Selectivity table button will display manufacturer's selectivity tables if available. If there is no data provided by the manufacturer for the protective devices used on the selected circuit in regards to the selectivity, or a generic device is used, then, ElectricalOM will inform the user by means of a pop up window.



If the manufacturer data is available then ElectricalOM will display the Selectivity Table Preview window. Columns will correspond to the current rating of the upstream device where the rows correspond to the current rating of the downstream device. The cells of the selectivity table will have 3 different values:

  • T means total selectivity is achieved up to the breaking capacity of the downstream device, 
  • No means there is no selectivity between the upstream and downstream device, or
  • A number which represents a partial selectivity. The value is the maximum fault current in kA which selectivity is achieved. Any fault level above this value, selectivity is not achieved.



If two device is selected where a partial selectivity is achieved, then ElectrcialOM will display the actual breaking capacity of the downstream device and the max. fault current limit for partial selectivity. If the cell is highlighted in green, which means selectivity is achieved up to the breaking capacity of the downstream device, then the user may opt to use the modelled combination at the users own risk. If the cell is highlighted in red, which means the breaking capacity of the downstream device is higher than the max. fault current which selectivity is achieved, then the combination is not achieving any selectivity within required region and should not be used.




Icu of the protective device is also shown on Circuit Edit module's Protective Devices tab.



Single line diagram will dynamically change as the user selects different circuits and nodes on the system tree section.