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) | Need to consider the existing network can provide a suitable earth for the new connection 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 up to 15m can be considered. Alternatively <=25m (35mm) Cable to be considered. |
| Distance to substation | <=500m |
| Service cable length | <=5m (4mm) or <=25m (25mm) |
| Transformer capacity | N/A |
| Mains extensions | Cable of metric size <185mm2 |
| 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) | Need to consider the existing network can provide a suitable earth for the new connection. A Full Network 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 G98/multiple connections or ENA G99 (previously ENA G83/multiple connections or ENA G59).
|
| Distance to substation | <=250m |
| Service cable length | <=25m |
| Transformer capacity | N/A |
| Mains extensions | Cable of metric size <185mm2 |
| 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) | Require a system check for all pole mounted transformers. Existing 5kVA pole mounted transformers will not provide sufficient capacity to cater for additional connections. Consideration to be undertaken to check that the volume of new connections does not exceed 75 customers on the feeder. Where this is the case alternative feed required as per ESDD-02-012.
Need to consider the existing network can provide a suitable earth for the new connection. A Full Network modelling analysis is required if: - The Distance from the Substation exceeds 250m;
- If the proposed new load includes starting currents in excess of 15A;
- Embedded generation enquiries above 16 Amps per phase (Generation subject to the requirements of ENA G98/multiple connections or ENA G99 (previously 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) |
| Mains extensions | Cable of metric size <185mm2 |
| 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 | Need a system check for all transformer types. Existing 5kVA pole mounted transformers will not provide sufficient capacity to cater for additional connections. Consideration to be undertaken to check that the volume of new connections does not exceed 75 customers on the feeder. Where this is the case alternative feed required as per ESDD-02-012
Need to consider the existing network can provide a suitable earth for the new connection. A Full Network modelling analysis is required if: - the maximum length of any Service Cable Exceeds 10m. Note no services to exceed 25m;
- 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 G98/multiple connections or ENA G99 (previously 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 |
| Mains extensions | Cable of metric size <185mm2 |
| 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.
|