It depends on what size wire you run to the Mobile Home...If you use wire rated at only 100 amps THEN THE BREAKER OUT AT THE FEED HAS TO BE 100 OR LESS BUT NOTTTTTTTTTT BIGGER. Since copper is high Id run only 100 amp wire to the MH and protect it with a 100 amp breaker instead of the old 200 well DUHHHHHHHH. If theres existing 200 amp wire to the MH and its protected by a 200 amp breaker that would work to feed an only 100 amp panel IFFFFFFFFF LUGS WILL ACCOMMODATE BIGGER WIRE?????
The breaker is sized such that it wont allow more current flow then the wires ampacity..
So YES a service of 200 amp wire if protected by a 200 amp or less breaker could still be used to feed a 100 amp panel BUT IF IT WERE ME ID STILL CHANGE THE BREAKER DOWN TO A 100 It wont hurt if the wire (if already there) is bigger to reduce voltage drop so long as the wire will fit into the panel. A 100 amp panel may or may not be designed for too much bigger feed input wires
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