A strain insulator is an electrical insulator designed to work in mechanical tension or strain to withstand the pull of a suspended electrical wire or cable. Strain insulators provide support to transmission lines, radio antennas, and other types of electrical wiring. They are used between two wires to electrically separate them from one another, or where a wire attaches to a pole or tower to transmit the pull of the wire to the support while keeping it electrically insulated.

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