The present disclosure relates to a signalling cable that includes: a cable core, a metallic screen surrounding and in direct contact with the cable core, and at least one flame retardant low smoke zero halogen polymeric sheath surrounding and in radially position with respect to the metallic screen. The cable core includes a plurality of insulated electric conductors and a core wrap. The insulated electric conductors each includes an electric conductor insulated by a fire barrier and a flame retardant low smoke zero halogen polymeric insulating layer.

A cable includes: a core wire; and an insulating outer layer covering the core wire; where in the core wire including an inner conductor, an inner insulating layer covering the inner conductor, and an outer insulating layer covering the inner insulating layer, the inner insulating layer being made of a material having dielectric constant and loss factor not higher than those of the material of the outer insulating layer, the outer insulating layer being made of a flame-retardant material.

Disclosed is an armored cable assembly including a core having a notched assembly tape about a plurality of conductors. A metal sheath surrounds the core.

The present disclosure provides insulated electrical conductors, e.g., wires, and methods for producing such insulated electrical conductors to combat partial discharge by enhancing bond strength between the electrical conductor and a base insulating thermoplastic layer (e.g., including a PAEK). Such insulated electrical conductors can include: an electrical conductor; an insulating coating on at least a portion of a surface of the electrical conductor; and an oxide layer between the electrical conductor and the insulating coating. Methods for producing such insulated electrical conductors can involve extrusion of an insulating polymer onto the electrical conductor under ambient atmosphere and a subsequent heat treatment step, which can also be conducted under ambient atmosphere.

A cable has an outer sheath made from fluoropolymer and a conductor core having several individual elements which are surrounded by an inner sheath which penetrates into an intermediate chamber between the individual elements. A heat resistant film is disposed between the inner sheath and the outer sheath and is formed of a metal layer and a support layer.

The present disclosure provides insulated electrical conductors, e.g., wires, and methods for producing such insulated electrical conductors to combat partial discharge by enhancing bond strength between the electrical conductor and a base insulating thermoplastic layer (e.g., including a PAEK). Such insulated electrical conductors can include: an electrical conductor; an insulating coating on at least a portion of a surface of the electrical conductor; and an oxide layer between the electrical conductor and the insulating coating. Methods for producing such insulated electrical conductors can involve extrusion of an insulating polymer onto the electrical conductor under ambient atmosphere and a subsequent heat treatment step, which can also be conducted under ambient atmosphere.

A technique facilitates construction and use of a power cable in a variety of environments, e.g. downhole environments. The power cable comprises a conductor, e.g. a plurality of conductors. Each conductor is surrounded by an insulation layer which is coated with a graphene-based ink. The graphene-based ink comprises graphene nanostructures and provides a flexible primary barrier coating for the power cable. The flexible primary barrier coating substantially increases fluid resistance of the insulation layer and also reduces transmission of downhole gases into the power cable insulation.

The present disclosure relates to a signalling cable that includes: a cable core, a metallic screen surrounding and in direct contact with the cable core, and at least one flame retardant low smoke zero halogen polymeric sheath surrounding and in radially position with respect to the metallic screen. The cable core includes a plurality of insulated electric conductors and a core wrap. The insulated electric conductors each includes an electric conductor insulated by a fire barrier and a flame retardant low smoke zero halogen polymeric insulating layer.

A cable has an outer sheath made from fluoropolymer and a conductor core having several individual elements which are surrounded by an inner sheath which penetrates into an intermediate chamber between the individual elements. A heat resistant film is disposed between the inner sheath and the outer sheath and is formed of a metal layer and a support layer.

Provided is a power cable that contains at least one insulated conductor extending along a cable longitudinal direction; a bedding layer surrounding the at least one insulated conductor, and a non-metallic armour surrounding the bedding layer. The non-metallic armour is made by at least one meshed tape helically wound onto the bedding layer and has an openness factor of at least 30% and a meshed tape tear resistance of at least 200 N according to DIN 53363 of 2003.