Multi-core cable, and disconnection detection device

A multicore cable, comprising:

• a plurality of coated electric wires;
• a detection wire;
• and
• a sheath, wherein
• the coated electric wires include
• an electric wire conductor and an electric wire coating, the electric wire conductor being a stranded wire of a plurality of electric wire filaments, and the electric wire coating covering an outer surface of the electric wire conductor,
• the detection wire includes
• a detection wire conductor that is a stranded wire of a plurality of detection wire filaments,
• the sheath covers an outer surface of a core that includes the coated electric wires and the detection wire,
• the coated electric wires include
• two electric power supply wires disposed adjacent to each other, and
• the detection wire is disposed in a region enclosed by:
• the two electric power supply wires disposed adjacent to each other and the sheath,
• wherein
• the core is formed by twisting the coated electric wires and the detection wire together, and
• in the core, the detection wire and a first electric power supply wire of the electric power supply wires are disposed so as to contact each other and are twisted together, the first electric power supply wire being connected to a ground potential.

A multicore cable, comprising:

• a plurality of coated electric wires;
• a detection wire;
• and
• a sheath,
• wherein
• the coated electric wires include
• an electric wire conductor and an electric wire coating, the electric wire conductor being a stranded wire of a plurality of electric wire filaments, and the electric wire coating covering an outer surface of the electric wire conductor, and
• two electric power supply wires disposed adjacent to each other, the detection wire includes
• a detection wire conductor that is a stranded wire of a plurality of detection wire filaments,
• the sheath covers an outer surface of a core including the coated electric wires and the detection wire,
• the detection wire is disposed in a region enclosed by the two electric power supply wires and the sheath,
• the detection wire is a coaxial cable including
• a detection wire coating covering an outer surface of the detection wire conductor, and
• a shield conductor covering an outer surface of the detection wire coating, and
• the detection wire conductor and the shield conductor are configured such that a characteristic impedance between the detection wire conductor and the shield conductor can be measured to detect a sign of disconnection of the coated electric wires,
• wherein
• the two electric power supply wires are each configured to include:
• a first stranded wire formed by twisting the electric wire filaments together, and
• a second stranded wire formed by twisting a plurality of first stranded wires together, and
• a pitch of twisting of the detection wire conductor is longer than a pitch of twisting of the first stranded wire.

A multicore cable, comprising:

• a plurality of coated electric wires;
• a detection wire;
• a sheath;
• a shield layer;
• and
• a drain wire,
• wherein
• the coated electric wires include
• an electric wire conductor and an electric wire coating, the electric wire conductor being a stranded wire of a plurality of electric wire filaments, and
• the electric wire coating covering an outer surface of the electric wire conductor, the detection wire includes
• a detection wire conductor that is a stranded wire of a plurality of detection wire filaments,
• the sheath covers an outer surface of a core that includes the coated electric wires and the detection wire,
• the coated electric wires include
• two electric power supply wires disposed adjacent to each other, and
• the detection wire is disposed in a region enclosed by the two electric power supply wires and the sheath,
• the shield layer covers an outer surface of the core and is disposed between the core and the sheath,
• the shield layer has a stacked structure including
• a substrate including an insulating material and disposed to face the core, and
• a conductive layer,
• the drain wire is in contact with the substrate and is electrically connected to a ground potential, and
• the shield layer functions as an outer detection layer configured to detect a sign of disconnection of at least one of the coated electric wires.