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When installing a ceiling box that may be used for a fan, and you install a spare switch leg to that box. Such as 14/3 or 12/3 NM cable, the box shall be listed for support of a fan.  This requirement only applies to single and multi-family dwellings.  The code panel recognized that home owners and/or renters sometimes change out the light fixture and put a fan in its place.  So this requirement will help when this activity is done in a single or multi-family dwelling unit.