The additional kit is used together with a 1 kV joint kit SJK for jointing of belted paper insulated, aluminium sheathed 3 core cables. The kit is suitable for transition from belted paper insulated 3 core cable with Al sheath to 4 core plastic insulated cable. The kit includes three heat shrink tubes for protection of the paper insulation, a heat shrink breakout, a piece of H07V-K cable for jointing the aluminium sheaths.