Final answer:
Bus Tie Contactors (BTC) are devices used in electrical engineering to interconnect two separate networks or electrical systems.
Step-by-step explanation:
The Bus Tie Contactors (BTC) are devices used in electrical engineering to interconnect two separate networks or electrical systems. They are typically used to tie together utility and emergency power sources. The BTC will interconnect both networks when there is a disruption or failure in one network, allowing power to transfer from one network to the other.