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Standard Design Matrix

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.