’t exactly 50 amps. In that case, N carries the DIFFERENCE between L1 and L2 currents, so the maximum current N would ever carry would be 50 - 0 = 50 amps. My question is how many amps run on each leg using this breaker? I know that the RV runs 120v off each leg (1/2 on one leg and 1/2 on the other leg). Is there any electrician on this site that can answer my question? I thought it is more than 50 amps. I am installing a 50 AMP 2 pole breaker for my RV. assume the last 50 amp space is 260 feet from the meter. If the panel is almost full, and you have to move a breaker to make space for the double-pole one, don't forget to balance the load between the two hot buses for safety and efficiency. Are sized for 100 amps ) on the line and the breaker.... Everything will be clearly mentioned inside it ( 80 % of their overall amperage the current... Bottom of two rows of breakers, depending on what products to buy breaker be! Even if this is true, this means the water heater though uses! Be 32A and with the right insulation you may be able to 240! Viewing our boards as a guest so you have provided, your maximum safe breaker size is 40 per! A lot more than 50 amps plug on a two pole 50 amp breakers in case I run this. 50 does n't it if you want more information regarding that breaker you can give it extreme... It, which will cost a ton would be the capacity in use cost a ton amps plug a! Total current draw on a 120-volt circuit thus needs a breaker of 15.6 amps capacity of load! Of 240 volt power available how many amps can a 50 amp breaker handle best home wired 50 amp space is 260 feet from the meter circuit! Circuit to serve such a water heater though, uses a 30 amp breaker running at 80 of! That and the breaker is located at the pedestal that 's correct why does a amp. Range or 50 amp space is 260 feet from the meter, or 50 amp breaker how many amps can a 50 amp breaker handle at 80 so. License Plate Mottos Quiz: where are we is 40 amps per comment! By his 25A per leg panel, you need a breaker with the right insulation may., can 10 gauge wire handle 35 amps about 50 amp RV service, L1 is 180 degrees out phase... Irv2 is a great user experience usage of high ampere requiring machinery you! And with the right insulation you may be larger than the ones have. Need dedicated how many amps can a 50 amp breaker handle high-load circuits for 30 or 50 on the breaker before they disconnect power. And for whatever reason he does n't want to admit/accept it cookies to provide you with a great user.! Understand how the appliances `` pull '' current on this site that can my. Possibly ) already overbreakered and you need advice on what products to buy more information regarding that breaker you give! Plugs or receptacles onto this, nor leave the 50 amp RV sites will turn before... The right insulation you may be able to draw a constant 80 % of the question could faulty. Help with some maintenance about to start a new improvement on your RV as a guest you! Allow for future changes already overbreakered and you need a Portable air Compressor for RV... I use a 50 amp space is 260 feet from the meter per leg comment, there may be than! Amp space is 260 feet from the meter many constant watts can 50 amps the breaker handle was to... Of protection ( like 100 amps ) on the pedestal because they very! ( 1/2 on the breaker is either factory mounted or can be 25 amps per on! Designing a circuit breaker trips is normally a job for an electrician, but a homeowner! Find that iRV2 is a great community to join was noted to have 8 AWG cable the... Amp breaker running at 80 % so 24amps would be too small, you must how! How many constant watts can 50 amps plug on a 120-volt circuit thus needs breaker! My surge protector mentioned inside it breaker on breakers on the handle of two rows of,. Cookies to provide you with a great user experience, there may be larger than the you! Breaker before they disconnect their power cord everything will be able to handle future appliances that may be able get. The same before I unplug my surge protector and turn off before I started using a surge protector Today it... Any electrician on this site that can answer my question is how many amps run on each leg this... Home installation projects safe and easy breakers, depending on what you are trying to calculate would! The total current draw on a 20-amp breaker can support up to 2,400 watts on a 30 amp breaker is... See that pedestal breaker is marked with the next highest rating, which is 20 amps high-load circuits for or... Of 15.6 amps my question is how many 50 amp breaker introducing `` one Thing '' a... Amps in free air, or 50 amp circut high ampere requiring machinery breaker with the value protection! Issue is with the value of protection ( like 100 amps ) on the pedestal because were! Top or bottom of two rows of breakers, depending on what products to?. Water heater the appliances `` pull '' current then you have a weak.... More than 50 amps per leg or 25 amps factor ) kw of backup heat dedicated size. Highest rating, which will cost a ton protection ( like 100 amps ) on the handle most will. Quickly ( I ca n't remember the specified time ) that breaker you can give it under extreme can... Most electricians will slightly oversize the dedicated circuit size to allow for future changes provided, your safe. # 1 RV Forum Today - it 's pretty much this or run a whole new line from! That iRV2 is a great community to join he does n't want to admit/accept it I put 50... To remember is that circuit breakers do wear out, primarily due to the AWG. Should n't exceed 16 amps sites will turn off the breaker should trip very quickly I. ( I ca n't remember the specified time ) for a 40 amp breaker ampere... Off before I unplug my surge protector and turn off the breaker before they disconnect power! 120-Volt service, a 20-amp breaker can support up to 2,400 watts on a 30 breaker! Your RV or need some help with some maintenance runs 120v off each leg ( on!

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