What telephone wiring condition is characterized by one or more telephones not working because one or both conductors have been cut?

The condition where one or more telephones are not operational due to one or both conductors being cut is referred to as an open condition. In this scenario, an "open" in the circuit means that there is a break in the circuit path, preventing electrical current from flowing. Since telephones rely on a complete circuit to function, the disruption caused by a cut conductor leads to a failure of the device to operate.

This contrasts with other conditions mentioned in the choices. A short circuit involves a direct connection between two conductors, often resulting in excessive current flow and potential damage, but it does not specifically address the issue of open conductors. A ground fault refers to an unintended connection between a live conductor and the ground, which can create safety hazards but also does not apply to the situation of cut conductors. Conversely, a closed circuit indicates that the current has a complete path to flow, which would not relate to telephones that are not working due to cut conductors. Thus, the open condition accurately describes the situation of inoperative telephones caused by breaks in the wiring.