generally size 500 MCM, but there can be factors which would require
up-sizing, such as high ambient temperature
long run causing excessive voltage drop
multiple circuits in same raceway
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A 600 MCM wire with an insulation factor of 75 and 90 degrees C is rated at 420 and 455 amps respectively.
Most 400 amp services will use parallel wires on each leg to feed the circuit.
A 3/0 wire with an insulation factor of 75 and 90 degrees C is rated at 200 and 210 amps respectively.
Depends upon whether you're using copper or aluminum or some other conductor and how far you need to run it and at how many volts and what voltage drop your load can tolerate during startup inrush.
A 500 MCM copper conductor with an insulation factor of 90 degrees C is rated at 430 amps.
For a 400 amp service, you would typically use 500 kcmil copper wire or 600 kcmil aluminum wire for the main service conductors. It's important to consult with a licensed electrician and check local electrical codes to ensure the correct wire size is used for your specific installation.
For a 400 amp service, it is recommended to use 3-inch conduit to allow for the appropriate wire size and future updates. This will provide enough space for the conductors to be pulled through without causing damage. It is important to verify the specific requirements with local building codes and regulations.
We recommend using a #6 copper wire for the connection between the breaker box and the earth ground rod. This size wire is commonly used for grounding purposes and is sufficient for carrying the electrical current safely to the ground rod. Be sure to consult with a qualified electrician to ensure the proper materials and installation for your specific situation.
Assuming you are working with 240v, you need 4/0 copper conductors.
A 400 watt heater can safely be used on a 15 amp circuit. The size breaker needed for a circuit is determined by the size of the wiring in that circuit. AWG #14 wire requires a 15 amp breaker. AWG # 12 wire requires a 20 amp breaker.