An insulator is intented to isolate and insulate specific structural parts of an electric equipment operated at various voltage levels. The insulator allows for mechanical connection of parts on various voltage levels, without establishing a conductive bond between them.
Due to their properties the support insulators allow for safe construction of electric switchgear systems designed to withstand high mechanical stresses caused by short-circuit currents.
The body of a supporting insulator is made from epoxi resin which provideds for its heat, mechanical and electrical stability.
The embedded elements used to retain the screws are made from brass. The corresponding torque values are shown in Table 1.
Recommended torque values [Nm] of threaded elements embedded in epoxi resin, with standardized type of surface treatment.