Standard Design Matrix

Some Point of Connection designs can be determined using a Standard Design Matrix, shown below. This Matrix is also detailed within the process document ESDD-02-021, along with some guidance, and  can be found here.

Criteria	Measurement	Comment
Connection capacity	<=500W (unmetered suppliers)	4mm Service cable should only be used where service cut-out is within 5mtrs of the LV mains cable with the exception of road crossing where uo to 15 mtrs can be considered. Alternatively <=25m (25mm) Cable to be considered.
Distance to substation	<=500m
Service cable length	<=5m (4mm) or <=25m (25mm)
Transformer capacity	N/A
Asset types excluded	Cable of imperial size less than 0.1 square inch copper. Cable of metric size <95mm² Concentric cables look for cables marked as 2 core with imperial sizes, TCLC (SPM TRCC), (triple concentric lead covered), marked as ex dc (direct current) cables. Three core LV cables - 2 phase and neutral. Cables indicated as operating (Bunched) - check the various layers available on UMV for PILC LV cables marked as 3 Some cables we are unable to join live: Belgium cables and Consac. Interconnectors with no existing connected customers.

Criteria	Measurement	Comment
Connection capacity	<=6kW (non domestic only)	A full Nerwork modelling analysis is required if: The Distance from the Substation exceeds 250mtrs Embedded generation enquiries above 16 Amps per phase (Generation subject to the requirements of ENA G83/multiple connections or ENA G59)
Distance to substation	<=250m
Service cable length	<=25m
Transformer capacity	N/A
Asset types excluded	Cable of imperial size less than 0.1 square inch copper. Cable of metric size <95mm² Concentric cables look for cables marked as 2 core with imperial sizes, TCLC (SPM TRCC), (triple concentric lead covered), marked as ex dc (direct current) cables. Three core LV cables - 2 phase and neutral. Cables indicated as operating (Bunched) - check the various layers available on UMV for PILC LV cables marked as 3 Some cables we are unable to join live: Belgium cables and Consac. Interconnectors with no existing connected customers.

Criteria	Measurement	Comment
Connection capacity	Up to 4 Domestic (<=2kW ADMD each)	Existing 5kVA pole mounted transformers will not provide sufficient capacity to cater for additional connections. A Full Nerwork modelling analysis is required if: The Distance from the Substation exceeds 250mtrs Embedded generation enquiries above 16 Amps per phase (Generation subject to the requirements of ENA G83/multiple connections or ENA G59)
Distance to substation	<=250m
Service cable length	<=25m
Transformer capacity	N/A for ground mounted substation. System checks required for PTE (Pole Mounted Transformers)
Asset types excluded	Cable of imperial size less than 0.1 square inch copper. Cable of metric size <95mm² Concentric cables look for cables marked as 2 core with imperial sizes, TCLC (SPM TRCC), (triple concentric lead covered), marked as ex dc (direct current) cables. Three core LV cables - 2 phase and neutral. Cables indicated as operating (Bunched) - check the various layers available on UMV for PILC LV cables marked as 3 Some cables we are unable to join live: Belgium cables and Consac. Interconnectors with no existing connected customers.

Criteria	Measurement	Comment
Connection capacity	Single Connection <=69kW	Existing 5kVA pole mounted transformers will not provide sufficient capacity to cater for additional connections. A Full Network modelling analysis is required if: The maximum length of any service Cable exceeds 10mtrs. Note no services to exceed 25mtr There are 50 or more customers already on the LV feeder The assessed loading is 50% or greater than the existing capacity of the circuit. The proposed new load includes starting currents in excess of 15 Amps Embedded generation enquiries above 16 Amps per phase (Generation subject to the requirements of ENA G83/multiple connections or ENA G59)
Distance to substation	<=200m
Service cable length	<=10mtrs (No Study required), >10 <=25m (Study required)
Transformer capacity	System checks required for PTE (Pole Mounted Transformers) and ground mounted substations
Asset types excluded	Cable of imperial size less than 0.1 square inch copper. Cable of metric size <95mm² Concentric cables look for cables marked as 2 core with imperial sizes, TCLC (SPM TRCC), (triple concentric lead covered), marked as ex dc (direct current) cables. Three core LV cables - 2 phase and neutral. Cables indicated as operating (Bunched) - check the various layers available on UMV for PILC LV cables marked as 3 Some cables we are unable to join live: Belgium cables and Consac. Interconnectors with no existing connected customers.