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#8 Wire for a 40 amp circuit...

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A three conductor#6 copper cable will limit the voltage drop to 3% or less when supplying 40 amps for 150 feet on a 240 volt system. Using a three wire you can put each 20 amp breaker on each "hot" wire and use a common neutral.

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11y ago
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9y ago

It depends on the supply voltage. That is because a lower voltage system would require a smaller voltage drop, therefore less wire resistance and a thicker wire.

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Q: What gauge wire neede to run 200 amp sub panel 210 feet from main?
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What size service cable for 100 amp main panel 100 feet away?

For a 100 amp main panel located 100 feet away, it is recommended to use a 2/0 copper or 4/0 aluminum service cable to ensure proper voltage drop and capacity for the distance. Consult with a licensed electrician to determine the specific requirements based on local codes and conditions.


What is the largest sub panel you can install off from a 60 amp main panel fed by 100 amp service?

You can install a 100 amp sub panel off a 60 amp main panel fed by 100 amp service. This allows for the sub panel to be adequately powered with headroom for future circuits or expansions. It is important to ensure the wire size from the main panel to the sub panel is sufficient to handle the load.


How do you wire a circuit panel?

This type of question usually means you aren't ready to do this yourself. Study some electrical material and the National Electrical Code and work this answer out for yourself. If I were to give you an answer, you might attempt to do something you shouldn't be doing, and that may cost someone a shock, a home fire, or their life.


Is a 6 gauge 4 conductor wire still used to install a 240V 50A hot tub more than 50 ft away from the panel?

Yes, a 6 gauge 4 conductor wire is suitable for installing a 240V 50A hot tub more than 50 ft away from the main panel. The heavier gauge wire is necessary to minimize voltage drop over longer distances and ensure the proper power supply for the hot tub. Be sure to follow local electrical codes and consult with a professional electrician for a safe installation.


What wire size for 100 amp sub panel 250 ft from main panel?

For a 100 amp sub panel located 250 ft from the main panel, you would typically need to use 3/0 aluminum wire or 2/0 copper wire to ensure efficient power transmission and voltage drop within acceptable limits. It is recommended to consult with a licensed electrician to ensure the appropriate wire size and materials are used for your specific setup.

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For a 100 amp main panel located 100 feet away, it is recommended to use a 2/0 copper or 4/0 aluminum service cable to ensure proper voltage drop and capacity for the distance. Consult with a licensed electrician to determine the specific requirements based on local codes and conditions.


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What wire size for 100 amp sub panel 250 ft from main panel?

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It is against code to install a main panel on a outside wall of a bathroom.