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

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Yes, as long as it has the necessary ampacity for the load and is properly fastened at each terminal. For example, we have a 4/0 aluminum cable feeding our 200 A subpanel 120 feet away.

1/0 copper

Exterior electrical service wires be at least 3 feet away from the sides, bottom, top, and front of all openable windows.

This is a voltage drop question. A voltage value needs to be stated. Assuming that the 200 amp panel is a single phase 120/240 volt sub panel. A #1 copper conductor will limit the voltage drop to 3% or less when supplying 100 amps for 200 feet on a 240 volt system.

Windows that can be opened.

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Yes, as long as it has the necessary ampacity for the load and is properly fastened at each terminal. For example, we have a 4/0 aluminum cable feeding our 200 A subpanel 120 feet away.

AWG 2/0 copper.

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.

Using Pythagoras' theorem it is 26 feet

For that distance I would run AWG # 3 copper and install a sub-panel.

1/0 copper

Exterior electrical service wires be at least 3 feet away from the sides, bottom, top, and front of all openable windows.

Windows that can be opened.

This is a voltage drop question. A voltage value needs to be stated. Assuming that the 200 amp panel is a single phase 120/240 volt sub panel. A #1 copper conductor will limit the voltage drop to 3% or less when supplying 100 amps for 200 feet on a 240 volt system.

AWG # 4

8 AWG copper is rated for 40 amps. Over 150 ft, at maximum current, the voltage drop would be about 3.76 volts. Using 6 AWG would have a voltage drop of 2.36 volts with the same 40 amps.

This is a voltage drop question. A voltage value needs to be stated. Assuming that the 100 amp panel is a single phase 120/240 volt sub panel. A #1 copper conductor will limit the voltage drop to 3% or less when supplying 100 amps for 200 feet on a 240 volt system.

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