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	Subject - bus drop cable zol_man quick question? at what intervals must bus drop be supported going through a commercial ceiling? thanks lctrc789 If you have a code book you can find all you need on bus ways in article 364-4. However busways must be supported every 5 feet unless it is marked differently. I don't know what size or type you have but being above a ceilng I would support it at least as per Manufactures recommendation. zol_man found it , had internet access easier than code book. bus drop cable supported within 6 feet of bus plug then every 8 feet horizontally