Apparatus for secure routing of a signalling or transmission means which comprises: a first open-sided open-ended elongated channel member; a first cover for closure of an open side of said first elongated channel member; said first elongated channel member and said first cover in combination forming a hollow first conduit section; a second open-sided open-ended elongated channel member ((26, 26') a second cover (28, 28') for closure of an open side of said second elongated channel member; said second elongated channel member and said second cover in combination forming a hollow second conduit section; wherein said second hollow conduit section can be abutted to an end of said first hollow conduit section to form an elongated conduit through which said means is routed; said elongated conduit having an open longitudinal end; a locking mechanism attached to the first elongated channel member to lock said first cover to said first elongated channel member, characterized in that locking together of said first elongated channel member and said first cover also serves to lock together said second elongated channel member and said second cover, said locking mechanism comprising a locking rod provided inside said hollow first conduit section, and in that the apparatus further comprises a bracket (86, 241) attached to said first cover and extending into the hollow first conduit section, and wherein said locking rod is accessible through an open longitudinal end of said elongated conduit to be moved between a first position engaging said bracket thus locking said first cover and said second cover in place and a second position releasing said bracket thus releasing said first cover and said second cover, and wherein said apparatus further comprises a pull wire extending through an open longitudinal end of said elongated conduit for releasing said locking mechanism by actuating said locking rod; whereby said elongated conduit can be disassembled only by release of said locking mechanism by access through an open longitudinal end of said elongated conduit. a first open-sided open-ended elongated channel member; a first cover for closure of an open side of said first elongated channel member; said first elongated channel member and said first cover in combination forming a hollow first conduit section; a second open-sided open-ended elongated channel member ((26, 26') a second cover (28, 28') for closure of an open side of said second elongated channel member; said second elongated channel member and said second cover in combination forming a hollow second conduit section; wherein said second hollow conduit section can be abutted to an end of said first hollow conduit section to form an elongated conduit through which said means is routed; said elongated conduit having an open longitudinal end; a locking mechanism attached to the first elongated channel member to lock said first cover to said first elongated channel member, characterized in that locking together of said first elongated channel member and said first cover also serves to lock together said second elongated channel member and said second cover, said locking mechanism comprising a locking rod provided inside said hollow first conduit section, and in that the apparatus further comprises a bracket (86, 241) attached to said first cover and extending into the hollow first conduit section, and wherein said locking rod is accessible through an open longitudinal end of said elongated conduit to be moved between a first position engaging said bracket thus locking said first cover and said second cover in place and a second position releasing said bracket thus releasing said first cover and said second cover, and wherein said apparatus further comprises a pull wire extending through an open longitudinal end of said elongated conduit for releasing said locking mechanism by actuating said locking rod; whereby said elongated conduit can be disassembled only by release of said locking mechanism by access through an open longitudinal end of said elongated conduit.