Which components are typically found in an underground distribution system?

An underground distribution system commonly includes cables, transformers, switches, and riser poles due to their characteristics and functions. Cables are essential for transmitting electrical power underground, ensuring safety and reliability while minimizing exposure to environmental factors. Transformers are integral in stepping down voltage levels for distribution to end-users, which is critical in densely populated areas where overhead lines would be impractical or aesthetically undesirable.

Switches are necessary within this system for controlling the distribution of power, allowing for the selective isolation of portions of the network for maintenance or fault management. Riser poles, while not part of the underground system per se, are important for transitioning from underground to overhead systems, providing a structured way to facilitate the connection and disconnection of various components.

Overall, this combination of components in answer B ensures the effective and efficient operation of an underground distribution network, which is critical for delivering electricity safely in urban and suburban environments.