Electrical cables and Wiring- as per electromagnetic pick up and radiation protection

Types of Electrical cable according to the protection from Electromagnetic pick up and radiation are Twisted Pair cable, Co-axial cable, Sheathed  cable. And according to materials used Copper cable, aluminum cable.

Details on Electrical cable types

Twisted Pair cable

Two conductors of a single circuit are twisted together for the purposes of canceling out Electromagnetic interference (EMI) from external sources.

Twisted pair’s susceptibility to electromagnetic interference greatly depends on the pair twisting schemes (usually patented by the manufacturers) staying intact during the installation. Thus, twisted pulling tension; bend radius is important term in twisted pair cable.

Coaxial Cable

Coaxial cable is a type of cable that has an inner conductor surrounded by a tubular insulating layer, surrounded by a tubular conducting shield. Many coaxial cables also have an insulating outer sheath or jacket. The term coaxial comes from the inner conductor and the outer shield sharing a geometric axis.

Coaxial design helps to further reduce low-frequency magnetic transmission and pickup. In this design the foil or mesh shield has a circular cross section and the inner conductor is exactly at its center. This causes the voltages induced by a magnetic field between the shield and the core conductor to consist of two nearly equal magnitudes, which cancel each other.

Copper cable

Electrical devices often contain copper conductors because of their multiple beneficial properties, including their high electrical conductivity, tensile strength, ductility, creep resistance, corrosion resistance, thermal conductivity, coefficient of thermal expansion, solder ability, resistance to electrical overloads, compatibility with electrical insulators, and ease of installation.

Aluminum cable

Aluminum conductor is cheaper and weigh less than copper but because of its greater resistivity, aluminum wiring requires larger conductors than copper.

Disadvantages- Cold flow tendency– tendency of a solid material to move slowly or deform permanently under the influence of stresses / pressure. Aluminium forms an insulating oxide layer on the surface.