A support bracket for mounting wires, cables, conduits and the like to floor beams of an aircraft passenger cabin floor without modification to the floor beams, the floor beams having a top flange, a bottom flange, and a vertical web. The support bracket has a support body with cable support cradles where each cradle has a cradling surface and a tie wrap passage; and at least clamping block connected to the support body with at least one adjustable tension bolt, the clamping block having a beam engaging surface wherein tension in the at least one bolt urges the beam engaging surface toward the support body.