hj
Master Plumber
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You can use the 20 amp space for the 30 amp breaker, but you need a new 10/3 w/grd and a NEW box because the existing one is too small for a 30 amp receptacle. In other words there is NOTHING about the 20 amp circuit which can be used for the dryer, and the "electrician", it that is what he really is, should have known that. I am also sure that the #12 wire was 12/2 and NOT 12/3 which the electrician should also have known.