Building floor construction and underfloor wiring duct system

Claim 1

AN UNDERFLOOR WIRING DUCT SYSTEM FOR DISTRIBUTING ELECTRICAL SERVICE WIRES FROM A HOUSING, SAID UNDERFLOOR WIRING DUCT SYSTEM COMPRISING (A) A PLURALITY OF PARALLEL ELECTRICAL WIRING FEED DUCT RUNS OF DIFFERENT LENGTHS CONNECTED TO THE HOUSING AND EXTENDING DIFFERENT DISTANCES THEREFROM AT A FIRST LEVEL, (B) A CORRESPONDING PLURALITY OF GROUPS OF ELECTRICAL WIRING DISTRIBUTION DUCT RUNS EXTENDING TRANSVERSELY OF SAID FEED DUCT RUNS AT A SECOND LEVEL, EACH OF SAID DISTRIBUTION DUCT RUNS HAVING A PLURALITY OF ACCESS OPENINGS SPACED LONGITUDINALLY THEREALONG FOR DISTRIBUTING ELECTRICAL SERVICE WIRES TO FLOOR OUTLETS, ALL THE DISTRIBUTION DUCT RUNS OF ANY GROUP BEING SPACED FARTHER FROM THE HOUSING THAN THE DISTANCE ANY OF THE DISTRIBUTION DUCT RUNS OF A GROUP CLOSER TO THE HOUSING IS SPACED FROM THE HOUSING, EACH FEED DUCT RUN BEING CONNECTED TO EACH DISTRIBUTION DUCT RUN OF A RESPECTIVE ONE OF SAID GROUPS OF DISTRIBUTION DUCT RUNS, AND EACH FEED FUCT RUN BEING CONNECTED TO ONLY THOSE DISTRIBUTION DUCT RUNS OF ITS RESPECTIVE GROUP.