The system couplers are typically installed within the generator main bus duct or ISO-phase bus duct. In some cases the EMC may be installed in the potential transformer (PT) cubicle Support if the system coupler is to be placed on a tap off of the main bus ensure the verification for installations involving taps has been satisfied. If there is no PT cubicle, then the system couplers can be fitted into the circuit breaker cubicle.