A housing system for an electrical connector, comprising: a chamber including a base wall and two substantially opposite and upstanding side walls (7, 9); and at least one cable clamping system, the at least one clamping system being arranged to selectively operate in first and second positions, the or each clamping system comprising first and second members (53, 59, 61) arranged to define an aperture or recess through which at least one cable can pass, the first member carrying a set of ratchet teeth and the second member having an engagement surface for engagement with the ratchet teeth, wherein in the first position the second member (59, 61) can be moved in relation to the first member so that the engagement surface can engage successive ones of the teeth in only one direction to reduce the size of the aperture or recess, and wherein in the second position the second member (59, 61) is permitted to move in the reverse direction to allow opening of the aperture or recess wherein the or each clamping system is insertable into the housing between the two side walls (7, 9) at which time the first and second members (53, 59, 61) are prevented from being moved apart by the side walls (7, 9); and the or each clamping system is removable from the chamber at which time said first and second members (53, 59, 61) can be moved apart; characterised in that the first member of the or each clamping system carries a set of ratchet teeth on opposite sides, and wherein a second member (59, 61) is provided on each side of the first member to define two cable recesses which in use can be reduced in size independently of one another. a chamber including a base wall and two substantially opposite and upstanding side walls (7, 9); and at least one cable clamping system, the at least one clamping system being arranged to selectively operate in first and second positions, the or each clamping system comprising first and second members (53, 59, 61) arranged to define an aperture or recess through which at least one cable can pass, the first member carrying a set of ratchet teeth and the second member having an engagement surface for engagement with the ratchet teeth, wherein in the first position the second member (59, 61) can be moved in relation to the first member so that the engagement surface can engage successive ones of the teeth in only one direction to reduce the size of the aperture or recess, and wherein in the second position the second member (59, 61) is permitted to move in the reverse direction to allow opening of the aperture or recess wherein the or each clamping system is insertable into the housing between the two side walls (7, 9) at which time the first and second members (53, 59, 61) are prevented from being moved apart by the side walls (7, 9); and the or each clamping system is removable from the chamber at which time said first and second members (53, 59, 61) can be moved apart; characterised in that the first member of the or each clamping system carries a set of ratchet teeth on opposite sides, and wherein a second member (59, 61) is provided on each side of the first member to define two cable recesses which in use can be reduced in size independently of one another.