👉 The term "estrums" is a technical term in electrical engineering that refers to a specific type of conductor used for high-voltage transmission. It consists of an insulating material coated with a conductive layer, and it typically has a diameter greater than 1/2 inch (0.5 cm) or more than 3/4 inch (7.5 cm). This conductor is used in conjunction with other components to transmit electrical power between different locations.