Each diesel engine (other than emergency engines) with a power output of more than 130 kW, installed in a ship built on or after 1 January 2000, and any existing engine of more than 130 kW that undergoes a major conversion on or after 1 January 2000, must have its own Engine International Air Pollution Prevention Certificate (EIAPPC) to certify its compliance with the NOx emission limits of the NOx Technical Code.