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You will need a 100 amp tie-bar breaker for the main panel. Wire size will depend on wire rating 60C or 90C, copper or alum. how far is the new sub panel from the main, voltage drop is an issue as distance increases. I'm not a electrician but if I recall you will need 4-4 90C thhn copper wire for a 100 amp sub. panel.
Perrin
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