uploaded by Chris Dodds - Thorne & Derrick Sales Marketing Manager
Call T&D to discuss your requirements for PFISTERER CONNEX Size 4 Training – the Jointer Training Courses can be booked with Thorne & Derrick by calling 0191 4104292 (contact Martin Wigham) – successful attendees will become qualified up to 72.5kV for the installation of PFISTERER CONNEX Size 4 cable terminations.
Trainees will learn how to terminate cables and install Size 4 CONNEX inner cone cable terminations using modern high voltage cable preparation tools and utilising Alroc tools.
➡ 33kV Training: PFISTERER Courses – Jointer Training For MV CONNEX Connectors
Read our Blog ➡ PFISTERER CONNEX Training & Visit For Thorne & Derrick
Thorne & Derrick Stock & Supply PFISTERER CONNEX Connectors – call us for a quotation.
The Plug-in Connection System for Power Transformers and Gas-Insulated Switchgear
CONNEX is a high voltage pluggable cable termination system for all voltage levels up to 550kV – the Size 4 CONNEX Training Courses provide Competency to the Jointer to carry out the installation of PFISTERER CONNEX connectors up to 72.5kV (typically power and cable networks operating at 66kV).
Image Credit: Lee Roberts RLA Solutions Ltd.
T&D are Specialist Distributors to UK Distribution Network Operators (DNO’s), NERS Registered Service Providers, ICP’s and HV Jointing Contractors of an extensive range of LV, MV & HV Jointing, Earthing, Substation & Electrical Eqpt – this includes 11kV/33kV/66kV joints, terminations and connectors for both DNO and private network applications.
Pictured opposite: Recently the Thorne & Derrick team benefited from watching and learning from Jon Reed ((PFISTERER Cable Accessories Trainer) – with an amazing skill-set, Jon demonstrated mastery of “the semicon-screen cut“, the cable chamfer and overall cable preparation perfection when installing CONNEX connectors.
Contact us at Thorne & Derrick for all your HV Jointing Materials & Jointer Training Services required.Â
Cable Blowers | Cable Lubricant | Duct Rods | Cable Socks | Cable Jacks | Cable Rollers | Cable Protection Covers MV HV | Cable Joints MV HV | Duct Sealing
Contact our UK Power Team for competitive quotations, fast delivery from stock and technical support or training on all LV-HV products.
Tangent Delta Tests
Guest Article: IMCORP by Ben Lanz & Dr. Wayne Chatterton uploaded by Chris Dodds - Thorne & Derrick Sales & Marketing Manager
A utility client requested IMCORP to proactively assess their cables in a downtown area feeding a convention center. A nationally televised event was coming to town so naturally the reliability of the downtown power grid and avoiding an image-damaging power outage was of utmost importance.
The IMCORP Factory Grade® technology provided a meter-by-meter profile and pinpointed many issues with the cable systems feeding the convention center. The utility was surprised with how many components did not meet the cable and accessory manufacturers’ minimum performance standards. While the utility was greatly concerned and intended to make repairs prior to the upcoming event, they decided to get a second opinion with a different type of test called a VLF tan delta (tangent delta, TD) test.
Full article: âž¡Â Â Read more here………..
The Cable Experts |Â Medium & High Voltage Power Cable Systems
IMCORP is the technology leader in Medium & High Voltage Power Cable Systems life cycle condition assessment and performance – IMCORP have been helping their clients achieve maximum cable reliability for more than 20 years and have assessed over 130,000 5kV to 500kV cable systems spanning in excess of 160 million feet.
IMCORP Precision ReliabilityTMÂ approach integrates asset condition intelligence into optimized work management processes to maximize cable system reliability at the lowest possible life cycle cost.
Thorne & Derrick have curated this Twitter Moment to recognise the Global Cable Expert status of IMCORP – we are both honoured and humbled to be able to share our expertise and networks effectively to communicate our message to the broadest audience achievable.
Click the Tweet links for deeper reading.
Top 10 Tweets
MV HV Power Cable System Reliability Solutions by IMCORP
 💡 Read our Guest Blog with IMCORP ➡
The Semicon Screen – A Most Critical Point In Any MV Joint, Termination Or Connector
T&D are Specialist Distributors to UK Distribution Network Operators (DNO’s), NERS Registered Service Providers, ICP’s and HV Jointing Contractors of an extensive range of LV, MV & HV Jointing, Earthing, Substation & Electrical Eqpt – this includes 11kV/33kV/66kV cable joints, terminations and connectors for both DNO and private network applications.
Contact our UK Power Team for competitive quotations, fast delivery from stock and technical support or training on all LV-HV products.
All international sales enquiries can be serviced and supplied by our Export Power Team.
Key Product Categories: Duct Seals | Cable Cleats | Cable Glands | Electrical Safety | Arc Flash Protection | Cable Jointing Tools | Cable Pulling | Earthing | Feeder Pillars | Cable Joints LV | Joints & Terminations MV HVÂ
Did you know Cold Shrink, invented and developed by 3M Electrical in the 1970’s, provides:
* Data based upon U.S. failure data of U.S. manufactured 3M Cold Shrink Medium Voltage Cable Accessories between 2009 and 2012.
3M Cold Shrink Joints & Terminations
Joints & Terminations Stocked by T&D UK | Nexans Euromold | Pfisterer CONNEX
LV MV HV Jointing, Earthing, Substation & Electrical Eqpt
Exothermic Welding
uploaded by Chris Dodds - Thorne & Derrick Sales & Marketing Manager
The following table highlights 5 Benefits of using Exothermic Welding systems for Earthing & Lightning Protection when permanently joining copper conductors.
| Mechanical Connection | Exothermic Welding |
| Connection is made by pressing and tightening. Contact connection. | Connection is made by fusion – welding is more reliable and durable. Irreversible molecular bond. |
| Lower conductivity than the copper conductors involved. | Conductivity equal to or greater than the copper conductors involved. |
| Transient connection. Electrical degradation over time. | Permanent connection. Lifetime equal to that of the earthing system. |
| Suffers with the flow of current, faults or repetitive discharges. | Able to withstand repeated current flow without degrading. Minimum maintenance. |
| Connection depends on the tightening torque applied by the installer. | Once the exothermic welding mould is closed the process is autonomous, reproducible and uniform. |
Thorne & Derrick are working with AT3W to introduce and develop specifications and business for the Apliweld Secure+ exothermic welding system.
Jason Leatherland (UK Manager AT3W) comments, “having worked successfully together with Thorne & Derrick in the past, I was keen to demonstrate and discuss this product system with them as I knew they would be best suited to showcase the system, and in particular, its increased health and safety benefits, to the most relevant sectors in order to increase the users efficiency and reduce the potential of site accidents from exothermic welding.”
Jonny Hewitt (T&D UK Power Team) added, “working with the UK DNO’s and their preferred ICP’s we look forward to further developing relationships and presenting the exothermic welding system to existing and new clients. We will be working closely with AT3W to introduce the product to market and improve worker and site safety in the utility industry.”
Pictured: Jonny Hewitt (T&D) with Jason Leatherland and Chris Dodds (T&D).
💡 HV Earthing & Lightning Protection Training Courses go to ➡  Online Training Resource provided by Ian Griffiths, Principal Engineer at GreyMatters. Ian is an Earthing & Lightning Consultant of 27 years, one of the top 1% UKAS accredited CDEGS consultants and professional advisor to international utility companies, data centre and infrastructure developers. See our Blog to learn more about GreyMatters and High Voltage Earthing.
Thorne & Derrick are Specialist Distributors of leading manufacturers of Cable Accessories, Substation Earthing, Jointing & Installation Equipment.
LV MV HV cable accessories from stock used to joint, terminate, connect, cleat and gland power cables to air and gas insulated substations, transformers, switchgear and overhead line networks.
LV 600/1000VÂ â—Š MV 11kV 33kVÂ â—Š HV 66kV 132kVÂ
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Cable Abandonment | Pot End Cable End Seals | Energised or Dead Cables 11kV
Complete range of cable abandonment kits and live pot end sealing kits for : 11kV HV High Voltage Cables Single Core XLPE CWS.
Kits also available for: 11kV HV High Voltage Cables 3 Core XLPE EPR Cables.
For 600/100V power cable systems see Live Pot End Kits for LV power systems.
âž¡Â Joints | Terminations 11kV 33kV Heat Shrink
Installation Video: High Voltage Pot End Live Cable End SealsÂ
Published 15 Oct 2025
Testimonial Organiser | EA Technology Event | Industrial Forum 2025 Title | Keeping Electrical Switchgear Safe Date | 14th October Location | Chester Racecourse By | Chris Dodds (Sales & Marketing Manager at Thorne & Derrick | Co-Exhibitor with...
Published 18 Sep 2025
Thorne & Derrick International, the UK’s leading Specialist Distributor of LV HV Cable Accessories, Tooling & Hazardous Area Electrical Equipment, are celebrating 40 years of supplying products and solutions that ensure the safety and reliability of industrial heating, lighting...
