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1/0 copper thhn covering. 3/0 aluminum again thhn covering

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AWG 1/0 gauge will suffice.

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

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The wire size in a meter stack is governed by the size of the first over current device.

#8 is the size of wire to use for grounding a 100 Amp panel. Green is color used for grounding #8 is code.

20Sqmm

Nec 310.16 #3 thhn

Assuming the voltage is 240 volts, the wire size for a 100 amp panel at the end of 400 feet and holding the voltage drop to 3 %, the wire will be 3/0 in size.

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AWG #3 wire

A #3 copper conductor with an insulation factor of 90 degrees C is rated at 115 amps. Even though the panel is rated at a higher amperage it is the main breaker that governs the wire size.

AWG #3

The wire size in a meter stack is governed by the size of the first over current device.

8 is the size of wire to use for grounding a 100 Amp panel. Green is color used for grounding8 is code.A #3 copper wire with an insulation rating of 75 or 90 degrees C is rated at 100 and 110 amps consecutively.

#8 is the size of wire to use for grounding a 100 Amp panel. Green is color used for grounding #8 is code.

20Sqmm

Nec 310.16 #3 thhn

Assuming the voltage is 240 volts, the wire size for a 100 amp panel at the end of 400 feet and holding the voltage drop to 3 %, the wire will be 3/0 in size.

Look at the value of the breaker or fuses that control your main electric panel. look at the wire size coming in to the main lugs on service panel, I am assuming you don't have a main breaker or you would look at the breaker rating to determine service size. 2/0 copper or 4/0 aluminum service size 200 amps, #4 copper or # 2 aluminum 100 amp.

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.

Yes, if you have the correct size #2 wire going to it.

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