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It depends on a number of factors. The size of the service wires, the meter rating, the main breaker panel rating, etc. will have to be rated for the amperage you want to go up to.

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โˆ™ 2005-03-16 04:01:30
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Q: Can you upgrade a 100A main circuit breaker to a higher amp?
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What size of electrical wire needed for 100A circuit breaker?

#2 copper


Can you change a 100 amp main breaker to a 200 amp main breaker if you also upgrade the service wire from the meter outside and your electrical panel itself is a brand new 100A box?

Your main breaker cannot exceed the rating of your panel.


If a 100a breaker keeps tripping?

If a 100 amp breaker keeps tripping there is an overload on the system.


What is moulded case circuit breaker?

Miniature circuit breaker is up to range of 100 A and smaller in current capacity in compared to MCCB. In MCCB the current carrying capacity less than 100A and other difference between MCB and MCCB is its making one is not moulded and second one is moulded


Is the amperage of a breaker for total amps combined or on each leg?

The breaker will trip at the amperage notated on the breaker. If it's 100A...it will trip at or around 100A. It does not matter if that breaker is physically tied to another 100A breaker. To understand this, imagine that you remove the mechanical tie from the two-pole breaker. Now you just have two 100A breakers. In actuality, you always had two 100A breakers. The mechanical tie does not change that. If you then powered two, separate 120 volt devices from the two breakers, each breaker would allow 100 amperes to pass to each of the devices before tripping. So why are they tied together? That is done when the two-pole breaker is to be used to power a 240 volt circuit. In AC current, electricity flows in both directions. In a 120 volt circuit, it flows "out" toward the device via the hot (generally the black wire) and "back" via the neutral (generally the white wire). Then the cycle reverses. It does this 60 times per second (60Hz). The amperage in the hot and neutral wires are the same (in the perfect world). Only the hot wire is connected to the breaker. In a 240 volt circuit, there is no neutral wire. You are using two "legs" of 120 volts each that are 180 degrees out of phase with each other. In other words, as leg 1 is flowing "out", leg 2 is flowing "back". Because they are out of phase, the potential difference is twice the voltage of each line or 240 volts. The current flows out and back at the same 60 Hz but this time via the two hot wires (generally black and red). Each of these hot wires are connected to the two terminals of the two-pole breaker. Due to mechanical tolerances, one breaker will most likely trip before the other. Therefore, if the rated current, (100 amps), is exceeded on either breaker, that breaker will trip and the other breaker will trip via the mechanical tie. This ensures that all power to the outlet is disconnected. If you removed the tie and only one breaker tripped, there would still be 120 volts connected to the outlet. In summary, each leg of a single, double (2 phase) or triple (3 phase) breaker is capable of allowing the amount of current denoted on the breaker. The connected circuit, regardless of voltage is protected from exceeding that amperage.

Related questions

How do you upgrade the service from a 120V 100A circuit breaker to 240V 30A for appliances like ovens and dryers?

Have an electrician wire you a proper line for the appliance. You were just kidding about the 100A, right? 10, or 20amp, not 100.


What size of electrical wire needed for 100A circuit breaker?

#2 copper


Do you need to upgrade the 100A service in your house to run power to a detached garage?

All depends on what type of equipment you are going to operate in the garage. I would suggest you call an electrician. You can connect to your existing 100 amp circuit if there is an empty spot for a breaker.


Can you change a 100 amp main breaker to a 200 amp main breaker if you also upgrade the service wire from the meter outside and your electrical panel itself is a brand new 100A box?

Your main breaker cannot exceed the rating of your panel.


If a 100a breaker keeps tripping?

If a 100 amp breaker keeps tripping there is an overload on the system.


What is circuit breaker and its type?

A circuit breaker(s) is what you will find inside your electrical box in your house the idea behind them is when a room in your house draws too many Amps the circuit breaker will turn off all the power to that room to re-engage them you simply switch it back on. There are many types of circuit breakers with different rattings like 15A or 100A, this tells you at what point they will 'break' the circuit and turn off the power.


What is moulded case circuit breaker?

Miniature circuit breaker is up to range of 100 A and smaller in current capacity in compared to MCCB. In MCCB the current carrying capacity less than 100A and other difference between MCB and MCCB is its making one is not moulded and second one is moulded


What cause the Main Breaker trips when I start a 30KW 3-phase Motor(Star Delt Starter)?

The wiring is like this:[[30KW Motor ---- Star Delt Starter(100A Breaker inside) ----- 200A Breaker------50A Breaker(Inside the breaker box which located inside the factory) -----100A Main Breaker]]Once I try to start the Motor, the Main Breaker trips immediately.


Is the amperage of a breaker for total amps combined or on each leg?

The breaker will trip at the amperage notated on the breaker. If it's 100A...it will trip at or around 100A. It does not matter if that breaker is physically tied to another 100A breaker. To understand this, imagine that you remove the mechanical tie from the two-pole breaker. Now you just have two 100A breakers. In actuality, you always had two 100A breakers. The mechanical tie does not change that. If you then powered two, separate 120 volt devices from the two breakers, each breaker would allow 100 amperes to pass to each of the devices before tripping. So why are they tied together? That is done when the two-pole breaker is to be used to power a 240 volt circuit. In AC current, electricity flows in both directions. In a 120 volt circuit, it flows "out" toward the device via the hot (generally the black wire) and "back" via the neutral (generally the white wire). Then the cycle reverses. It does this 60 times per second (60Hz). The amperage in the hot and neutral wires are the same (in the perfect world). Only the hot wire is connected to the breaker. In a 240 volt circuit, there is no neutral wire. You are using two "legs" of 120 volts each that are 180 degrees out of phase with each other. In other words, as leg 1 is flowing "out", leg 2 is flowing "back". Because they are out of phase, the potential difference is twice the voltage of each line or 240 volts. The current flows out and back at the same 60 Hz but this time via the two hot wires (generally black and red). Each of these hot wires are connected to the two terminals of the two-pole breaker. Due to mechanical tolerances, one breaker will most likely trip before the other. Therefore, if the rated current, (100 amps), is exceeded on either breaker, that breaker will trip and the other breaker will trip via the mechanical tie. This ensures that all power to the outlet is disconnected. If you removed the tie and only one breaker tripped, there would still be 120 volts connected to the outlet. In summary, each leg of a single, double (2 phase) or triple (3 phase) breaker is capable of allowing the amount of current denoted on the breaker. The connected circuit, regardless of voltage is protected from exceeding that amperage.


Is a 100A cicuit breaker sufficient for a small house?

I'm assuming you mean 100 amp service, not circuit breaker? The NEC code states the minimum service is 100A. Depending on your definition of "small", this would be sufficient. It all depends on your large loads too (Electric water heater, Air conditioner, electric range, etc). These appliances can pull some large amperage.


What is the max amps for a 4 gauge wire can 4 gauge feed a 100A breaker box?

Yes, # 4 AWG copper and 100 amps is the max.


Can you replace a 60amp box with a 100amp box if you swap the main breaker from 100 amp to 60 amp?

You would have to ensure that the service entrance cable can support 100A. Depending where you are located, you should inquire of your electricity provider if you are equipped for 100A. It may also require a meter change out.

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