Which of the following is NOT part of an underground power service?

Answer: D — Conduit riser with weatherhead

In the context of underground power services, a conduit riser with a weatherhead is typically part of the above-ground service entry where the underground wiring connects to overhead service. The weatherhead is specifically designed to protect the wires from moisture and debris when they exit the ground and transition to the overhead line. The other components—disconnect housing, power supply wires, and pull boxes—are integral parts of an underground power setup. Disconnect housing provides a safe method to disconnect power for maintenance, power supply wires are essential for transmitting electricity underground, and pull boxes are used to provide access to the wire for maintenance or changes. Because the conduit riser and weatherhead are associated with the transition to above-ground service, this choice does not belong to the components of an underground power service.