A cable includes a first copper conductor and a second copper conductor, and an insulation layer. The insulation layer is formed from a first polymer material, and is a single layer surrounding the first copper conductor and the second copper conductor. A discontinuity formed from a second polymer material is located within the insulation layer, between the first copper conductor and the second copper conductor. The discontinuity provides a weakness within the insulation layer. A jacket surrounds the insulation layer and is made of a third polymer material. A fiber optic ribbon may be located in the cable.

A power cable or a hybrid power-data cable includes power conductors and a plurality of continuity wires positioned radially outside of the power conductors. The continuity wires are positioned relative to the power conductors such that a cut in the cable will sever one of the plurality of continuity wires before a cut into the power conductors can occur.

A thermal management system for a power and fiber splice enclosure that includes a housing including electrical components is provided. The thermal management system includes a solar shield disposed external to the housing and covering at least a major portion of the housing. The thermal management system includes a vent disposed in the housing for venting hot air from the enclosure. The thermal management system includes a condenser thermally coupled to a heat conducting component of the enclosure for cooling at least the heat conducting component.

Disclosed is an opto-electric cable including one or more electrical conductors. Each conductor includes an electrically conductive core and an electrically insulating layer surrounding it. The cable also includes an optical unit embedded within one of the electrically conductive cores. The optical unit includes at least two optical fibers and a single buffer jointly surrounding all the optical fibers. Each optical fiber includes a core, a cladding and a coating. Since all the optical fibers of the optical unit are jointly surrounded—and protected—by a single buffer, an optical unit with a reduced size is obtained. This allows reducing the cross section of the electrical conductor in which the optical unit is arranged. In particular, electrical conductors with cross section lower than 10 mm.sup.2 are obtained.

An amplified optical link having a fault-protection capability that is based, at least in part, on the ability to selectively and independently power up and down different groups of optical amplifiers within the link. In an example embodiment, the optical link is implemented using an optical fiber cable having an electrical power line and arrays of optical amplifiers connected between successive optical fiber segments to form a plurality of disjoint groups of parallel optical paths between the ends of the optical fiber cable. The electrical power line is operable to selectively power, as a group, the optical amplifiers of at least some of the disjoint groups. In various embodiments, different optical paths can be implemented using different respective strands of a single-core optical fiber, different respective cores of a multi-core optical fiber, and/or different respective sets of spatial modes of a multimode optical fiber.

A power cable or a hybrid power-data cable includes power conductors and a plurality of continuity wires positioned radially outside of the power conductors. The continuity wires are positioned relative to the power conductors such that a cut in the cable will sever one of the plurality of continuity wires before a cut into the power conductors can occur.

A thermal management system for a power and fiber splice enclosure that includes a housing including electrical components is provided. The thermal management system includes a solar shield disposed external to the housing and covering at least a major portion of the housing. The thermal management system includes a vent disposed in the housing for venting hot air from the enclosure. The thermal management system includes a condenser thermally coupled to a heat conducting component of the enclosure for cooling at least the heat conducting component

In one embodiment the disclosure provides a portable and mountable apparatus and method capable of powering and deploying an illuminable tether to an unmanned robotic device (flying drone, ROV, terrestrial robot, to be referred to as a “URD”) that not only can provide power and command control to the robotic device, but also receive telemetry back from said robotic device's sensor(s) and data gathering instrumentation transferable to an operator's interface.

A cable includes a transmissive core; a jacket surrounding the transmissive core, which has at least an outermost polymeric layer; and an external semi-conductive layer around and in direct contact with the outermost polymeric layer of the jacket. The external semi-conductive layer is made of a composition comprising a base polymer material and an electrically conductive filler. The electrically conductive filler includes carbon nanotubes.

A power and communications cable may include an electromagnetic waveguide, an inner metallic tubular surrounding the electromagnetic waveguide, an electrically conductive material surrounding the inner metallic tubular, an electrically insulating material surrounding the electrically conductive material, and an outer metallic tubular resistant to corrosion and abrasion surrounding the electrically insulating layer. The example system may include an electrical device locatable in the wellbore and coupleable to the cable and a control unit coupleable to the cable and operable to supply power to and communicate with the electrical device via the power and communications cable.