No. You have to make sure that the associated wiring and any devices such as outlets or lights are rated for 15 Amps. The wiring has to be at least 14 Gauge (AWG). You also have to look at the overall panel amperage capacity. However, unless you are already having problems with breakers tripping you are likely okay on that account. If you are sure that all conditions are met for safety you can make the replacement. However, if you are not totally clear on any of this or the safe way to change a breaker, get an electrician.
Yes, providing the phase is the same. but you can't do the other way around, or breaker will immediately pop, or fuse will blow.
If the appliance is just to be plugged into a circuit with multiple outlets then you just need to make sure that the sum of currents for all devices on the circuit are less than the rated current. A rule of thumb is total current should be no greater than 80% of the rated current. So you might have a 20 A breaker and several 2.5 A appliances on this circuit. If you have a dedicated circuit for the appliance you would only need to size the breaker for the maximum current being drawn by the appliance. If the appliance contained a motor then there might be a start-up current that might be as high as 15 amps so you would likely go to a 20 amp breaker for a safety margin. As a practical matter a dedicated circuit for an appliance in the 2.5 amp range should have a 15 amp breaker. I always install a 20 amp breaker just for added margin and possible future applications.
If the 12,000 BTU A/C only requires 20 amps to run then yes you can use the same 12 gauge wire but you cannot change it to a 15 amp breaker. You will need to install a 20 amp double pole breaker. If it requires more than 20 amps you will have to replace the wiring and breaker.
A 15 amp breaker is not sufficient for a 225 amp load. You would need a breaker that matches the load current, such as a 225 amp breaker. Using a 15 amp breaker for a 225 amp load would cause the breaker to trip immediately due to overcurrent.
It is possible for a 12000 BTU air conditioner to run on a 15 amp breaker, but it may cause the breaker to trip if there are other appliances drawing power on the same circuit. It is recommended to have a dedicated circuit for the air conditioner to prevent overloading the breaker.
Yes, providing the phase is the same. but you can't do the other way around, or breaker will immediately pop, or fuse will blow.
If the appliance is just to be plugged into a circuit with multiple outlets then you just need to make sure that the sum of currents for all devices on the circuit are less than the rated current. A rule of thumb is total current should be no greater than 80% of the rated current. So you might have a 20 A breaker and several 2.5 A appliances on this circuit. If you have a dedicated circuit for the appliance you would only need to size the breaker for the maximum current being drawn by the appliance. If the appliance contained a motor then there might be a start-up current that might be as high as 15 amps so you would likely go to a 20 amp breaker for a safety margin. As a practical matter a dedicated circuit for an appliance in the 2.5 amp range should have a 15 amp breaker. I always install a 20 amp breaker just for added margin and possible future applications.
Replace the 30 Amp Breaker with a 15 Amp breaker.
If the 12,000 BTU A/C only requires 20 amps to run then yes you can use the same 12 gauge wire but you cannot change it to a 15 amp breaker. You will need to install a 20 amp double pole breaker. If it requires more than 20 amps you will have to replace the wiring and breaker.
A 15 amp breaker is not sufficient for a 225 amp load. You would need a breaker that matches the load current, such as a 225 amp breaker. Using a 15 amp breaker for a 225 amp load would cause the breaker to trip immediately due to overcurrent.
In North America the standard sizes for breakers are 15, 20, 30, and 40 amps. The 15 amp size breaker is used in general circuit wiring. The 20 amp size breaker is used for dedicated appliance receptacles, hot water tank and baseboard heating. The 30 amp size breaker is used for a clothes dryer. The 40 amp size breaker is used for the electric range.
It is possible for a 12000 BTU air conditioner to run on a 15 amp breaker, but it may cause the breaker to trip if there are other appliances drawing power on the same circuit. It is recommended to have a dedicated circuit for the air conditioner to prevent overloading the breaker.
A 15 amp receptacle is protected by a 15 amp breaker. The 15 amp breaker will trip on any current over 15 amps. So if the 20 amp machine draws a full 20 amps, then the answer is no. Due to some operations of machines they will not draw the full nameplate amperage until they reach a certain point in there cycling. The machine may run at the start but when it reaches that point it could trip the breaker. If the machine is not hardwired but plugged in, you could not run a 20 amp machine on a 15 amp receptacle, due to the different pin configurations on the plug cap.
Yes, the amp rating is a measurement of the highest amp load it should carry. So a 15 amp appliance will work on a 20 amp socket but you wouldn't want to use a 20 amp appliance on a 15 amp socket.
No, you should not replace a 15 amp breaker with a 20 amp breaker without consulting a licensed electrician. The breaker size should match the wire size to prevent overheating and potential fire hazards.
Yes, it will be protected by a circuit breaker or fuse. The normal rating of the circuit breaker or fuse is 25% more than the maximum current expected, or the maximum current allowed for the cable size, whichever is lower.
It's the amps that are controlled by the breaker not the volts. You can have a 600 volt 15 amp breaker, you can have a 347 volt 15 amp breaker. The breaker will trip when you exceed 15 AMPS.