Cable duct for the automated wiring of an electrical control or switching system

A cable duct for the automated wiring of an electrical control or switching system, comprising:

• wherein the cable duct has a bottom for mounting on a base and two parallel side walls which are each formed by a plurality of tongues extending perpendicularly from the bottom, wherein adjacent tongues of the same side wall have between them a slot for the cable passage with a cable insertion aid which is arranged in an end position at a free end of the adjacent tongues facing away from the bottom, wherein the cable insertion aid in the end position opens in the direction of extension of the tongues from the free ends to the base into a tapering of the slot and preferably the tapering of the slot opens into a widening of the slot, wherein the slot has at least two further taperings along the length of the slot from the widening to the bottom, which have a passage cross-section with a different minimum opening width.