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This is a voltage drop question. The sub panel's voltage needs to be stated to answer the distance part of the question. A #3 copper conductor with an insulation factor of 75 or 90 degree C is rated at 100 and 105 amps respectively.

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โˆ™ 2012-10-05 07:04:13
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Q: What size of wire is needed for a 100 amp sub panel 80 feet away from main panel?
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What size service cable for 100 amp main panel 100 feet away?

20Sqmm


What size wire is needed for 100 amp sub panel that is 250 feet away from main panel?

A 1/0 MCM copper conductor will limit the voltage drop to 3% or less when supplying 100 amps for 250 feet on a 240/120 volt system. This calculation is for a full 100 amps at the panel. If exact amperage is known the conductor size can be reduced to match the known amperage.


What size aluminum wire is needed for 100 amp sub panel 200 feet away from main panel?

Buried or conduit #2/0 aluminum will exceed the NEC recommended 3% or less and provide a 2.72% drop Increasing to 3/0 provides a 2.26% drop Make sure you resize your ground.


What is an Electrical Sub-panel?

An electrical sub panel is a smaller version of the main panel. It is a way to move many circuits to a point further away from the main panel instead of taking many single circuits from the main panel board. The sub panel has just one supply feed from the main panel. By using a sub panel there is a cost savings in labour and materials. On larger buildings there may be multiple number of sub panels. The amperage rating of the sub panel board governs the size of the wires and the breaker used in the main panel to feed it.


How many ground rods are needed for 100 amp sub panel?

It depends on where the sub panel is situated. If the panel is under the same roof as the main distribution panel then no ground rods are needed on the sub panel. If the sub panel is in a different building then a ground rod might be needed. There has been an electrical code rule change on this subject. Check with your local electrical inspector before installation so that it is done correctly.

Related questions

What size service cable for 100 amp main panel 100 feet away?

20Sqmm


What gauge wire to use for direct burial for a garage that is 400 feet from your house?

Depends on the size of the sub-panel in that garage. If you are installing a 60 amp sub-panel 400 feet away from the main service panel then use AWG # 4.


What size underground service entry cable needed for 100 amp sub panel 600 feet from main?

AWG 2/0 copper.


What size wire is needed for 100 amp sub panel that is 250 feet away from main panel?

A 1/0 MCM copper conductor will limit the voltage drop to 3% or less when supplying 100 amps for 250 feet on a 240/120 volt system. This calculation is for a full 100 amps at the panel. If exact amperage is known the conductor size can be reduced to match the known amperage.


What size aluminum wire is needed for 100 amp sub panel 200 feet away from main panel?

Buried or conduit #2/0 aluminum will exceed the NEC recommended 3% or less and provide a 2.72% drop Increasing to 3/0 provides a 2.26% drop Make sure you resize your ground.


What size wire is needed for 100 amp sub panel 200 feet away from main panel?

A #1 copper conductor is rated at 140 amps with an insulation rating factor of 90 degrees C at 240 volt single phase, will give you a full 100 amps at 200 feet. #4 wire should give you 95 amps. Anything over 200 feet you will start loosing more amps.


What size wire do you need for a 125 amp sub panel 30 feet away from a 150 amp main panel?

A 125 amp panel or subpanel requires # 2 gauge feeders and neutral. (# 2 awg is rated for 130A) However, depending on the existing load in your main 150A panel you likely don't have enough power to operate a 125 Amp subpanel.


What size copper wire do you need for a 50 amp sub panel 325 feet away from main panel?

Normally you would use AWG #6 but for this long run and voltage drop I would recommend you use AWG # 4.


What is an Electrical Sub-panel?

An electrical sub panel is a smaller version of the main panel. It is a way to move many circuits to a point further away from the main panel instead of taking many single circuits from the main panel board. The sub panel has just one supply feed from the main panel. By using a sub panel there is a cost savings in labour and materials. On larger buildings there may be multiple number of sub panels. The amperage rating of the sub panel board governs the size of the wires and the breaker used in the main panel to feed it.


How many ground rods are needed for 100 amp sub panel?

It depends on where the sub panel is situated. If the panel is under the same roof as the main distribution panel then no ground rods are needed on the sub panel. If the sub panel is in a different building then a ground rod might be needed. There has been an electrical code rule change on this subject. Check with your local electrical inspector before installation so that it is done correctly.


What are the required for electrical panel?

The main items required for an electrical panel include the panel box itself, fuses, and wiring. The wires are fed into the box and attached to a series of circuit breakers to allow electricity to be directed as needed.


Is the elctrical panel where electricity enters the home?

if it is the main panel outside yes, you could have a sub panel inside that come from the main panel

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