What is a manhole called where both transmission and distribution ducts terminate?

A manhole where both transmission and distribution ducts terminate is referred to as a T and D manhole. This designation indicates that it functions as a junction point for both transmitting and distributing utilities, typically involving electrical, telecommunication, or other utility lines.

The significance of this term lies in its specific role in the utility infrastructure, where it serves to facilitate the organization, access, and maintenance of transmission and distribution systems. This particular manhole type allows for efficient management of utility lines, enabling easier access for repairs and monitoring.

Other terms such as distribution manhole, access manhole, and service manhole refer to specific functions or configurations of manholes, but none precisely convey the combination of transmission and distribution roles as the T and D manhole does. Therefore, the choice of T and D manhole appropriately highlights the dual function of the manhole in handling both aspects of utility infrastructure.