The invention relates to an arrangement for installing cables on outer surfaces of crane structures (1), the arrangement comprising means (9) for routing and fastening cables to said surfaces. These means consist of T profiles (9) fastened at the stem part (10) of the T profile to the outer surface (1) of the crane structure, the upper part (11) of the T profile on top of and transverse to the stem part of the T profile being at a distance from the surface of the crane and substantially parallel to this surface, whereby the T profile together with the surface of the crane provide cable conduits (12) for the cables, which are open from the sides.