Skirting board duct lower part, 3 chambers, made of halogen-free plastic for SLH 20x80mm. Duct lower part for the electrical installation duct system skirting board duct made of halogen-free plastic in accordance with DIN EN 50085-1 as a device installation duct. Halogen-free plastic reduces the proportion of toxic components in the smoke gas in the event of a fire and does not develop any corrosive substances in combination with moisture, e.g. extinguishing water. This means that electronic devices and material assets are better protected. Lower part profile for direct wall mounting with pre-punched keyholes at a distance of 125 mm, 3 chambers for system separation of cables and for tool-free quick attachment of device carriers. The chamber structure of the lower part ensures the required floor clearance of at least 10 mm when accommodating insulated cables.