The wiring ducts T1 and T1-F, with their particularly wide webs and slots, are particularly suitable for cables with larger diameters. Webs and side walls can be removed without burrs thanks to predetermined breaking points. The bars are spread slightly outwards to ensure a secure fit of the lid even under difficult conditions (vertical assembly, vibrations, transport). The T1-F wiring ducts have an additional retaining lug to prevent the wiring from slipping. Patented mounting points and a base perforation in accordance with DIN 43659 guarantee problem-free processing. Additional wiring duct covers (COV) are available upon request.