you would use #2 aluminum urd wire for a 100 amp service
A 100 amp service requires that you use AWG 4 copper wire or AWG 2 aluminum wire.
A #3 copper wire with an insulation factor of 75 and 90 degrees C is rated at 100 and 105 amps respectively.
2 AWG Aluminum.
2 AWG Aluminum.
Service entrance wire size is AWG # 3 copper.
A 100 amp residential service requires a size #8 copper wire, it should be insulated in green.
100 amp
2 AWG in Aluminium is required.
The minimum size grounding conductor for a 100 amp service is a #8 bare copper wire.
I would recommend you use AWG # 2 copper or AWG # 1/0 aluminum for that distance and amperage.
Service wire for 100 amps requires AWG #3 copper.