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A 40 amp breaker is used in conjunction with AWG # 8 copper wire. The black and red wires are connected to the breaker. The ground wire is connected to the ground bar and the white wire is connected to the neutral bar.

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11y ago

A #8 copper conductor with an insulation factor from 75 to 90 degrees C is rated at 45 amps.

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AWG # 8 wire.

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12y ago

Number 8 awg

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Q: What size wire for a 40 amp breaker?
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Can you use 40 amp breaker for your lights and plug ins?

If you are referring to house wiring then the answer is no. A breaker protects the wire size that is connected to the breaker. In home wiring most homes are wired with a #14 wire which is rated at 15 amps. That is why the wire is protected by a 15 amp breaker. The correct wire size to connect to a 40 amp breaker is a #8. This size wire is too large to connect to receptacles an light fixture terminals.


What size wire for a 40 amp breaker to a welder?

A #8 aluminium wire with an insulation factor of 90 degrees C is rated at 45 amps.


What size wire for 75 feet of wire for a 30 amp 220 volt oven?

A 30 amp breaker run 75 feet would require you use AWG #10 wire. But, an oven normally pulls more that 30 amps and I would not use #10 wire on a 30 amp breaker for an oven. Normally any newer oven is wired with AWG #6 gauge wire on a 50 amp circuit breaker so the breaker will not trip during heavy use of the oven. Some older ovens could use a #8 wire on a 40 amp breaker.


Can you upgrade a 15 Amps circuit breaker for a 40 Amp for a 8.5 Watt shower?

Not unless you change the wiring for that circuit. The breaker protects the wiring and if you install a 40 amp breaker on a 15 amp wire circuit you will have a fire in your home.


What size wire do you use to install a 40 amp breaker for a 2amp pool pump?

I think you mean 2 HP pump. I am assuming a 220 To 240 volt supply and that should equate to about a 12 amp current. All my pumps use only a 30 amp breaker and 10 AWG wire.

Related questions

Can you use 40 amp breaker for your lights and plug ins?

If you are referring to house wiring then the answer is no. A breaker protects the wire size that is connected to the breaker. In home wiring most homes are wired with a #14 wire which is rated at 15 amps. That is why the wire is protected by a 15 amp breaker. The correct wire size to connect to a 40 amp breaker is a #8. This size wire is too large to connect to receptacles an light fixture terminals.


Is it ok to exchange a 20 amp breaker with a 40 amp breaker?

No, it is not okay to replace a 20 amp breaker with a 40 amp breaker. Breakers are designed to protect the electrical wiring in your home, and using a higher amp breaker can overload the circuit and create a fire hazard. Always use the correct amperage breaker for the circuit.


Can a 40 amp breaker not a 4 amp breaker be used to replace a 35 amp breaker for ac unit?

No, it is not recommended to replace a 35 amp breaker with a 40 amp breaker for an AC unit. Breakers are designed to protect the circuit and the equipment, so using a higher rated breaker can lead to overheating and potential damage. It is best to use the correct amperage rated breaker for the equipment.


What size wire and breaker do you need for a 5000 watt garage heater?

Look on the heater and see what amps it is pulling. That will determine the wire size and breaker size. It must be on a dedicated circuit. 15 amps = AWG # 14 wire with 15 amp breaker 20 amps = AWG # 12 wire with 20 amp breaker 30 amps = AWG # 10 wire with 30 amp breaker 40 amps = AWG # 8 wire with 40 amp breaker


What size wire for a 40 amp breaker to a welder?

A #8 aluminium wire with an insulation factor of 90 degrees C is rated at 45 amps.


Can you use 6-3 NM wire and 50 amp breakers and 50 amp range cord for a 40 amp max load range?

No, it is not advisable to use a 50 amp breaker with a 40 amp-rated appliance like a range. You should match the breaker size to the appliance requirements. In this case, you should use a 40 amp breaker, 8-3 NM wire, and a 40 amp range cord for the 40 amp max load range.


Will it hurt to use a 40 amp breaker on a water heater the wire I was sold will not fit into the 30 amp on a sq. D circuit breaker?

Using a higher amp breaker than recommended can create a safety hazard. It is not recommended to use a 40 amp breaker on a water heater that requires a 30 amp breaker. You should consult with a licensed electrician to properly address the wiring issue.


Can you use a 40 amp breaker to feed a sub panel?

It is not recommended to use a 40 amp breaker to feed a sub panel, as the breaker size should be based on the size of the wire and the load of the sub panel. It is important to follow the manufacturer's guidelines and local electrical codes when determining the appropriate breaker size for a sub panel.


What size wire for 75 feet of wire for a 30 amp 220 volt oven?

A 30 amp breaker run 75 feet would require you use AWG #10 wire. But, an oven normally pulls more that 30 amps and I would not use #10 wire on a 30 amp breaker for an oven. Normally any newer oven is wired with AWG #6 gauge wire on a 50 amp circuit breaker so the breaker will not trip during heavy use of the oven. Some older ovens could use a #8 wire on a 40 amp breaker.


Can you upgrade a 15 Amps circuit breaker for a 40 Amp for a 8.5 Watt shower?

Not unless you change the wiring for that circuit. The breaker protects the wiring and if you install a 40 amp breaker on a 15 amp wire circuit you will have a fire in your home.


Can you use a 40amp breaker on your 220v welder with 12-3 wire?

No, it is not safe to use a 40-amp breaker on a 220V welder with 12-3 wire. The wire size should match the breaker size to prevent overheating and potential fire hazards. In this case, a 30-amp breaker should be used with 12-3 wire for a 220V welder.


Could you use a 12gauge wire for a 25 amp breaker single pole?

No, a 12-gauge wire is typically rated for a 20 amp circuit. To safely handle a 25 amp breaker, you would need to use a 10-gauge wire. It's important to match the wire gauge to the amperage rating of the breaker to prevent overheating and potential fire hazards.