installation capacity "installation capacity" means the maximum level of electrical power which an installation can be used, worked or operated over a period of time without causing damage to any part of the installation; however, for a transmission or distribution system, it shall be the maximum level of electrical power, which the system is expected or required to supply over a period of time, whichever is the higher.". PU(A) 192/1998 - ELECTRICITY (AMENDMENT) REGULATIONS 1998 3. Amendment of Second Schedule.