200. Although you cannot exceed current ratings on any branch circuit without tripping that circuit.
You need to make sure that you do not exceed 160 continuous load amps to meet NEC requirements of not overloading a breaker to more than 80% under continuous load.
First, determine the current draw of the coffee roaster, then check the breaker size. Using the formula, Watts = Amps * Volts, determine if the current draw of the coffee roaster is anywhere near the maximum current draw of the breaker. For example, if the roaster is using 14 Amps, and the circuit breaker is rated at 15 amps, that doesn't give much room for anything else on the circuit. Add up all of the current of all devices on the circuit (the one that trips the breaker) and either move things around so that you don't have too much load on a single circuit, or you may need to bring in an electrician to run a new circuit. If you are ABSOLUTELY certain that your appliances are nowhere near the rating of the circuit breaker, you could have a faulty breaker, in which case, bring in an electrician to replace the breaker.
You need to look at the rating on the fans to see how much current they draw including lighting. Add up the currents and stay below 16 amps for the 20 amp breaker and below 12 amps for the 15 amp breaker. If all fans were to start at the same time the excess starting currents could trip the breaker.
You can, but your circuit will be "protected" by a 30 amp breaker. So you'll have to consider the safety issues of having wiring and appliances that can draw up to 30 amps before tripping the breaker. Will the wiring and circuity support that much current without damage? If not, then switch to a 15 or 20 amp breaker.
The circuit breaker protects the wire from getting too much current. Too much current could cause the wires to over heat and possibly start a fire. The size of the wire determines the number of amps that the wire can handle safely, so the number of amps on your circuit breaker should be based on the size of the wire.
'Electricity' is not a quanitity, so you cannot have 'too much' or 'too little' electricity! On the other hand, if a load draws too much current, then it may cause a circuit breaker to open. Circuit breakers are 'overcurrent' protection devices, which will operate in the event of an overload current or a short-circuit current.
Your washing machine should be on its own dedicated circuit. When it runs it draws current. If the current exceeds the breaker rating the breaker will trip. You didn't say anything about the circumstances so it is hard to pin down the cause. Some possibilities are: 1. A bad breaker. 2. There is some obstruction or binding on what the motor is trying to turn and it stays in an over-current start up mode trying to overcome the mechanical loading. 3. There is a short circuit in the windings in motor causing it to draw too much current. 4.There is a short circuit in your wiring to the washing machine. If breaker blows immediately when you turn on washer the problem is likely 1, 3 or 4. If it happens somewhere in the cycle it is likely 2.
The trip coil has the whole circuit load amperage flowing through it. Thepurpose of the breaker is to only allow current up to its trip point. That is the only way that the breaker can sense if the current is within the limit rating. If the circuit load amperage becomes greater that the breaker rating it will trip. The trip coil that you refer to is a magnetic trip which senses the magnetic field that surrounds the wire. Breakers also have a thermal trip which senses a heat build up on the current flowing through it. If the breaker is in a high ambient temperature it will lower the rating on the breaker.
Typically a washing machine and gas dryer don't use a motor larger than 3/4 hp, and other than the timer, they don't typically have much of an additional current draw. Most 3/4 hp motors pull about 6.5 amps, putting the total current load of both devices at 13 amps. You shouldn't have trouble putting them both on a single 20 amp circuit, provided that there are no other devices on the same breaker, AND provided that the washer and dryer do not draw much more than estimated. Understand that all manufacturers have their own idea of what the perfect washer and dryer should be like, so you may need to verify the current draw of each device before making assumptions. And understand that the current load on a breaker should not exceed 80% of it's rated capacity, meaning that the total current draw of the two devices shouldn't exceed 16 amps.
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