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Are circuit breaker panels chosen by total amperage of all circuit breakers in the panel?
Wiki User
∙ 13y ago
Most often if you add up all the breaker values in a panel they will exceed the rating of the panel. The theory is that you never operate each breaker to its full capacity. The panels are sized to the maximum current that is capable of being supplied by the electric company equipment servicing your house.
Correction: Panels are sized according to the outcome of a complicated process of estimating the maximum number of amps that are likely to be used at any one time. This gives you a minimum size and you install AT A MINIMUM the next larger size panel. I don't know of a maximum size by code but there are limits to what can be practically used.
In the absence of this complicated process, there are some rules of thumb that are substituted on houses. These range from 100 amps to 200 amps.
Wiki User
∙ 13y ago
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It depends what circuit you are making.Circuit breakers come in different 'ratings' and so are chosen according to the power demands of the circuit you have.You don't choose a circuit for a circuit breaker as such, you choose a circuit breaker according to what circuit you have made.
Is it better to have a high or low resistance across a circuit breaker?
A circuit breaker is supposed to protect the more valuable component the circuit is connected to. Too low a resistance, a minor glitch (spike) will break the circuit and stop the device from working. Too high a resistance, no glitches, no matter how large (a child sticking a paper clip into the wall sockets, for example), will break the circuit and the device (child) may get damaged. Each circuit will have a purpose (power load), and the circuit breaker should be chosen for that purpose with some tolerance. A free standing closed circuit breaker should have no resistance across its internal contacts. The main purpose of a circuit breaker is to protect the conductors that supply the load. If the current going to the load becomes greater that the amperage rating of the wire the circuit will open thereby saving the conductors from damage. Once the load current is below the wire rating ampacity, the breaker can be reset for normal operation.
What size of circuit breaker should you use for a lighting circuit?
To correctly size a lighting circuit, you must know the total power that the circuit will draw, in watts. For example, if there is 7 lights on a circuit, each light consumes 100W, that gives you a total of 700W on the circuit. Then you must know the voltage that is being supplied to the circuit. For this example, 120VAC will be used. To calculate the current needs for sizing the breaker, use the formula P=E*I, where P=watts, E=voltage, I=current/amps. So, in this example, P=700, E=120, I is unknown. After working the formula, you have an answer of 5.83 A. Breakers generally come in sizing increments of 5A.....5A, 10A, 15A, 20A, etc. The answer for this example was 5.83A, so the 5A breaker is obviously not enough. The next size is 10A, which is more than the calculation, but you must also consider that breakers are designed to operate at 80% capacity for periods of time over about 3 hours. So for an office atmosphere where the lights will definitely be on for longer periods of time than residential (in most cases), you would need to make sure that the total Amps needed is equal to or less than the 80% of the breaker size you have chosen. A 10A breaker is only designed to provide 8A of capacity for longer periods of time. So for this example, a 10A circuit breaker would be properly sized. You must also abide by the NEC code for maximum number of fixtures on any particular circuit. Refer to NEC for that information. If you were to change the light fixtures to a larger size, such as 200W each, you would then find that you need to also change the breaker and possibly the wire size that is run through the circuit, to maintain compliance with NEC.
Can you run a 40 amp breaker 65'?
This question is at cross purposes. A breaker is used to protect the conductor that is connected to it. With a distance being added into the question it turns it into a voltage drop question. Depending on what the amperage of the connected load is, a 40 amp breaker might protect the conductor. A voltage needs to be added to the question. Re-phase the question to include a voltage, and load current. For example, What size wire is needed at (voltage here) with a load amperage of (amperage here) over a distance of (distance here). Once the wire size is established then a breaker is chosen. It also helps to know what the load is, eg. motor, sub panel, transformer, because additional calculations need to be made.
Can you buy just a circuit breaker?
Yes, you can purchase a circuit breaker just as you can purchase a wall switch. Big box home stores and hardware stores carry circuit breakers. You should know that they can be a bit expensive, and they are not returnable. Additionally, there are several different types of breaker, and if you have an older electrical panel, you might have to do a bit of calling around to locate a breaker that is made for that setup. The last thing you need to know is that experimenting with electricity by tinkering with a home electrical distribution system can be fatal. Electric shock can kill the careless or less-than-knowledgeable do it yourselfer. Or an electrical fire can damage the home, and endanger anyone home at the time. Damage to equipment that is incorrectly wired is possible, but that pales compared to the other two hazards. Replacing a breaker is not extremely difficult, but exposes the worker to hazards that must be managed. Opening the mains breakers to completely de-energize the panel busses is the smartest route. Naturally an exact replacement will have to be chosen, particularly as regards the trip rating. And if you're adding a breaker to a panel to accommodate a new circuit, you'll have to have done the math to insure that the panel is rated for the additional circuit. That's in addition to insuring all that the other wiring meets code and is done in a workmanlike manner. Shortcuts or "amateur" work on electrical systems cause fires and can kill people. No judgment is passed, but the cautions cannot be overstated. A professional consultation is the best idea, and "experimentation" is discouraged.
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Amperes are the units; 'I' is the symbol chosen to represent amperage.
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How many watts to operate 12 volt caravan fridge?
The watts or amperage should be stated on the nameplate of the fridge. If you are trying to find the size of a wire needed to connect the fridge to the electrical system an amperage needs to be calculated. If the watts of the fridge are known use this formula to find Amps = Watts/Voltage. Once the fridge's amperage is known, a correct wire size can be chosen and the proper fusing to protect the wiring put in place.
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What size wire for a 240 volt 8800 watt stove?
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Why are fuse wires used in some electrical circuits in some electrical appliances?
Fuse wire is designed to blow if a short-circuit or other fault occurs, so preventing the cables or components from burning-out. It is important to use fuse wire at the lowest amps. For instance, most appliances will come with a 13 amp fuse in the plug. If the plug is for a lamp, then 13 amp is too high. I would change the fuse to a 2 or 3 amp. A 13 amp fuse is for appliances up to 3000 watts. If in doubt ask an electrician.
