A cable clamp for securing an electrical cable to a support structure has two substantially similar half-shells, each half-shell including a concave inner surface terminating in a pair of abutting surfaces. The half-shells further include a pair of winged flanges offset a distance from the abutting surfaces. The lower half-shell can first be secured to a support structure using a pair of elongate members passing through the winged flanges of the lower half-shell and a plurality of fastening members. A cable can then be placed within a cable receiving region of the lower half-shell and the top half-shell can be secured to the lower half-shell, applying a clamping force to the cable without interference from the fastening members used to secure the lower half-shell to the support structure.