Electric coupler

An electric coupler (1) for use in mines and quarries comprises a housing (14) with a metal head (2) at one end, at least two tubes (3) of electrically insulating material secured in the head, and an electric contact (4) positioned within each tube. An electric cable (6) passes through an opening at the other end of the housing and each conductor (5) of the cable is electrically connected to one of the contacts. Clamping means (10) positioned within the housing and electrically connected to the head, clamps the wire armouring (9) of the cable, voids (17) within the housing being filled with a hard-setting resinous insulating compound inserted through an aperture (18) in the housing after the coupler has been assembled, and which hardens to form a weatherproof coupler. The housing is formed from a material, such as pulpboard, cardboard, paper/plastics laminate or metal foil, which, when the insulating compound has hardened, contributes negligible mechanical support to the coupler.