What term is used for an underground room intended for pulling and splicing cables?

The term used for an underground room intended for pulling and splicing cables is "manhole." Manholes are designed specifically for access to underground utility systems, including electrical and telecommunications infrastructure. These structures allow linemen and technicians to perform maintenance tasks like cable pulling and splicing in a safe and controlled environment.

Manholes are typically large enough for a worker to enter and provide the necessary space for handling cables and tools. Their design often includes features like covers for safety and protection against environmental elements. This is essential in maintaining the integrity of the cabling systems, ensuring reliable service for end-users.

Other options, while related to utility work, serve different purposes. For instance, a vault is usually a larger structure that can house transformers and other electrical equipment, while a trench is simply an excavation for laying down utilities. Chambers refer to enclosed spaces but do not specifically encapsulate the functionality of splicing and pulling cables as manholes do.