Switch board

A switch board comprising a switch box with a casing thereof mounted on vertical supports erected on right and left sides, a conduction chamber and at least a pair of upper and lower electricity chambers with a partition wall having primary circuit breaker sections, said partition wall being located between said electricity chambers and said conduction chamber in said switch box, drawer-type electric devices thrown into and out of said electricity chamber, secondary control stationary plugs within said switch box adapted to connect and disconnect with a secondary movable plug each of said drawer-type electric devices, control lines connecting said secondary control stationary plug and control terminals mounted on said switch box, and wiring ducts containing said control lines;

• wherein said wiring ducts include control ducts having a control terminal arranged adjacent to the upper electricity chamber, an opening communicating with said vertical supports, vertical ducts communicating with said opening and located in said vertical supports, horizontal ducts connecting an end of said vertical ducts to said secondary control stationary plug of said lower electricity chamber and the other end of said vertical ducts to said secondary stationary plug of said lower electricity chamber.