The range of Heat Shrinkable Products manufactured by Nexans have been in service on LV & MV Cables and Networks for over 20 years and are approved by the following international electric power utilities:
Thorne & Derrick, Specialist Distributors of MV HV Power Cable Products, welcome the opportunity to tender and submit competitive prices for UK and international projects requiring LV MV HV Joints, Terminations & Connectors manufactured by Nexans – this includes the Euromold brand of screened separable connectors.
Nexans Euromold | Joints | Terminations | Connectors
Thorne & Derrick distribute the most extensive range of MV HVÂ Cable Jointing, Terminating, Pulling & Installation Equipment – we service UK and international clients working on underground cables, overhead lines, substations and electrical construction at 11kV and up to 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
A60 Sealing
uploaded by - Chris Dodds Thorne & Derrick Sales & Marketing Manager
Sealing Cables & Pipes Offshore
A flexible pipe penetration sealing system, using NOFIRNO, for single or multiple metallic and GRP pipe applications, providing fire protection in A60 to H120 and uninsulated A0 and H0 bulkheads and decks. The NOFIRNO sealing system will reduce vibration, stress and cathodic corrosion and is age tested to prove 50 years of cable and pipe sealing protection.
NOFIRNO is also proven to provide a blast rating and fire protection during a 2 hour jet fire test and will ensure watertight integrity even after exposure to a 1 hour (A60) fire.
NOFIRNO Flexible Pipe Sealing System is one of the most adaptive systems for sealing straight and angled pipe penetrations and can even accommodate multiple pipe runs. The system is 
designed to maintain the safety of vessels providing fire protection and ensuring bulkheads and decks remain gas and watertight when pipes need to pass through them. It consists of only two components: NOFIRNO sealant; a silicone based fire resistant, water repellent sealant and NOFIRNO multi-filler sleeves, supplied in bonded strips to make the system easy to install.
NOFIRNO – A Brand of CSD Sealing Systems | Distributed by Thorne & Derrick
The NOFIRNO system from CSD Sealing Systems is tested against fire resistance to both A (A60) and H (H120) Classification – the temperature regime in the furnace during an A-Class fire is similar to that of a cellulose fire and during an H-Class fire similar to that of an oil fire. In a H-Class fire the increase in temperature is much faster than that of an A-Class fire. The cable penetration must be tested both Vertically and Horizontally in order to be approved for general usage by the leading certifying authorities.
Fire Protection Integrity
The integrity of the cable penetration must be maintained throughout the test period (A60 A-Class 60 Minutes, H120 H-Class 120 Minutes) – the occurrence of flaming on the unexposed face or ignition of a cotton wool pad applied to any gap or fissure that appears in the test specimen constitutes a loss of integrity.
Insulation
The limit of temperature increase on the non fire side of the penetration is stipulated in EN 1366-3 or IMO A754(18). The maximum acceptable temperature increase at any point on the penetration during the test is 180 °C. An approved fire test gives the penetration a classification where the fire is specified (A-H-Class Fire) and the time for which the penetration was able to resist the fire in respect of the maximum allowed temperature increase on the non fire side of the penetration (180°C).
For example, a penetration that withstands an H-Class fire for 120 minutes is classed as H120 and a penetration that withstands an A-Class fire for 60 minutes is classed A60.
Fire Classes
If the 180 °C temperature increase is not exceeded during the stipulated time the penetration is approved and can be classified.
* A0 and H0 relates to no temperature restriction on the non-fire side. H0-400 °C relates to a restriction of 400°C maximum temperature increase on the non-fire side. A0-H0 and H0-400 °C must also meet the division integrity requirements, not allowing cracks or opening to develop through which flames or hot gasses can pass.
| Class | Fire Test Requirements Attained | |
| Integrity (minutes) | Insulation (minutes) | |
| A0 | 60 | 0* |
| A15 | 60 | 15 |
| A30 | 60 | 30 |
| A60 | 60 | 60 |
| H0 | 120 | 0* |
| H0-400 C | 120 | 120* |
| H60 | 120 | 60 |
| H120 | 120 | 120 |
| JET | ||
| J15 | 60 | 15 |
| J30 | 60 | 30 |
| J45 | 60 | 45 |
| J60 | 60 | 60 |
NOFIRNO is for A0 – A60, H0 – H120, Jet Fire, Blast, Watertight & Gastight ratings:
• Simplified design through standardisation of all bulkhead penetrations and a significant reduction in components
• Allows design changes without the need for additional hotwork
• Space reduction
• Faster installation
• Allows for misalignment of pipe work due to build tolerances
• Significant reduction in number of pipe spools
• Vibration stress and cathodic corrosion reduced increasing the life of pipe systems and reducing the failure rate
• Easy replacement of pipe systems
• Vibration & noise reduction – reducing noise signature
• Significant weight saving over bulkhead fittings making more energy efficient
Jet Fire Testing
âž¡ NOFIRNO – Jet Fire Testing For Cable Duct & Pipe Penetration Sealing Systems
• Certified for use in A60 boundaries (A60 – min length 180mm), tested & approved without any insulation for A0 applications, (A0 – min length 250mm)
• Proven watertight even after A60 fire test
• 2 hour hydrocarbon fire test – both with and without insulation, rated H0 and H120
• 2 hour Jet Fire test – with no additional insulation
• Shock tested to 850g to DEF STAN 08-120 including post test pressure test to 6.9 bar
• Blast rated sealing system
• Low Smoke and Toxicity – DEF STAN 02-711 and DEF STAN 02-713
NOFIRNO is for A0 – A60, H0 – H120, Jet Fire, Blast, Watertight & Gastight Ratings. INSTALLATION GUIDE.
Some further benefits of the sealing system include:
• Ensuring ATEX, DSEAR & WIMES compliance
• Age tested to prove 50 years of sealing protection
• Quick and easy to install in both horizontal and vertical cable ducts
• Easy re-entry for adding, removing or replacing cables LV MV HV
• Installed in any sized or shaped opening, penetration or duct
• Resistant to submersion in petrol and diesel
• Resistant to methane, hydrogen sulphide and chlorine
• Suitable for trefoil and large diameter 11kV/33kV power cables
• Prevents rat and rodent ingress into low, medium and high voltage substations
➡ Read More: NOFIRNO – Sealing Systems Explosive Environment Sealing Systems For Hazardous Areas (ATEX Directive) Sealing Systems
âž¡ Contact Thorne & Derrick to discuss the NOFIRNO Duct Seal System – 0191 4104292.
Watertight & Gastight Sealing For Building Entries & Cable Duct Terminations
A simple and long term solution designed for sealing cable ducts and building entries against ingress of water, gas or flooding – the NOFIRNOÂ system is used extensively across the utilities and construction sectors to protect LV MV HV electrical substations, equipment rooms and cabinets, wind turbines and critical infrastructure.
Some site installation photographs of NOFIRNOÂ âž¡Â
THORNE & DERRICK are international distributors of LV, MV & HV Offshore & Marine Cable Installation, Jointing, Substation, Earthing & Electrical Equipment – we supply Joints, Glands, Cleats & Cable Accessories specified for use in harsh and hazardous areas to support the installation of marine and offshore power cables.
Since 1985, T&D have established an international reputation based on SERVICE | INTEGRITY | TRUST.
DNV is a rigorous approval system for cable accessories including joints, glands and cleats – the DNV approval process assesses all of the evidence offered by the manufacturer and compares it to the requirements of the international standard, IEC61914. Once full compliance is proven DNV Type Approval is offered.
DNV Approved
Hydrocarbon Resistant | Zero Halogen & Fire Resistant
Hazardous Area Explosion Proof | Zero Halogen
Zero Halogen | Fire Resistant | Stainless Steel
Also âž¡ Cable Labels, Cable Ties, Cable Transits and Cold Shrink
Contact Thorne & Derrick for further information and customer service – extensive range of DNV Approved Marine & Offshore Cables & Cable Accessories available for delivery to UK and international projects.
LV MV HV – 3.3kV 6.6kV 11kV 33kV
T&D ⇒ CABLE ♦ JOINT ♦ TERMINATE ♦ CONNECT ♦ GLAND ♦ CLEAT ♦ CRIMP ♦ DUCT ♦ SEAL ♦ REPAIRÂ
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 MV, HV, 11kV, 33kV and EHV. Network, engage and promote your profile, company or products with over 10,000 influencers.
NOFIRNO – A Brand of CSD Sealing Systems | Distributed by Thorne & Derrick
uploaded by Chris Dodds - Thorne & Derrick Sales & Marketing Manager
Sealing systems for cables and pipes are used in a diverse range of industry sectors including hazardous area locations and potentially explosive atmosphere applications in the onshore and offshore oil and gas industries. ATEX Directive requirements can be imposed for specific uses in hazardous area environments where there is a risk of explosion.
Kiwa has thus investigated the extent to which the NOFIRNO sealing system fulfils ATEX Directive 2014/34/EU –Â Kiwa is an autonomous global organisation in Testing, Inspection and Certification (TIC), Training and Consultancy services.
What is ATEX?
ATEXÂ is the name given to the two European Directives for controlling explosive atmospheres in designated hazardous area locations:
1) Directive 99/92/EC (also known as ‘ATEX 137’ or the ‘ATEX Workplace Directive’) on minimum requirements for improving the health and safety protection of workers potentially at risk from explosive atmospheres.
2) Directive 94/9/EC (also known as ‘ATEX 95’ or ‘the ATEX Equipment Directive’) on the approximation of the laws of Members States concerning equipment and protective systems intended for use in potentially explosive atmospheres.
The NOFIRNO systems is comprised of rubber and filler sleeves and sealant, the system is used to treat transit openings for cables and pipes in walls, floors, bulkheads or decks, so that they are fire-resistant and sealed against gas, smoke and water.
Kiwa’s research has shown that NOFIRNO, from CSD Sealing Systems, is extremely suitable for use in environments such as those covered by the ATEX Directive and described in the European standard EN 1127-1 ‘Explosive Atmospheres – Explosion Prevention & Protection – Part 1: Basic Concepts & Methodology’.
Because the NOFIRNO sealant, NOFIRNO rubber sleeves and the complete NOFIRNO sealing system do not fulfil an autonomous role and are not equipment in the sense of the ATEX Directive, the risk evaluation focused on use of the NOFIRNO in cable and pipe transits. All possible ignition sources related to the sealing system were also investigated.
Among the possible ignition sources which were assessed, were hot surfaces, flames and hot gases (including hot particles), mechanically-generated sparks, electrical equipment and power leakages, cathodic corrosion protection, static electricity, lightning, electromagnetic and ionising radiation, ultrasonic sound waves, adiabatic compression and shockwaves and exothermic reactions, including materials self-igniting.
How? A 20mm thick layer of NOFIRNO sealant is applied to each side of the conduit – clean and dry the conduit opening and pipe thoroughly to remove all dirt, rust or oil residue to ensure excellent adhesion of the NOFIRNO to the conduit. The conduit should be overfilled with NOFIRNO sealant as some sealant will be pushed between and into the empty filler sleeves during finishing and completion of the pipe or cable seal.
Conclusion
Safe Cable & Pipe Sealing Solution For Hazardous Area & Explosive Atmospheres
Kiwa concluded that for all hazardous situations as described in EN 1127-1, there is no ignition source for NOFIRNO sealant, NOFIRNO rubber sleeves, NOFIRNO rubber filling sleeves and the complete, installed NOFIRNO system.
NOFIRNO is manufactured by Beele Engineering.
Contact us for duct sealing systems for onshore and offshore sealing of medium/high voltage (MV-HV) substation cables.
Some benefits of the sealing system include:
• Ensuring ATEX, DSEAR & WIMES compliance
• Age tested to prove 50 years of sealing protection
• Quick and easy to install in both horizontal and vertical cable ducts
• Easy re-entry for adding, removing or replacing cables LV MV HV
• Installed in any sized or shaped opening, penetration or duct
• Resistant to submersion in petrol and diesel
• Resistant to methane, hydrogen sulphide and chlorine
• Suitable for trefoil and large diameter 11kV/33kV power cables
• Prevents rat and rodent ingress into low, medium and high voltage substations
NOFIRNO cable duct and pipe penetration sealing system is jet-fire tested for offshore applications.
âž¡ Contact Thorne & Derrick to discuss the NOFIRNO Duct Seal System – 0191 4104292.
Watertight & Gastight Sealing For Building Entries & Cable Duct Terminations
A simple and long term solution designed for sealing cable ducts and building entries against ingress of water, gas or flooding – the NOFIRNOÂ system is used extensively across the onshore utilities and construction sectors to protect LV MV HV electrical substations, equipment rooms and cabinets, wind turbines and critical infrastructure.
âž¡ For marine and offshore applications see:Â A60 H120 Pipework Fire Protection For Offshore Bulkheads & Decks
Jet Fire Testing
âž¡ NOFIRNO – Jet Fire Testing For Cable Duct & Pipe Penetration Sealing Systems
Some site installation photographs of NOFIRNOÂ âž¡Â
LV ♦ MV ♦ HV
Thorne & Derrick 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.
UKPN LV MV HV 11kV 33kV | Tile Tape | Stokbord Covers
uploaded by Chris Dodds - Thorne & Derrick Sales & Marketing Manager
UK Power Networks, UKPN, are a UK Distribution Network Operator distributing low and high voltage electricity covering South East England, the East of England and London –  we overview current UKPN recommendations and specifications for Cable Protection Tapes & Covers using Tile Tape and Stokbord cable protection products.
Note these are subject to change: check with Thorne & Derrick Sales.
This should assist LV-HV Cable Jointing, Installation & Civil Engineering Contractors installing the appropriate level of LV-HV Cable Protection for underground power cables.
T&D are Approved Vendors to UKPN and their contractors providing competitive prices and technical support for LV, MV & HV Cable Installation, Jointing, Substation & Electrical Equipment including low voltage electrical distribution feeder pillars manufactured by Lucy Zodion from the Fortress range.
All cables and cable ducts shall be protected by a cable protection tape or a Stokbord, the tape used depends upon the highest cable voltage to be protected:
Cable protection tape or covers shall be installed so that they fully cover the width of the cable or cable duct installed below them.
Summary: The ECS 02-0019 Standard details the minimum requirements acceptable for the installation of new LV, 11kV, 20kV, 33kV, 66kV and 132kV cables plus associated pilot and telephone cables.
âž¡ View our complete range of LV-HV Cable Protection.
T&D supply Utilities & Approved Contractors with cable pulling products including cable rollers, cable socks and drum lifting jacks to enable the installation of low voltage and high voltage cables intro trench or duct: this includes single core, 3 core and Triplex 11kV/33kV power cables and LV waveform, mains and service cables.
Conduit & Duct Rods | Cable Lubricants | Cable Swivel Links | Cable Duct Bellmouths | Cable Cleaning & Cleaners | Jointers Tents | Cable Blowers
uploaded by Chris Dodds - Thorne & Derrick Sales & Marketing Manager
Heat Shrink Wraparounds
During an annual inspection of the High Voltage Cable (Transmission & Distribution) Network at a power grid located in Thailand the following cable damage was witnessed to the high voltage underground cable sheath, note the “cracking” effect to the jacket.
Installed in 1996 and originally manufactured by Phelps Dodge the 66kV/115kV high voltage distribution cable was of single core construction with XLPE insulation, lead sheath (Alloy E) and compact copper conductor with 800sqmm cross section area – the cable specification and project record book noted a nominal overall diameter of the complete cables at 113mm.
The client was concerned about the potential threat of water ingress seeping into the inner cable construction and causing electrical fault breakdown overtime.
Under consideration to reinstate the cable sheath damage was a wraparound heat shrink cable repair system –Â the cable repair sleeve consists of a raised rail profile with interlocking stainless steel channel and thick wall adhesive lined heat shrink tube to wraparound the section of damaged cable to reinstate the electrical insulation to the CABLE sheath/jacket. The “wraparound solution” could be used if the underlying layers of the cable construction had not been damaged. The “wraparound” would be provide excellent moisture sealing and defence against water contamination into the high voltage cable.
Proposed Solution: Heat Shrink Wraparound Cable Repair System
Cable Type: 115kV HXLP-LS 800sqmm (Spec IEC 840)
The cable oversheath manufactured from polyethylene material with a nominal thickness of 4.75mm and minimum thickness of 3.73mm incurred jacket damage in service and required repair to prevent potential outage to the high voltage power cable system.
Â
The following Comments from the cable manufacturer were noted with respect to the site condition of the cable and the proposed repair using “heat shrink wraparounds”:
HV Cables
Phelps Dodge International (Thailand) Limited (PDITL) was established in 1968 as a joint-venture between an existing Thai firm and Phelps Dodge Corporation – PDITL are pioneers in the local industry and were the first company to introduce the majority of new processes, products and technology related to wire and cable manufacturing. PDITL is the only supplier in Thailand with complete in-house facilities for testing power cable up to 400kV.
PDITL has got its certification type test from International Independent Laboratories such as KEMA, Cable Technology Lab, etc. for LSHF cable, Fire resistant cable, Medium voltage, High voltage and Extra high voltage XLPE cables up to 245kV cables.
PDITL manufactures world-class quality wire and cable, not only for the local market but also for international markets, complying with strict international standards. It is proud of its customer services and long term relationships. PDITL has a team of over 700 employees, which are most important assets.
High Voltage Cable Manufacturer – PDIT
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.
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.
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...
