Asbestos is mainly used as a covering for wires to protect against what?

Asbestos is primarily used as a covering for wires due to its excellent thermal insulation properties. It is highly resistant to heat, which makes it effective in protecting wires from heat-related damage. This is particularly important in electrical installations where high temperatures can cause insulation materials to degrade, potentially leading to electrical shorts or fire hazards.

While asbestos does have some resistance to moisture and provides a degree of fire resistance, its primary function in this context is to offer protection against heat. Electrical interference, while a consideration in wire insulation, is not a main concern addressed by asbestos.