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The purpose of a circuit breaker in a panel is to protect the wiring and devices like switches, outlets and other devices that are part of that circuit. It isn't unusual to plug in an appliance into a circuit whose amperage rating is less than the breaker protection. If such an appliance doesn't have its own over-current protection it may well "fry" in an over current situation. However, if your 40 Amp device is directly connect to the 70 A circuit and has no over-current protection on its own you are risking a serious problem. If your 40 A device is on this dedicated circuit you should protect it with a properly sized breaker.
What else can I help you with?
Can you run 8 gauge wire on a 50 amp breaker?
6ga should be used. It might not be against codes where you are,and you might have a 50amp installed for something that only uses 40amp, but it should be done right, and 6ga should be used off of a 50amp breaker.
What size breaker to use for a hand dryer its 120v 20amps?
For a 120V hand dryer with a rating of 20 amps, use a 20 amp breaker to match the device's ampacity and prevent potential overloading or overheating issues.
Can you use a 40amp breaker on your 220v welder with 12-3 wire?
NO! If you're running a 40 amp circuit you must use 8AWG wire. If you attempt to use anything smaller you run a significant risk of burning your house down. If you are unfamiliar with wiring regulations and practices, contact a qualified electrician to wire the circuit for you.
Can you use 2 20amp circuit breakers to protect to 40amp?
No, it is not safe to use two 20 amp circuit breakers to protect a 40 amp circuit. Circuit breakers are designed to protect the wiring in a circuit from overheating, and using a higher amperage circuit breaker than the wiring is rated for can lead to overheating and potential fire hazards. It is important to use the correct size circuit breaker for the amperage rating of the circuit.
Is a 40 amp circuit breaker ok for a 30 amp air conditioner?
No, it is not recommended to have a circuit breaker with a higher amperage rating than the device it is protecting. In this case, you should use a 30 amp circuit breaker for a 30 amp air conditioner to ensure proper protection from overcurrent.
Can you use a 60 amp breaker with a 50 amp overcurrent device?
A 50 amp breaker is an overcurent device.
What is a 30 amp circuit breaker used for?
A 30 amp circuit breaker is needed unless the load is a motor circuit, then it has to be sized to 250 percent of the motors full load amps. For 30A circuit is needed breaker 30*1.25=37.5 --> 40A. If load is lamp or heater, then use breaker of group A or B. If load is motor, then use breaker of groupC or D (very hard start) or special safe breaker for motor - with variable amp setpoint. See related link also. By code you are only allowed 80% of the rating of a breaker. So 30x80%=24amps. 24 amps is the MAX allowed on a 30 amp breaker. You would need a 40amp breaker for a 30 amp circuit. 40x80%=32. So you would want a double pole 40amp breaker.
What are the safety measures and procedures for using a circuit breaker lockout device?
When using a circuit breaker lockout device, follow these safety measures: Ensure the power is off before installing the lockout device. Use the correct size and type of lockout device for the circuit breaker. Secure the lockout device in place to prevent accidental removal. Only authorized personnel should have access to the lockout device key. Follow all manufacturer instructions for proper use. Remove the lockout device only after confirming the circuit is de-energized.
Can you run 8 gauge wire on a 50 amp breaker?
6ga should be used. It might not be against codes where you are,and you might have a 50amp installed for something that only uses 40amp, but it should be done right, and 6ga should be used off of a 50amp breaker.
What size breaker to use for a hand dryer its 120v 20amps?
For a 120V hand dryer with a rating of 20 amps, use a 20 amp breaker to match the device's ampacity and prevent potential overloading or overheating issues.
What do relay and circuit breakers use?
No. A relay is an electric switch and a circuit breaker is an overcurrent device.
What formula do you use to tell if you'll overload a breaker?
Use the Watts = Amps x Volts formula. Most appliances will have the wattage on the nameplate. Nameplates that have the amperage on them will be the size of the breaker that should protect that device. There is an exception for motor loads, breaker size is 250% of full load amps. Divide the watts by the voltage and you will get the amperage of the device. This amperage will govern the size of the breaker to use. Breakers start at 15A, then 20A,30A,and 40A for most branch circuits in a house.
How do you determine if a breaker switch is bad?
You replace the breaker to see if that fixes the problem. There simply is no other practical approach. There exists testing equipment that will do this but it is much too expensive for general use.
Can you use a 40amp breaker on your 220v welder with 12-3 wire?
NO! If you're running a 40 amp circuit you must use 8AWG wire. If you attempt to use anything smaller you run a significant risk of burning your house down. If you are unfamiliar with wiring regulations and practices, contact a qualified electrician to wire the circuit for you.
What is the advvantages if a circuit breaker?
You can reset a breaker. Fuses are a one time use device. Once they trip or burn out due to a short, they are no good anymore and you need to replace it with a new one.
Can you use 2 20amp circuit breakers to protect to 40amp?
No, it is not safe to use two 20 amp circuit breakers to protect a 40 amp circuit. Circuit breakers are designed to protect the wiring in a circuit from overheating, and using a higher amperage circuit breaker than the wiring is rated for can lead to overheating and potential fire hazards. It is important to use the correct size circuit breaker for the amperage rating of the circuit.
Is a 40 amp circuit breaker ok for a 30 amp air conditioner?
No, it is not recommended to have a circuit breaker with a higher amperage rating than the device it is protecting. In this case, you should use a 30 amp circuit breaker for a 30 amp air conditioner to ensure proper protection from overcurrent.
