Porcelain Spool Insulators are used to insulate and support primary neutral and secondary (bare or covered) conductors at the pole or house using various clevis mounting configurations. Porcelain insulators are made from clay, quartz or alumina and feldspar, and are covered with a smooth glaze to shed water. Insulators made from porcelain rich in alumina are used where high mechanical strength is a criterion. These insulators have a dielectric strength of about 4–10 kV/mm. They did not receive the same level of interest as glass in the early years of insulator collecting, but have been gaining popularity in the last ten years. Here at Northern Power, we are here to help you with all of your insulator needs.
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