A pivot stand structure for circular irrigation systems. A rigid frame mounts a water supply pipe having a vertically oriented end portion which receives a rotatable, readially outwardly extending water delivery pipe. The delivery pipe supplies water to remotely located irrigation heads which are mounted thereon and moved circumferentially by a plurality of electrically powered, motorized carriages. A rotatable conduit is coupled with the delivery pipe and extends through a vertical leg of the latter and out through an elbow in the water supply pipe. This conduit contains a plurality of electrical control conductors which are coupled with the electric drive motors. Mounted beneath the vertical end portion of the water supply pipe in axial alignment therewith is a slip ring housing. The slip ring housing mounts a plurality of slip rings which are adapted to be coupled with a source of electrical power. The control conductors are provided with wiping contacts at their terminal ends which establish electrical connection with the slip rings, so that electrical power is thereby delivered to the motors. By mounting the slip rings beneath the supply pipe a simpler installation is facilitated and the slip ring housing is easily accessible for service.