Pset_InstallationOccurrence Properties defining installation information for occurrences of element, asset or system. IfcElement IfcAsset IfcSystem IfcElement,IfcAsset,IfcSystem InstallationDate Date on which the element is installed. AcceptanceDate Date on which the element is accepted by the manager or administrator. PutIntoOperationDate Date on which the element is put into operation.