uploaded by Chris Dodds - Thorne & Derrick Sales & Marketing Manager
Thorne & Derrick are a leading distributor of Earthing & Lightning Protection Systems, including Marconite, the world’s premium electrically conductive aggregate material.
Marconite compound is used as a backfill to enhance the earthing effects of copper earthing rods – Marconite enables permanent, stable and low resistance earthing solutions even in difficult ground and soil conditions.
Pictured below T&D off-loading recent Marconite delivery of over 1000no 25kg bags – T&D can provide most competitive prices and delivery schedules for Marconite in the UK.
Thorne & Derrick are distributors of LV-HV Cable Installation, Cable Jointing & Electrical Equipment – we service UK and global businesses involved in cable installations, cable jointing, earthing, substation and electrical construction at LV, 11kV, 33kV and EHV.
T&D service utilities, power, construction, rail, mining, offshore, oil, gas and petrochemical industries. T&D distribute Electrical Safety Equipment protecting workers on underground cables, overhead powerlines, switchgear and substations at LV, MV and HV.
Contact T&D for Copper Earthing Tapes – Bare Tape & Covered
To complement Earthing & Lightning Protection products we stock and distribute the most extensive range of copper earthing equipment.
A series of How-To videos for repairing, jointing and terminating cables using 3M Cold Shrink & Scotchcast products.
uploaded by Chris Dodds - Thorne & Derrick Sales & Marketing Manager
This video by 3M Electrical shows how to apply 3M Mining Cable Splice Kits when repairing a damaged cable jacket or sheath.
3M Mining Cable Splice Kits 3100 Series may be used for flexible conduit and cable jacket repairs, as well as for cable splicing and jointing three conductor mine and portable cables, type 3M SHD-GC, MPF GC, and MPF.
The 3M video shows how to repair the damaged cable jacket by using 3M Mining Cable Splice Kits type 3100, 3103 and 3104.
3M Mining Cable Splice Kits 3100 Series
We hope you find this video informative and educational, contact T&D for technical support, quotations and stock availability for 3M Mining Cable Splice Kits .
Further details on the complete range of 3M Scotch Electrical Tapes can be found here:
➡ Visit 3M Electrical for further information about joints, terminations, tapes and insulation to seal, repair, splice and connect LV MV HV cables.
Cold Shrink | Joint | Terminate | Seal | Repair | Splice | LV MV HV Cables | 3M
uploaded by Chris Dodds - Thorne & Derrick Sales & Marketing Manager
Thorne & Derrick are distributors for Roxtec, the leading manufacturer of sealing solutions for cables and pipes, to protect electricity Transmission & Distribution assets including substations against water, gas and fire.
Roxtec H3 cable transit seals are ideal for the protection of cables and substations against constant running water entering Low, Medium & High Voltage Substations via concrete and brick foundations – the Roxtec H3 is a three-part cable transit seal that is easy to install including in wet conditions and in environments with running water; the system is suitable for normal and flood condition installation.
The cable transit withstands extreme cable bending and has a +5mm tolerance towards the aperture as well as an indicator showing when a compressed seal is achieved. The cable seal can be installed into sleeves, conduits and core drilled holes.
The Roxtec range of cable transits are resistant to constant and catastrophic water pressure and by providing firm cable retention with the cable seals forming a defence barrier against humidity and the risk of partial discharge – this ensures and maintains the optimum and uninterrupted service of substations reducing the risk of power outages.
The cable sealing system has been adopted by power utilities in the UK and overseas to seal 11kV/33kV cables – this includes both multiple single core cables in Trefoil and Triplex arrangement (BS7870) and 3 core polymeric insulated cables (XLPE & EPR including BS6622).
Below is a best practice installation guide for sealing substation cables with Roxtec H3 cable transit seals.
Installation In A Roxtec Knock-Out Sleeve
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| Remove the knock-out of the sleeve before inserting the seal. | The seal can be installed from the outside of the structure. | The seal can also be installed from the inside of the structure. | The seal must always be installed in the correct end of the knock out sleeve. |
Installation In A Core-Drilled Hole
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| Installation of seal into a core-drilled hole. Use a hole saw with the appropriate diameter. |
Installation In A Bolted Sleeve
For retrofit purposes an openable Roxtec sleeve can be used.
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| Use the flange as template for the drilling of the bolt holes. | Attach the frame to the structure using suitable sealing method and suitable stainless fasteners. |
Installation In A Welded Sleeve
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| Weld the Roxtec sleeve to the cabinet/wall |
Installation Of Cable Seals
Thorne & Derrick, working with Roxtec, can provide on-site installer training for all cable transit and sealing systems to ensure effective protection against flood damage or flammable gas migration on 132kV/66kV/33kV/11kV substations and battery rooms.
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| Measure the aperture according to the table below. | Remove any dirt from the sleeve/ hole. | Pull the pipes/cables through | Cables shall go straight through the seal. |
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| Make sure that the bolts of the seal are loose. | Adapt rubber layers to fit the cables. | Test with a cable. Achieve a gap of 0-1.0 mm between the rubber halves. Adapt the layers for all cables. The halves may not differ by more than one layer. | Lubricate the three parts of the seal all around. |
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| Insert the seal into the sleeve. Leave a 10 mm margin to simplify the installation of the last piece. | Press all three parts of the seal into the sleeve simultaneously. | If necessary, use a rubber hammer. | Tighten the screws crosswise one turn at a time. Start with the inner screws. |
Signs Of Compressed Seal
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| The seal is compressed when the rubber expands through the fittings and when the inner part bulges. | Sectional view of the seal showing when rubber expands and bulges. The required torque depends on several things, e.g cable or pipe size, amount of used lubricant, sleeve size or material in the cable sheath. | |
Disassembly Of Cable Seal
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| Release compression by untightening all the screws. | Use a suitable tool to remove the halves of the H3 seal. Be careful not to damage the seal. | ||
Reinstallation Of Cable Seal
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| Make sure that the inside surfaces of the exposed packing space are free from dirt or dust. | Adapt halves, which are to hold the additional cables or pipes, by peeling off layers until you reach the gap seen in pic. 3. The number of layers may not differ by more than one between the halves. | Achieve a gap of 0-1.0 mm between the rubber halves. If not, repeat 2. | Lubricate the inside surfaces all around with Roxtec Lubricant, especially into the corners. Continue reinstallation from step 7. |
➡ Note:
Roxtec UG Cable Transit Seals Product Range
| Roxtec Part Number | Aperture Ø (mm) |
Clearance Depth (mm) | Cable/pipe Range Ø (mm) |
| Roxtec H3 135 UG | 135-140 | 75 | 0+23-43 |
| Roxtec H3 150 UG | 150-155 | 75 | 0+24-52 |
| Roxtec H3 185 UG | 185-190 | 75 | 0+48-64 |
| Roxtec H3 200 UG | 200-205 | 75 | 0+48-68 |
Cable Transits – Roxtec
Established since 1985, T&D distribute the most extensive range of LV, MV & HV Cable Jointing, Terminating, Pulling & Installation Equipment – contact us today for a competitive quotation.
Key Products : MV Joints & Terminations, Cable Cleats, Duct Seals, Cable Transits, Underground Cable Protection, Jointing Tools, Feeder Pillars, Cable Duct, Earthing & Lightning Protection, Electrical Safety, Cable Glands, Arc Flash Clothing Protection & Fusegear.
Distributors for : 3M, Pfisterer CONNEX, Nexans Euromold, Elastimold, Catu, Roxtec, Emtelle, Centriforce, Lucy Zodion, Alroc, Hivotec, Cembre, Prysmian, Ellis Patents, ABB & Furse.
T&D Providers Of Jointer Training Courses By Pfisterer CONNEX & Nexans Euromold
The use of Cold Shrink applied cable accessories, including joints and terminations, has been adopted by UK and international power utilities for the connection, repair and upgrade of medium/high voltage power networks typically operating at 11kV, 33kV and 66kV.
Here, the cable jointer has used 3M Cold Shrink Cable Joints to effectively joint and connect the
3M Cold Shrink HV Joints Splicing 66kV XLPE Cable
Established since 1985, T&D distribute the most extensive range of LV, MV & HV Cable Jointing, Terminating, Pulling & Installation Equipment – contact us today for a competitive quotation.
Key Products : MV Joints & Terminations, Cable Cleats, Duct Seals, Cable Transits, Underground Cable Protection, Jointing Tools, Feeder Pillars, Cable Duct, Earthing & Lightning Protection, Electrical Safety, Cable Glands, Arc Flash Clothing Protection & Fusegear.
Distributors for : 3M, Pfisterer, Nexans Euromold, Elastimold, Catu, Roxtec, Emtelle, Centriforce, Lucy Zodion, Alroc, Hivotec, Cembre, Prysmian, Ellis Patents, ABB & Furse.
Thorne & Derrick are inviting you to join LinkedIn’s fastest growing Discussion Group : Low & High Voltage Power, Cabling, Jointing, & Hazardous Area Electricals (LV-HV).
Discussion subjects include cable installations, cable jointing, electrical substation, overhead line and electrical construction at LV, 11kV, 33kV and EHV.
Network, engage and promote your profile, company or products with over 10,000 influencers.
MRR Energy Services
Guest Post by Claire Carr - MRR Energy Services (Operations & Strategy Manager)
MRR Energy Services is a service provider to the Multi-Utilities, Transmission and Distribution, Oil & Gas and Renewable Industries providing HV Services with the addition of project manpower provision providing engineering, technical and construction professionals on a permanent, temporary and project basis – this includes trained and competent high voltage cable jointing teams for UK and international projects.
As a service provider to the Multi-Utilities, Transmission and Distribution, Oil & Gas and Renewable Industries MRR works closely with market leading contractors and companies focused on supplying global engineering and technical manpower solutions, including the delivery of High Voltage Electrical & Mechnical Services for Substation Installation & Maintenance up to 400kV.
MRR Energy Services are focused on providing niche technical, commercial, management and board level functions globally with extensive experience working across a wide range of industries and clients from PLC to start-up – this includes provision of high voltage cable jointers with current Jointer Training Competency Certification from market-leading manufacturers including Pfisterer Connex, Nexans Euromold and 3M Cold Shrink.
MRR Energy Services are ISO 9001:2015 UKAS accredited.
Site Professional Services
Turnkey Subcontract Works
Labour Supply & Fault Works
HV Services including Substation Installation & Maintenance
Working in partnership with Utility Engineering Solutions. Their design support services include:
Primary Contractor / System Operator Support
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LinkedIn Page https://www.linkedin.com/in/mrr-energy-services-107887178
LV ♦ MV ♦ HV
T&D distribute the most extensive range of LV, MV & HV Cable Jointing, Terminating, Pulling & Installation Equipment – we service UK and international clients working on underground cables, overhead lines, substations and electrical construction at LV, 11kV, 33kV and EHV transmission and distribution voltages.
LV – Low Voltage Cable Joints, Glands, Cleats, Lugs & Accessories (1000 Volts)
MV HV – Medium & High Voltage Cable Joints, Terminations & Connectors (11kV 33kV EHV)
Cable Laying – Underground Cable Covers, Ducting, Seals & Cable Pulling Equipment
T&D, CATU Electrical Safety & Arc Flash Protection Specialists for SAP’s, Linesmen, Jointers & Electrical Engineers – Largest UK Stockist
Thorne & Derrick invite you to join LinkedIn’s largest LV-HV Electrical Discussion Group : Low & High Voltage Power, Cabling, Jointing & Electricals. Discussion subjects include cable installations, cable jointing, substation, overhead line and electrical construction at LV, 11kV, 33kV and EHV. Network, engage and promote your profile, company or products with over 10,000 influencers.
Published 25 Mar 2026
klauke ekm60unv – universal cutting, crimping & punching tool The Klauke EKM 60 UNV is a versatile battery powered hydraulic universal tool engineered that can be used as a battery powered cable crimping tool and battery operated cable cutting tools that comes...
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INDUSTRIAL LABEL PRINTING SOLUTIONS When clear, durable and professional identification is required across control panels, cable systems, production facilities and industrial installations, print quality, reliability and ease of use are critical. Cembre industrial label printers are designed to support...
