R&D Cable Jointing Ltd is a specialist high voltage electrical engineering contractor based in Kent, delivering LV, 11kV and 33kV cable jointing, substation installation, testing & commissioning and SAP services across the UK. We work within the utility, ICP, renewables and private network sectors, bringing technical precision, reliable delivery and direct communication to every project we take on.
High voltage electrical engineering covers a broad range of disciplines, power generation, transmission, protection and control, substation design, switchgear, transformers and cable systems. Our specialism sits within the cable systems and substation installation part of that discipline, specifically the physical installation, jointing, testing and commissioning of HV cable infrastructure at 11kV and 33kV, and the associated substation fit-out works that connect that infrastructure to the wider network.
This is the work that sits between the civil contractor who installs the duct and cable routes, and the DNO or network operator who energises the completed connection. It requires engineers with specific HV cable jointing qualifications, DNO authorisations and practical experience of working safely on high voltage systems, not just a general electrical background.
Our engineers are qualified HV cable jointers, trained at Citrus Training to UKPN standards. We hold EUSR registration, are fully insured for public and employer's liability, and hold the authorisations required to work on DNO distribution networks under Distribution Safety Rules.
Cable jointing is the core of our technical capability. A correctly installed HV cable joint is the difference between a network that performs reliably for decades and one that fails prematurely under load. Our engineers understand that, and it shows in the way we approach preparation, build-up and quality control on every joint we make.
We work across all common HV cable types, XLPE, PILC and Waveform, at 11kV and 33kV, using cold shrink, heat shrink and push-on joint systems to manufacturer procedures. We carry the full range of joint kits for the cable types we encounter and will not start a job without the correct materials on site.
HV substation installation and fit-out is the other major element of our high voltage engineering work. A new ICP or IDNO connection, whether for a housing development, a commercial scheme, a renewable energy project or an EV charging hub, requires a substation to be installed and fitted out to the DNO's engineering standard before the connection can be energised.
We provide the full substation fit-out scope: HV cable landing and terminations, internal and external earthing systems, small power and lighting installation, CT wiring for COP3/5 metering boxes, LV STC panel installation and commissioning, and connection day management including taking control of the LV network on behalf of the IDNO at energisation.
High voltage work cannot proceed without a Senior Authorised Person in place to issue Permits to Work, manage isolations and ensure the system is safe to work on. We provide SAP services up to 33kV, in-house, which means our jointing teams and SAP are from the same contractor. This eliminates the coordination problems that arise when SAP and jointing are sourced separately and simplifies programme management significantly.
When a high voltage cable fails, whether from a third-party strike, joint failure or insulation breakdown, the repair requires engineers with exactly the same HV jointing capability as a planned installation. We provide HV fault response for 11kV and 33kV networks, attending once the fault has been located and access is confirmed, and carrying out the repair to get the circuit back in service as quickly as possible. R&D Cable Jointing does not carry out fault-finding or fault-location works, these are arranged separately with your own contractor.
Our high voltage engineering work spans a range of sectors, each with its own network types, client requirements and programme characteristics.
R&D Cable Jointing is a small, specialist contractor, founded by David Markides and Ricki Money with a combined 30+ years of industry experience. You deal directly with the people doing the work. We respond quickly, communicate honestly and take pride in the quality of what we install. We do not take shortcuts on preparation, we bring the right materials to site and we stay engaged until the job is properly complete.
If you have a HV electrical engineering scope, whether it is a single joint repair, a full ICP connection or a 33kV renewables installation, send us the details and we will give you a straightforward answer on what we can deliver and when.
Based in Kent, working nationwide. Our primary operating area covers Kent, Essex, London, Hertfordshire, Surrey, Suffolk, Cambridgeshire and Bedfordshire. We travel nationally for the right project. See our Areas We Cover page for full details.
With decades of combined experience, R&D Cable Jointing is trusted across the UK. Got a question not listed? Get in touch.
Send us the scope, cable type, voltage and location and we'll come back with availability and a clear plan. No lengthy process, just a straight answer.
Request a Quote Or call us: 0330 043 6689Send us the scope, cable type, voltage and location and we'll come back with availability and a clear plan. No lengthy process, just a straight answer.