Abstract: The invention provides a clamp and trolley system for moveably attaching a power cable, hose or tube (104) of a lifting apparatus to a guiding cable or track, the clamp 100) comprising: a first clamp component (102) having a first engagement surface (106,116) adapted to engage with the power cable, hose or tube (104); and a second clamp component (114) having a second engagement surface (132,133) adapted to engage with the power cable, hose or tube, the second clamp component (114) being pivotally attachable to the first clamp component and rigidly fastenable to it in a range of relative orientations; wherein the first and second engagement surfaces (106,116;132,233) are shaped so as to clamp the power cable, hose or tube (104) between the first (102) and second (114) clamp components as the second clamp component (124) is pivoted towards a more closed orientation.