Which of the following may also be supported by the electrical service mast?

The electrical service mast is typically designed to support the electrical service entrance and related components such as weatherheads and service wires. The primary purpose of the mast is to ensure that these components are safely elevated above ground level and secured for protection against environmental factors.

In this context, none of the other options listed—telephone cables, satellite dishes, or clotheslines—are standard components that should be supported by an electrical service mast. Telephone cables are usually run alongside or attached to utility poles rather than being supported directly by the electrical service mast. Satellite dishes, on the other hand, require a stable structure designed specifically for their mounting to ensure proper alignment and support, which the service mast is not intended to provide. Lastly, clotheslines do not relate to electrical utility needs and are not designed to attach to a service mast, as they serve a completely different function unrelated to electrical service.

Thus, the electrical service mast is specifically intended for electrical service and not for the support of telecommunications or other non-electrical components.