An integral, unitary pre-expanded cover assembly unit for covering an electrical connection between first and second electrical cables each having a primary conductor and a neutral conductor includes a cover assembly and a removable holdout. The cover assembly includes an elastomeric inner sleeve, an elastomeric outer sleeve, and a duct. The inner sleeve defines a cable passage to receive the electrical connection and the primary conductors of the first and second cables. The outer sleeve surrounds the inner sleeve. The duct is interposed radially between the inner and outer sleeves. The duct defines a duct passage configured to receive at least one of the neutral conductors therethrough. The holdout is mounted within the inner sleeve. The holdout is operative to temporarily maintain the inner sleeve in an expanded state and the outer sleeve in an expanded state. The duct is flexible. The duct is operative to resist radial collapse of the duct and to bend radially inwardly as the holdout is axially removed from the inner sleeve.

Power cable accessory assembly having: a power cable including: a conductor, and an electrical insulation layer arranged around the conductor, wherein the electrical insulation layer has a main section and an end section, the end section having a smaller diameter than the main section; a fastening device engaging with the electrical insulation layer in the end section, and a connector extending around the end section of the electrical insulation layer, the connector being mechanically connected to the conductor, wherein the connector has an inner surface provided with a structure that engages with the fastening device to maintain an axially fixed position between the connector and the electrical insulation layer.

Power cable accessory assembly having: a power cable including: a conductor, and an electrical insulation layer arranged around the conductor, wherein the electrical insulation layer has a main section and an end section, the end section having a smaller diameter than the main section; a fastening device engaging with the electrical insulation layer in the end section, and a connector extending around the end section of the electrical insulation layer, the connector being mechanically connected to the conductor, wherein the connector has an inner surface provided with a structure that engages with the fastening device to maintain an axially fixed position between the connector and the electrical insulation layer.