Abstract: A conduit includes an elongate member with an outer surface and an inner surface defining an inner passage for enclosing one or more electrical signal conductors therein, and an electromagnetic shield disposed coaxially with the elongate member to block electromagnetic radiation emitted by the one or more electrical signal conductors.

Abstract: A conduit system comprises a plurality of elongate channels, each having three walls, one open side, and two open ends; a plurality of coupling devices, each adapted to be disposed between a pair of adjacent channels to couple their adjoining ends together to form a conduit with two open ends; a plurality of first covers, each adapted to be disposed over the open side of one or more channels and to be removably attached thereto by a locking device disposed within the respective channel and adapted to be operated only from within the channel; and at least one second cover adapted to be disposed over the open side of one or more channels and to be removably attached thereto by a locking device disposed within the respective channel and adapted to be remotely operated by an elongated member extending through one of the open ends of the conduit.

Abstract: A secure conduit system is described through which electrical, electronic or optical fiber cables, pneumatic tubing, hydraulic tubing or other elongated wiring, cabling or tubing can be routed. The system includes open-sided raceways through which the cable is routed, covers for closure of the raceways, at least one locking device to lock a raceway and cover and being releasable only from within the raceway, with the device release being accessible only though an open end of the conduit, and the remainder of the conduit sections being openable only after release of the locking device of the first section. The conduit system may be multibranched and is intended to be connected at its ends to secure enclosures which allow for controlled access to the cabling and to the release mechanism. Typical uses will be for computer networks, communication systems, equipment control systems and remote environmental gas sampling and analysis systems.