Frank is correct, if you display at a public venue and your group carries insurance, you have to use UL approved devices in the way the manufacturer intends. We currently run the PH180 into the circuit breaker shack then to a TIU. This meets the requirement of as intended and manages to work for our application.
As far as at home I personally can't see cutting off a good plug. For less than $1 you can build a mating connector.
Steve
