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What Are High-Voltage Insulators? High-voltage electrical insulators prevent electric current present in high voltage conductors from jumping to the ground. Insulators do this by impeding the movement of electrons which, by nature, seek a path to ground. They are found on high-voltage electrical line support structures as well as in electric power substations. Often called bells, they are composed of non-conductive materials. Insulators are in fact mechanical support structur
