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It is one of a number of armoured electrical cables – which include 11 kV Cable and 33 kV Cable – and is found in underground systems, power networks and cable ducting. [1] Aluminium can also be used for armouring, and historically iron was used. Armouring is also applied to submarine communications cables.
A power cable is an electrical cable, an assembly of one or more electrical conductors, usually held together with an overall sheath. The assembly is used for transmission of electrical power. Power cables may be installed as permanent wiring within buildings, buried in the ground, run
Cross-section of direct buried cable. Direct-buried cable (DBC) is a kind of communications or transmissions electrical cable which is especially designed to be buried under the ground without any other cover, sheath, or duct to protect it. [1] Most direct-buried cable is built to specific tolerances to heat, moisture, conductivity, and soil ...
Buried plant consists of telecommunications equipment such as cables, splice closures, lower parts of pedestals, and grounding systems directly buried in the soil. Buried plant can be exposed to the same corrosive environment as underground plant. In addition, attack by gophers can expose underlying components to corrosion attack.
This usually means two distinct metal wires in the circuit, but in the earth-return circuit one of these is replaced by connections to earth (also called ground) to complete the circuit. Connection to earth is made by means of metal plates with a large surface area buried deeply in the ground. These plates could be made of copper or galvanised ...
Cables usually are secured with special fittings where they enter electrical apparatus; this may be a simple screw clamp for jacketed cables in a dry location, or a polymer-gasketed cable connector that mechanically engages the armour of an armoured cable and provides a water-resistant connection.
Modern fiber optic telephone cable has the advantage that it can be strung next to power lines without interference. In heavily populated regions of the UK, the only overhead cable that would be visible is the telephone line. Power cables and fiber-optic cables that deliver television and broadband services are buried underground.
Underground cables are more subject to damage by ground movement. The 2011 Christchurch earthquake in New Zealand caused damage to 360 kilometres (220 mi) of high voltage underground cables and subsequently cut power to large parts of Christchurch city, whereas only a few kilometres of overhead lines were damaged, largely due to pole ...