A cable spacer for use between pairs of subconductors in overhead power transmission lines comprising a pair of similar lever arms, each lever arm having two semi-circular section grooves with a resilient lining, one groove being provided at either end of the lever arm, a pivotal connection between the lever arms arranged such that relative pivotal movement of the lever arms causes the grooves at the ends adjacent to the pivot to come together and form a first circular aperture for engaging a first subconductor and the grooves at the other end to form a second circular aperture for a second subconductor, and a fixing means for locking the arms in engagement with a pair of subconductors.