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Breakdown of insulators refers to physical damage to the materials used to insulate electrical wires or other electrical equipment. Rubber or plastic can crumble away, it can be abraded, it can crack. No form of insulation is indestructible although some types of insulation are more durable than others. This is particularly a problem if you have wiring on the floor, and people step on it. Just as the soles of your shoes eventually wear away, so will insulation, if you are walking on it. But even without that kind of stress, rubber does tend to become more brittle with age.

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'Breakdown' describes the failure of insulation that occurs when the voltage applied across that insulation exceeds its dielectric strength. This results in the failure of that insulation, and the passage of current through it.

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