Five chairs fit along each long side at 24 inches apiece, 10 seats, the same count at 30 inches each with a chair at each end. Plan on about 18 by 12 feet with 48 inches between the table edge and the walls, so chairs pull out and people can walk behind them.
Each O-leg is an open loop of steel, 24 inches wide across the table, so it stands about 12 inches in from each long edge of the top. The steel is 1 inch thick and 2 and 1/2 inches deep with a silver powder-coat finish, and square steel spanning rods, about 1 inch across, tie the legs and the wire box together. The legs and the wire box are the only parts that stand on the floor, each on adjustable glides for leveling.
On this 10 foot conference table with open-frame legs, the legs are open steel and hide nothing, so the wire box is where the cords go. Each is laminate with a hinged door on both sides, so you can reach the plugs from either side of the table without crawling under it. That is the difference between a conference table with wire management and a top on legs.
Pick one to three power grommets on this page, set across or along the table, and they are cut into the top before it ships. Some grommet types also take a connection plate for network jacks, or for HDMI and VGA. Up to three matching credenzas can be picked here too and are built with the table.
