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.
|