What does a weatherhead prevent from entering the electrical conduit?

A weatherhead is an important component in electrical installations, specifically designed to protect outdoor electrical conduits that run from a utility pole to a building. Its primary function is to prevent water from entering the conduit. Water ingress can lead to electrical shorts, corrosion, or other hazardous conditions that can compromise the integrity and safety of the electrical system.

While it may help deter some dust, debris, air, and insects to a certain extent, these are not its main design considerations. The critical role of a weatherhead is to direct rainwater away from the opening of the conduit and ensure that it does not enter and cause electrical issues, making water the correct answer.