An enclosed connection system for mechanically and electrically connecting first and second cables each including an elongate electrical conductor (12A, 14A) covered by an insulation layer (12B, 14B), the enclosed connection system comprising: an electrical connector configured to form a connection with the first and second cables wherein the conductors (12A, 14A) of the first and second cables are electrically connected by the electrical connector; an enclosure configured to receive and cover the connection and to protect the electrical connector, the enclosure including a plurality of enclosure ports (EP1-EP4) each configured to receive a cable (12, 14); wherein: the enclosure includes first and second cover members (122, 124) defining first and second cover member cavities, respectively; the first and second cover members (122, 124) are pivotally connected by a hinge; the first and second cover members (122, 124) are relatively pivotable about the hinge between an open position to receive the connection and a closed position wherein the first and second cover members (122, 124) define an enclosure cavity to contain the connection such that the electrical connector is encapsulated in the first and second cover members (122, 124); characterised by a protective end cap configured to selectively cover at least a selected one of the enclosure ports (EP1-EP4); wherein the protective end cap includes an insert feature; the protective end cap includes opposed side walls (312, 314); the protective end cap is configured to be mounted on the enclosure such that: the insert feature is received through the selected enclosure port (EP1-EP4); and the opposed side walls (312, 314) overlap the first and second cover members (122, 124) and thereby resist displacement of the first and second cover members (122, 124) from the closed position toward the open position. an electrical connector configured to form a connection with the first and second cables wherein the conductors (12A, 14A) of the first and second cables are electrically connected by the electrical connector; an enclosure configured to receive and cover the connection and to protect the electrical connector, the enclosure including a plurality of enclosure ports (EP1-EP4) each configured to receive a cable (12, 14); wherein: the enclosure includes first and second cover members (122, 124) defining first and second cover member cavities, respectively; the first and second cover members (122, 124) are pivotally connected by a hinge; the first and second cover members (122, 124) are relatively pivotable about the hinge between an open position to receive the connection and a closed position wherein the first and second cover members (122, 124) define an enclosure cavity to contain the connection such that the electrical connector is encapsulated in the first and second cover members (122, 124); the enclosure includes first and second cover members (122, 124) defining first and second cover member cavities, respectively; the first and second cover members (122, 124) are pivotally connected by a hinge; the first and second cover members (122, 124) are relatively pivotable about the hinge between an open position to receive the connection and a closed position wherein the first and second cover members (122, 124) define an enclosure cavity to contain the connection such that the electrical connector is encapsulated in the first and second cover members (122, 124); the protective end cap includes an insert feature; the protective end cap includes opposed side walls (312, 314); the protective end cap is configured to be mounted on the enclosure such that: the insert feature is received through the selected enclosure port (EP1-EP4); and the opposed side walls (312, 314) overlap the first and second cover members (122, 124) and thereby resist displacement of the first and second cover members (122, 124) from the closed position toward the open position. the insert feature is received through the selected enclosure port (EP1-EP4); and the opposed side walls (312, 314) overlap the first and second cover members (122, 124) and thereby resist displacement of the first and second cover members (122, 124) from the closed position toward the open position.