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Can you add a 20 amp breaker to main breaker if total breaker amp is 320 amp Main breaker max is four 150 amp breaker?
Total amps or calculated load has nothing to do with the number of breakers and their sizes. It is more complicated than adding the sum of the breakers, if you do that you will see that they would exceed 200 amps.It is based on square footage for the general receptacle and lighting loads,3000 watts is allowed for small appliances and this is just the beginning.Some experienced electricians have trouble with the calculations.If you are trying to see if you have enough capacity for an addition or some upgraded equipment,and you have breaker space,the chances are you will be O.K. Overloading the service would cause the main to trip.
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.
What are the causes of fire on MCB?
loose screws or corroded cables or over current above breakers rating (faulty breaker not tripping when meant to) internal fault with breaker.
What do circuit breakers and fuses have in common?
Both fuses and circuit breakers cut off a circuit from its power supply when the total current through the circuit exceeds the current rating of the fuse or circuit breaker, usually due to a short to ground or overloading of the circuit. Both use materials that respond to heat.
Was changing a 30 amp breaker when I reset the main breaker there was a delay before power came back on?
Something is not right. My guess would be the main breaker is old and deteriorated. Breakers need to exercised to keep them operating free. Open and close them several times every six months. Hardened grease or corrosion will cause them not to snap over quickly or may have dirty contacts inside which delayed "make up" after some current burned through them. Check to make sure it is not getting hot or arcing which could cause a fire.
Why are circult breakers preferable to fuses?
Circuit breakers are preferable to fuses because they can be reset after tripping, while fuses need to be replaced. This makes circuit breakers more convenient and cost-effective in the long run. Circuit breakers also provide better protection against overcurrent and short circuits.
What would cause a breaker to trip?
A breaker will keep tripping until the fault that caused it to trip is corrected. That's what it is designed to do. There's either a circuit overload or a short circuit. How fast the breaker trips can indicate how overloaded it is. If you are very close to the rating of the breaker you can actually trip it over time. If you are definitely over the breaker will usually trip instantly. If there is a short circuit you can usually tell that by how violently the breaker trips. If you have conduit you can hear the wires banging around in the pipe. A frequently tripping breaker may also be faulty and need to be replaced - breakers are designed to fail by tripping prematurely rather than by not tripping at all, as this is much safer. This is very often the case for breakers that trip at seemingly random intervals, often when very little load is being drawn.
Why is it important that homes have circuit breakers?
Fuses and circuit breakers are meant to protect your home's wiring from the heat generated from fault-currents and over-currents. Over-currents happen when you exceed the amperage the fuse or breaker is rated for over a period of time (IE: drawing 20 amps on a 15 amp circuit breaker). When this occurs a fuse or circuit breaker will open the circuit so the wiring in your home will not be damaged. Over-currents happen when electricity finds a path, other than the one intended, to ground. When this happens there is very little resistance to slow the flow of electricity and the amperage through the circuit can exceed the fuse or circuit breakers rated capacity by several hundred times . These type of faults cause the fuse or circuit breaker to open the circuit very quickly.
What is the place in the home that contains the circuit breakers?
The ciruit breaker box. This is usually mounted near the main power source in the home. Try the basement, the back porch, or near the kitchen. If all else fails, go outside and look where the power meter is. The breaker box should be nearby inside the home. In many homes the electrical panel is in the basement. In homes that do not have basements the electrical panel is placed in the garage.
How many breaker and what size breakers can i use in a 200 amp service?
The rating of a main breaker panel has no direct relationship to the "cumulative total" of the ratings of its installed breakers. Any such notional direct relationship or "limit" is totally immaterial and misleading and could be the cause of serious misunderstandings about the way a breaker panel can be fitted with circuit breakers.Put in very simple terms, because the branch circuits in an installation are unlikely all to be fully loaded during any period of time, the wiring codes and regulations allow the total number of breaker-amps to exceed the maximum total rated amps of the breaker box, but how to decide how much that excess can be is something professional electrical engineers and licensed electricians learn how to calculate and assess as part of their detailed professional training.For more information see the answer to the Related Question shown below.The maximum total amperage that can flow from the panel's main breaker to all the individual breakers at any time is limited to the rating of the panel's main breaker. This question mentions that the main breaker is rated at 200 amps. Any amperage over that will trip the main breaker thereby protecting the service supply conductors.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.
You have an elecwaterheater it blows the20amp in line breaker and the 50 amp main?
For a main breaker to trip under these circumstances the rest of the panel is becoming close to its load rating. When the 20 amps breaker trips the rest of the panel is close to or over 30 amps, the 20 amp breaker takes it over the top. What trips a HWT breaker is usually a faulty heating element. It could be the top one or the bottom one.
What is a Circuit breaker and explain type circuit breakers?
A circuit breaker is a switching device which can make,brake and carrying (or trip the circuit) that specified over currents for a small interval of time . There is a different types of Circuit Breaker's are there 1.According to their arc quenching media these are divided into 4 types a) Oil circuit breaker b) Air blast circuit breaker c) SF6 circuit breaker d) vacuum circuit breaker 2. According to their services the circuit breaker can be divided as a) Outdoor Circuit Breaker b) Indoor Breaker 3. According to the operating mechanism of circuit breaker they can be divided as a) Spring operated Circuit Breaker b) Pneumatic Circuit Breaker c) Hydrolic Circuit Breaker 4. According to the voltage level of installation these are divided into 3 types a) High Voltage Circuit Breaker b) Medium Voltage Circuit Breaker c) Low Voltage Circuit Breaker.
