they are poor conductors
Electrical insulation on a wire or cable composed of plastic. Most wires and cables use plastic insulation. Some other types of insulation used on wires and cables are: enamel, cloth, natural rubber, gutta percha, ceramic, etc.
Electrical conductors
You are probably referring to moisture ingress. Moisture ingress into underground electrical cables, particularly high-voltage cables, can act to break down the insulating properties of that cable, and lead to a short circuit. Accordingly, underground cables incorporate a sheath (lead in older cables), which is impervious to moisture ingress, which surrounds the cable cores, and is located beneath the outer armouring. But moisture ingress can occur with all types of electrical equipment, and the manufacturers take steps to prevent this from happening.
Underground cables are 'armoured' in order to protect them against mechanical damage. This armour takes either of two forms: (1) steel tape, or (2) wire. Wire armour tends to be used on cables with a larger diameter, as it makes them more flexible compared to cables with tape armour. In both cases, the armour is spiral-wound towards the outer part of the cable along its length and is, itself, protected with a hessian or plastic outer layer.
In HVDC (High Voltage Direct Current) transmission systems, the primary types of cables used are underground cables and submarine cables. These cables are typically made from materials like cross-linked polyethylene (XLPE) or oil-filled cables, designed to withstand high voltage and environmental conditions. They are insulated to prevent electrical leakage and ensure safe transmission over long distances. Additionally, the use of bipolar cables allows for efficient transmission and improved reliability in the system.
they are a pieces of metal covered in plastic coating (for insulation) that deliver electricity to an electrical object e.g. TV act as a connection to the earth system of the appliance/house. They are also cables which are armoured for TV aerials etc
How do you remove electrical cables without damaging existing cables?"
Speaker cables are made of two electrical conductors usually made from copper. They are encased in a material like plastic or PVC usually to prevent damage.
Cables are two or more wires running side by side and bonded and there is armored and unarmored cable. Armored cables are protected by flexible steel covering while the unarmored cable is only covered by plastic.
Electric cables carry electrical energy in the form of electricity.
There are many different types of plastic. However, most types that are used in your daily life are, indeed, insulators.
aluminium is used for making electrical cables as the metal do not melt easily
because of heat cables expand
The purpose of a conductor shield in electrical cables is to protect the conductor from electromagnetic interference and to prevent leakage of electrical signals.
Household wires and electricity flexes are covered in plastic so that you do not touch the metal core by accident as it carries the electricity. But the overhead lines carried by pylons and in substations are not insulated at all as any way they are out of reach and insulating them adds up unnecessary costs. Pylons have ceramic or glass insulators to support the overhead lines so that electricity is kept away from the pylon itself.
Continuity of electrical cables must, because it is the process of inspection to found any discontinuity in the cable
we can use the electromagnetic waves to transmit the electrical powers without the cables. But it is very difficult.