What size wire do i need when moving 100 amp breaker box?

purchased duplex 2 breaker boxes in basement. need rewire house , keep renters out of basement , save money not having purchase wire putting box in each of units. need know size or kind of wire need power 100 amp box. thanks!

i purchased duplex 2 breaker boxes in basement. need rewire house , keep renters out of basement , save money not having purchase wire putting box in each of units. need know size or kind of wire need power 100...

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