The feed-through insulator is for rigid conductors of medium or high voltage supplies. It is intended to minimise the generation of corona effects and their by-products in the area of about the point where the conductor passes through the wall. The wall through which the conductor passes has a hole several times the diameter of the conductor is held by a pair of conical folded bellows (1) made of some synthetic rubber material and is clamped to both the wall and the rod surfaces. A further corrugated layer enshrouds the length of the conduction within the two cones, the space between them being filled with a low dielectric constant elastic insulating material.
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