NEC 300.11(A)Secured in Place. Raceways, cable assemblies, boxes, cabinets, and fittings shall be securely fastened in place. - Jim Katen, Oregon I won't argue with that and I know that we're talking about dryers but, in my area, it's common to leave the range receptacle box loose so that it can be moved to accomodate various models and brands of ranges. Marc Common practice and code compliance are two different things. There are a lot of common practices which are not code compliant and not acceptable except to those that look the other way.