(chiefly British) Insulation
An insulating material; SYN. insulant, insulation.
1. The act of insulating for the purposes of protecting something.
2. The state of being insulated; SYN. insularity, insularism, detachment.
Process or material that prevents or reduces the flow of electricity, heat or sound from one place to another.
Electrical insulation makes use of materials such as rubber, pvc, and porcelain, which do not conduct electricity, to prevent a current from leaking from one conductor to another or down to the ground. Insulation is a vital safety measure that prevents electric currents from being conducted through people and causing electric shock.
Double insulation is a method of constructing electrical appliances that provides extra protection from electric shock, and renders the use of an earth wire unnecessary. In addition to the usual cable insulation, an appliance that meets the double insulation standard is totally enclosed in an insulating plastic body or structure so that there is no direct connection between any external metal parts and the internal electrical components. U thermal or heat insulation makes use of insulating materials such as fiberglass to reduce the loss of heat through the roof and walls of buildings. The U-value of a material is a measure of its ability to conduct heat—a material chosen as an insulator should therefore have a low U-value. Air trapped between the fibers of clothes acts as a thermal insulator, preventing loss of body warmth.