Complete HV connection packages for developments above 500kVA. 11kV cable design, substation procurement, and all civil and jointing works under one contract.
Every HV connection follows a clear, auditable sequence. Here is exactly what happens at each stage.
HV connections are required when total demand exceeds the capacity of an LV extension from the NGED network. For most developments, this threshold is around 500 to 800kVA, though it depends on local network conditions. An 11kV supply is brought to an on-site substation, which steps voltage down to 400V LV for distribution around the site. USP carries out a load assessment and preliminary network capacity check to confirm whether HV is required before any formal application is made.
Once the HV connection route is confirmed, USP prepares the full substation design. This covers the choice of ground-mounted GRP enclosure or pole-mounted substation, ring main unit (RMU) specification for 11kV switching and supply security, and transformer sizing at 315kVA, 500kVA, or 1,000kVA depending on total demand. Designs are submitted to NGED for approval before procurement and installation proceed. USP manages all NGED design review queries.
With design approval confirmed, USP installs the 11kV XLPE cable connecting the NGED POC to the on-site substation. HV cable (185mm² or 300mm² depending on load) is installed in reinforced ducting at a minimum depth of 600 to 750mm in accordance with ESQCR 2002. All cable jointing is carried out by NGED-approved HV-qualified operatives. Marker tape, route cards, and as-built drawings are produced in NGED format for adoption.
After installation, the 11kV cable and substation are subject to post-installation testing including insulation resistance tests and pressure testing of cable joints. NGED carries out an adoption inspection before formally taking the HV cable and substation into their asset register. USP prepares all adoption documentation including as-built drawings, test records, material specifications, and welder qualification records. Once adopted, NGED is responsible for ongoing maintenance of the HV network.
Every HV connection and substation we deliver is NGED tested, adopted, and formally handed over. These are real USP projects, not stock photos.
The critical parameters that govern every HV electricity connection and substation installation.
Complete HV connection and substation capability from a single NERS-accredited provider.
Every HV connection we deliver meets the highest industry standards. Worker safety, public safety, environmental responsibility, and project compliance from planning to sign-off.
50 Google Reviews
I contacted USP and within minutes had a chat with Justin who described exactly how the job would be done and provided a comprehensive quote including labour and materials and was able to start the work in just 7 days. Justin and his team were brilliant and did an amazing job. I can highly recommend USP.
Jack and Joel were absolutely amazing this morning and really put themselves out to dig a hole without having to dig another hole in my drive. More work for them but one happy customer.
From the initial quote through to work completion, Justin and his work partner were a mix of professional, knowledgeable, good-humoured, and clear in all explained (I felt an instant ease to agree to the work). The work itself was excellent and they left the place immaculate!
George and Jack come out today to move a gas meter. It wasn't a straightforward job, but they both took time to talk me through what they were doing and what the next steps are. Very friendly and polite and thought about the needs of our family.
Jack and George are great.
Bang on time, completed the work perfectly, no issues. Left the meter really neatly finished. Jack and Joel were very courteous and did a great job.
George and Jack turned up and did a first class job, very friendly and professional. Great job lads.
Jack and Joel were brilliant. Very polite, worked to my highest expectations. Left the area as clean and tidy, as was possible. And explained every step of the process to me, answering any questions I had.
Fantastic work from Jack and Johl.
Tell us about your project and we will send you a free, no-obligation HV connection plan within 24 hours.
Prefer to talk? Call 024 7542 6505 for immediate service.