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HV Cable Jointing

LV-33kV cable jointing, terminations and substation services across the UK

R&D Cable Jointing delivers high-standard HV cable jointing for 11kV and 33kV networks across the UK. We support utilities, ICPs, IDNOs, civil contractors, renewables and infrastructure projects with clean workmanship, consistent delivery, and site-ready coordination.

Based in Kent and working nationwide, we regularly support projects across Essex, London, Kent, Hertfordshire, Surrey, Suffolk, Cambridgeshire and Bedfordshire.

  • 11kV and 33kV cable jointing, repairs and diversions
  • Transitional joints and straight joints
  • Indoor and outdoor HV cable terminations
  • Substation works including HV support tasks and coordination
  • Support for testing, commissioning, energisation and handover
  • Emergency and out-of-hours response available by agreement

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HV jointing services

We carry out HV cable jointing on 11kV and 33kV circuits, supporting both planned installation programmes and urgent repair works. Our work is delivered to manufacturer procedures and aligned to site requirements, permits, outages and programme constraints.

  • 11kV cable jointing for distribution networks, renewables and private networks
  • 33kV cable jointing for renewables, infrastructure and primary network connections
  • HV cable terminations into switchgear, transformers, RMUs and transition points
  • Fault repairs and reinstatement works with practical site coordination

Who we work with

We support technical and procurement-led teams who need a competent HV cable jointing contractor that turns up prepared, communicates clearly, and completes work to a high standard.

  • DNOs and utility contractors
  • ICPs and IDNOs
  • Civil and principal contractors
  • Renewables and infrastructure delivery teams
  • Industrial and commercial private networks

How we deliver HV cable jointing work

  1. Scope review with drawings, cable types, joint types, terminations, access and outage windows.
  2. RAMS and programme alignment to your site rules, permits and operational constraints.
  3. Controlled installation using manufacturer procedures and consistent workmanship.
  4. Inspection and handover with clear records, photos where required and sign-off support.
  5. Support through completion for testing, energisation support and defects close-out.

If you need a dependable HV jointing team that can integrate with your programme and deliver without drama, get in touch.

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Related HV services

Talk to an HV cable jointing contractor

If you need HV cable jointing for an 11kV or 33kV project, send over the scope and location and we will come back with availability and a straightforward plan.

  • Areas: Essex, London, Kent, Hertfordshire, Surrey, Suffolk, Cambridgeshire, Bedfordshire

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HV cable jointing FAQs

We’re based in the South East but provide services across the UK and are happy to travel further for larger projects. Just get in touch to discuss your location.

LV, 11kV & 33kV

PILC, XLPE, Waveform and other common LV/HV cable types. If you’re unsure, just ask – we’ve likely worked with it before.

Absolutely. We take care of everything from landing, earthing & fit-out to testing, commissioning, DNO audit attendance & taking control of the LV network on behalf of the iDNO on connection day.

A jointer physically installs and connects cables, while an SAP (Senior Authorised Person) is responsible for issuing permits and ensuring the system is safe to work on. We provide both services in-house.

We can do both. We’re happy to supply or work with your materials – whatever suits the job and your budget.

With 30+ years of combined experience, a trusted network and a commitment to quality, we deliver reliable solutions with a personal approach.

Simply email us at info@rdjointing.co.uk – We’ll get back to you and arrange a site visit or discuss your requirements.