A method for coupling ends of two insulated conductors, comprising: coupling an end portion of a core of a first insulated conductor to an end portion of a core of a second insulated conductor, wherein at least a part of the end portions of the cores (214A, 214B) are at least partially exposed; locating the exposed portions of the cores (214A, 214B) inside a box, wherein an end portion of a jacket of the first insulated conductor is located in a first conductor opening on a first side of the box and an end portion of a jacket of the second insulated conductor is located in a second conductor opening on a second side of the box; placing electrically insulating powder material into the box; providing a first plunger in a first plunger opening on a third side of the box; providing a second plunger in a second plunger opening of the box, the second plunger opening being on a fourth side of the box applying forces to the first plunger and the second plunger to compact the powder material, wherein the powder material is compacted into compacted powder material that at least partially surrounds a part of the exposed portions of the cores (214A, 214B); characterised in that the drive mechanism applying the force to the plunger is such that forces are applied to the first and second plunger to compact the powder material simultaneously from at least two directions and by forming the compacted powder material into a substantially cylindrical shape with an outside diameter relatively similar to an outside diameter of at least one of the insulated conductors (212A, 212B); and by placing a sleeve over the compacted powder material and coupling the sleeve to the jackets (218A, 218B) of the insulated conductors (212A, 212B). coupling an end portion of a core of a first insulated conductor to an end portion of a core of a second insulated conductor, wherein at least a part of the end portions of the cores (214A, 214B) are at least partially exposed; locating the exposed portions of the cores (214A, 214B) inside a box, wherein an end portion of a jacket of the first insulated conductor is located in a first conductor opening on a first side of the box and an end portion of a jacket of the second insulated conductor is located in a second conductor opening on a second side of the box; placing electrically insulating powder material into the box; providing a first plunger in a first plunger opening on a third side of the box; providing a second plunger in a second plunger opening of the box, the second plunger opening being on a fourth side of the box applying forces to the first plunger and the second plunger to compact the powder material, wherein the powder material is compacted into compacted powder material that at least partially surrounds a part of the exposed portions of the cores (214A, 214B); characterised in that the drive mechanism applying the force to the plunger is such that forces are applied to the first and second plunger to compact the powder material simultaneously from at least two directions and by forming the compacted powder material into a substantially cylindrical shape with an outside diameter relatively similar to an outside diameter of at least one of the insulated conductors (212A, 212B); and by placing a sleeve over the compacted powder material and coupling the sleeve to the jackets (218A, 218B) of the insulated conductors (212A, 212B).