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This is an interesting question with unfortunately not quite enough information for a good answer. But I'll give you a few things that could cause this situation and the conditions in which they will occur.
1. This problem has always occurred: The wiring/circuit breaker that controls the unit are not rated high enough to accommodate the unit. Make sure that both are rated for the draw listed on a tag somewhere on the unit.
2. This is a recent problem that is getting worse with time: The wiring going to the unit degrades with time, as does the circuit breaker itself, limiting their ability to carry current to the unit causing it to try and draw more amperes than the breaker will allow. Replace the wiring and/or breaker with the appropriate size needed for your application.
3. This happens at times when there are a large amount of electrical items on in your dwelling. This means that the circuit may be being used to power other devices as well, and combined they are overloading the breaker. This is unlikely as the unit should have a dedicated circuit. Remove all other devices from the circuit, or run a new circuit to the unit of the appropriate rating.
4. This is a recent problem and is consistent in the time it takes for the breaker to trip. The wiring may have been damaged in some way, such as a mouse chewing on the wire, or a nail/screw being driven through it. This is the most dangerous of the options as it could cause a fire when you reset the breaker. Check the wiring for damage, and replace it with the appropriate size for your application.
I highly recommend that you seek out an electrician to rectify this problem. Not a Handyman, or someone of that nature, but a true licensed Electrician. This could be a serious problem that puts you, your home, and your family in danger.
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∙ 14y ago
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What would cause a 15 amp circuit breaker to throw after 5 hours?
Operating a breaker on a continuous current, close to the breaker's tripping point can cause this condition. Because the breaker is a thermal device the heat builds up over a time period. Check the breakers on either side of the faulting breaker. If these breakers are also warm from use they take away the heat sink effect and do not let the faulting breaker cool down. Check the current of the load to see how close you are operating to the breakers trip point. Over time the trip setting of the breaker can become lower to a point where it will not reset. Changing the breaker out should rectify this non resetting condition.
Can circuit breakers help to prevent building fires?
Breakers limit the current on the conductor to a safe level, too many appliances plugged in. You trip a breaker, hopefully you then transfer load to another circuit. Breakers use two different methods to accomplish this, one uses a bimetallic strip and the current passes directly through, too high a current causes the strip to deflect. It acts on a mechanism much like the sear in a guns trigger, the deflection pulls the trigger causing a spring to open the contacts and turn off the circuit. Another type is thermal magnetic, current passing through the breaker causes a magnetic field to act on a coil tripping the breaker. When breakers are wired and work properly they prevent fires!Bending metal opens a switch
How does a circuit breaker operate?
A circuit breaker can be magnetic; the higher the current is the stronger the magnetic field will be, if the magnetic field gets strong enough it will pull open the circuit. A circuit breaker can also be thermal; as current travels through the circuit heat is generated (higher current = more heat), in the breaker there is two different kinds of metal bonded together, each will expand and contract at different rates, since they are bonded together they will bend and trip the circuit open. A circuit breaker can be a combination of magnetic and thermal.
Should a circuit breaker get hot on very hot days?
If a breaker isn't tripping, yet still feels quite warm, you probably are close to having too many appliances on its circuit. Breakers trip because of overloads (too many appliances), or shorts ( bare wires touching each other). These situations are quite dangerous and need to be corrected. If you can't find the problem, contact an electrician right away, and keep the circuit off.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 JOBSAFELY AND COMPETENTLYREFER THIS WORK TO QUALIFIED PROFESSIONALS.
Why shouldn't you connect two wires to one terminal?
If you are referring to a circuit breaker in an electrical panel, each circuit breaker is designed to trip at a preset amperage rating. The NEC (national electrical code) only allows one circuit, rated at no more than 80% of the breaker rating to be fed from each circuit breaker. Generally the builder will design the electrical layout of any building to maximize and to most effectively balance the load for lighting and receptacles. Adding another circuit wire to the load side of the breaker already in use could have a potential for overload which could cause the breaker to heat up and trip, not to mention that it complicates things during troubleshooting. New circuits or other wire additions must have their own breaker.
What makes a circuit breaker go bad?
A circuit breaker can go bad from being tripped too many times. Many people don't understand that the tripping of a circuit breaker indicates a problem that needs to be corrected. They usually just reset the circuit breaker, leading to a very common second (or third, or fourth) trip. Circuit breakers tripping are for the prevention of fire due to excessive heat in the circuit. They're not supposed to be tripped repeatedly. This can wear the breaker out. Believe it or not, I've also seen circuit breakers fail to re-energize after being turned off. I speculate this was actually caused by the breaker never having been cycled (it was a main breaker), and the time elapsed since it was installed. Electrical equipment doesn't last forever. It's the same as anything else.
How do circuit breakers apply to expansion?
A circuit breaker works by tripping a switch when too much current passes through it. As you may know, the higher the flow of energy, given a fixed resistance, the more heat will be generated. Because of this property, the heating of a metal strip (usually made from 2 different types of metals, so that it bends) is the mechanism for circuit discontinuation in a circuit breaker.
Purpose of a breaker in an electrical circuit?
Breakers ensure that when too much amperage is being drawn through the circuit the power is shut off. Excessive amperage creates heat. Without a breaker that heat buildup could lead to fire.
What would cause a 15 amp circuit breaker to throw after 5 hours?
Operating a breaker on a continuous current, close to the breaker's tripping point can cause this condition. Because the breaker is a thermal device the heat builds up over a time period. Check the breakers on either side of the faulting breaker. If these breakers are also warm from use they take away the heat sink effect and do not let the faulting breaker cool down. Check the current of the load to see how close you are operating to the breakers trip point. Over time the trip setting of the breaker can become lower to a point where it will not reset. Changing the breaker out should rectify this non resetting condition.
Air conditioner blows circuit breaker when heating?
If you have a heat pump and the breaker blows in heat cycle then you probably also have auxiliary electric heat which is drawing too much current because of a faulty heater element.
What dangers are associated with overloading plug sockets?
You can overload the circuit, causing a heavy load on the breaker. If the house wiring is old, it can build up heat, espeacially in an attic and create a "hot-spot" potentially causing a fire. Any microwave of 1,000 watts or larger needs to be on its own breaker. A curling iron or blowdryer can overload a circuit in your bathroom, and trip a breaker if it is being shared with other appliances on the same breaker. Always consult an electrician if your having troubles tripping breakers or blowing the older-style glass fuses in your house.
Can circuit breakers help to prevent building fires?
Breakers limit the current on the conductor to a safe level, too many appliances plugged in. You trip a breaker, hopefully you then transfer load to another circuit. Breakers use two different methods to accomplish this, one uses a bimetallic strip and the current passes directly through, too high a current causes the strip to deflect. It acts on a mechanism much like the sear in a guns trigger, the deflection pulls the trigger causing a spring to open the contacts and turn off the circuit. Another type is thermal magnetic, current passing through the breaker causes a magnetic field to act on a coil tripping the breaker. When breakers are wired and work properly they prevent fires!Bending metal opens a switch
How does a circuit breaker operate?
A circuit breaker can be magnetic; the higher the current is the stronger the magnetic field will be, if the magnetic field gets strong enough it will pull open the circuit. A circuit breaker can also be thermal; as current travels through the circuit heat is generated (higher current = more heat), in the breaker there is two different kinds of metal bonded together, each will expand and contract at different rates, since they are bonded together they will bend and trip the circuit open. A circuit breaker can be a combination of magnetic and thermal.
What is the Function of circuit breaker?
The purpose of a circuit breaker is to open the circuit in the event of an overload. Wires/conductors are only rated for a specific Amperage. If this amperage is exceeded the conductor/wire begins to heat up and given enough time it becomes a fire hazard. For instance a 15 amp breaker will trip once the Amps drawn through that circuit exceed 15 amps. The short answer is to keep you safe.
Should a circuit breaker get hot on very hot days?
If a breaker isn't tripping, yet still feels quite warm, you probably are close to having too many appliances on its circuit. Breakers trip because of overloads (too many appliances), or shorts ( bare wires touching each other). These situations are quite dangerous and need to be corrected. If you can't find the problem, contact an electrician right away, and keep the circuit off.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 JOBSAFELY AND COMPETENTLYREFER THIS WORK TO QUALIFIED PROFESSIONALS.
What is a function of a circuit breaker?
The purpose of a circuit breaker is to open the circuit in the event of an overload. Wires/conductors are only rated for a specific Amperage. If this amperage is exceeded the conductor/wire begins to heat up and given enough time it becomes a fire hazard. For instance a 15 amp breaker will trip once the Amps drawn through that circuit exceed 15 amps. The short answer is to keep you safe.
Will changing circuit breakers in box for electric heat reduce heating bills?
No, all it will do is make the circuit unsafe if a larger breaker is installed or make the circuit trip unnecessarily if a smaller breaker is installed. You pay for the wattage that you use. Less wattage used, less cost on your utility bill.
