Weatherhead

A weatherhead, also called a weathercap, service head, service entrance cap, or gooseneck (slang) is a weatherproof service drop entry point where overhead power or telephone wires enter a building, or where wires transition between overhead and underground cables.

At a building the wires enter a conduit, a protective metal pipe, and the weatherhead is a waterproof cap on the end of the conduit that allows the wires to enter without letting in water.

It is shaped like a hood, with the surface where the wires enter facing down at an angle of at least 45°, to shield it from precipitation.

Before they enter the weatherhead, a drip loop is left in the overhead wires, which permits rain water that collects on the wires to drip off before reaching the weatherhead.

They are also used on utility poles where overhead power lines enter a conduit to pass underground.