A link box (10) for connecting electricity cables (13,14) is disclosed. The link box (10) comprises an inner enclosure (30), an outer enclosure which defines one or more cable-receiving spaces between the inner enclosure (30) and the outer enclosure, and at least one pair of connecting members (42). The connecting members (42) extend from the interior of the inner enclosure (30) into the cable-receiving spaces. Connection of the connecting members (42) within the inner enclosure (30) establishes electrical connection between electrical cables (13,14) connected, in use, to the connecting members (42) in the cable-receiving spaces. The exterior of the inner enclosure (30) is configured to interlock with insulating material (50) introduced, in use, into the cable-receiving spaces.