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

As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.

Before you do any work yourself,

on electrical circuits, equipment or appliances,

always use a test meter to ensure the circuit is, in fact, de-energized.

IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB

SAFELY AND COMPETENTLY

REFER THIS WORK TO QUALIFIED PROFESSIONALS.

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11y ago
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13y ago

Use 8 AWG wire for 40 amp service.

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Q: What size wire 40 amp?
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Related questions

What is the amp size of a 8 wire?

The amp size of a wire is determined by its gauge, not the number of wires. An 8-gauge wire is typically rated for around 40-60 amps, depending on the type and insulation of the wire.


What size wire for 40 amp?

AWG # 8 copper.


What wire size will carry a 40 amp load?

AWG # 8


What size wire in a 40 amp 12 volt circuit?

Use 8 gauge wire.


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 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.


How do you choose the right fuse for the job?

The correct size fuse needed is based on the size wire used in the circuit. The size wire needed is based on the load that will be applied to the circuit. 1. AWG 14/2 wire = 15 amp fuse 2. AWG 12/2 wire = 20 amp fuse 3. AWG 10/2 wire = 30 amp fuse 4. AWG 8/2 wire = 40 amp fuse


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 aluminum 600v wire work a 40 amp breaker?

Wire size is rated by Amperes of current. You did not mention the wire size of the aluminum wire, so there is no way to answer your question. The voltage rating is more a rating of how good the insulation around the wire is.


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.


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 do you need to run a 240V plug for a dryer?

the size of the wire that you need to run depends on the the amperage of the device/appliance you'll be hooking up to that line. Use #12 wire for 20 amp, #10 for 30 amp, #8 wire for 40 amps and #6 for 50 amps. Hope that helps.