Cable Transits
Green Energy Transition & The Electrification of Society By Roxtec
February 15th, 2022
Green Energy Transition & The Electrification of Society By Roxtec
Green Energy Transition By Roxtec
Cable & Pipe Transits
The Green Energy Transition and the electrification of the society put pressure on the power industry. Sustainable power generation, efficient transmission and distribution, and safe storage are some of the challenges that call for smart protection of equipment against multiple risk factors. That is why Roxtec cable and pipe transits are omni-present – from solar plants and wind farms to long-distance HVDC and grid projects.
As experienced penetration seal provider, Roxtec is involved in the energy transition and contributes to renewable hybrid projects as well as energy storage and balancing of the transmission and distribution grids. The company has a long story within wind power and is cooperating with all major offshore wind operators.
Roxtec provides cable duct seals and expertise to wind farms on land and to solar power plants as well, and participates in a variety of development projects within renewable power generation. With an impressive collection of tests, approvals and certificates, Roxtec also supplies seals to nuclear power projects.
Efficient storage and use
Generating power is, however, not enough. There is a need for reliable energy storage that enables a balanced and optimized use of the electricity grids. When you can store energy, you can take care of the complete harvest from your solar plants and wind farms, even when the grid is too full to handle it. Roxtec is working with world leaders in energy storage, but also within green hydrogen. The latter enables efficient use of excessive renewable energy for preparing green hydrogen instead of wasting it.
Ensuring HVDC transmission
There is also a need for increased transmission to accelerate the transition. The UK is a good example with both extension of offshore wind power and transmission through HVDC, high-voltage direct current. Roxtec follows the cable and provides sealing from the submarine to the land-based cable.

Rob Cullen, Power Sales Manager, Roxtec UK
“We became aware of drawbacks with traditional methods of sealing cable ducted systems between the shore and the local substation. As we have great relationships with cable manufacturers, project developers and delivery partners, it was a simple decision for them when we were able to bring both standard and bespoke sealing solutions,” says Rob Cullen, Power Sales Manager of Roxtec UK, and continues:
“They can now save significant time since Roxtec installations do not require curing time. Our seals also provide advantages in terms of cable management and retention whilst being vermin-proof. When our customers understood we provide training and technical support, they were very happy. As result of this mix of product and support we have managed to secure two major landfall projects and one underground transmission project in the last eighteen months.”
Batteries for charging
Another example within distribution is found in The Netherlands. A growing manufacturer of industrial modular energy storage systems that can be used for every conceivable application such as energy storage, balancing of the electricity grid or fulfill temporary energy requirements, is using Roxtec seals to protect the mobile and stationary battery containers against fire, gas and water.
The industrial storage systems are also used in solar plants of all sizes to enable storage of the produced energy until the right time for usage.
In the same region, Roxtec has become the preferred supplier of seals to onshore landing stations for offshore wind power. The cables used for connecting energy from distant turbines to the onshore grid must be protected from environmental threats, electromagnetic interferences and effects of lightning strikes.
Therefore, the engineering and construction companies have specified Roxtec seals for shielding, bonding and grounding. One landing station can receive power from several offshore wind farms and can have more than 1,000 openings to seal.

Hans Durinck performing installation training with customers onsite
“The thing is to always provide good service,” says Hans Durinck, Manager Outdoor Sales of Roxtec Netherlands. “I often go onsite, and the owners and all the different contractors know that they can call me any time if they have questions regarding our safety solutions. I will not ever try do their job, but I can certainly take away some of their troubles. We know sealing, so we bring peace of mind to them.”
CABLE TRANSITS
Roxtec cable transits are used to prevent water, gas, fire, dust and rodents from entering cable duct openings and potentially causing damage to cables and other electrical infrastructure.
Cable transit systems can be designed for sealing medium/high voltage substations including 11kV/33kV and “triplex” type cables in single, multiple or trefoil configuration.
Roxtec modular cable transit seals are based upon a rubber design with seals that are constructed of a number of removable layers to secure a watertight, gas tight and fire proof seal around the cable or pipe – the range includes rectangular transits and round transits to fit a variety of pipes and cable sizes.
Cable transit products ensure safety, reliability and efficiency by providing an effective, dependable seal around cables and pipes through an opening, penetration or duct.

Supplying Cable Termination, Jointing, Pull-in & Electrical Equipment up to 66kV
Thorne & Derrick International are Specialist Suppliers to the UK and international Offshore Wind Industry of products to provide safe and reliable LV HV Electrical Cable Termination, Jointing, Installation & Power Systems up to 66kV.
We are based in North-East England, recognised as a key strategic location to service the offshore renewables energy market in the UK, from the North Sea to the Nordics – our Exports Division support international offshore wind power projects from USA to China.

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

Stockists & Suppliers | UK & International Projects
Cable and Pipe Transits For Naval Vessels
September 3rd, 2021
Cable Transits & Duct Seals
Increased Safety & Security
With world class cable transits protecting against multiple risks, you pave the way for maximum survivability. Cable transits and duct seals from Roxtec are your solution for safety, EMI/EMP protection and blast load resistance.
The vibration damping, the area efficiency and the light-weight nature of the pipe seals contribute to a more silent operation and more free space onboard. Roxtec solutions simplify everything – from planning to future upgrades.
Application areas
Explore the multitude of applications where you can benefit from Roxtec’s solutions.
Cabinets & enclosures

Roxtec CF 8/32 Transit
Roxtec multi-cable transits offer several additional customer benefits and can entirely replace cable glands. Use Roxtec’s compact, area efficient seals to ensure EMI/EMP protection and to be able to reduce the size of your cabinets, junction boxes and enclosures as well as to reduce engineering hours spent on cable data and cable gland configurations.
Why use Roxtec?
- Watertight
- Gas-tight
- Dust-tight
- One cut-out for dozens of pre-terminated cables which may vary in size
- Built-in spare capacity for upgrades and retrofits
- Solutions for armoured cables
- EMC solutions for electrical safety
- Ex solutions for hazardous locations
Recommended Sealing Solutions
| Description | Fire | Tightness | |
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Roxtec S Transit Transit for welding to the structure. For welding into a precise aperture. |
A-CLASS H-CLASS |
Gas: 2.67 bar (catastrophic) Water: 4 bar (catastrophic) |
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Roxtec HD Transits High cable density transit device with frame in 316L. For harsh environments. |
N/A | IP66/IP67 UL/NEMA 4.4X, 12, 13 |
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Roxtec HD Ex Transits High cable density transit devices for Ex environments with frame in 316L. |
N/A | IP66/IP67 UL/NEMA 4.4X, 12, 13 Ex e/ Ex tb |
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Roxtec CF 8/32 Transit High cable density transit with aluminium frame |
N/A | IP66/IP67 UL/NEMA 4.4X, 12, 13 |
Command control room

Roxtec S Transit
Roxtec cable transits ensure electromagnetic shielding and protect equipment both inside, and around the command control room. Use Roxtec EMC solutions to secure data, communication and high-precision operation in order to improve survivability.
Why use Roxtec?
- EMI/EMP protection
- Watertight
- Firestop
- Gas-tight
- Dust-tight
- Blast load resistant
- Flexibility for cables of different sizes
- Built-in spare capacity for upgrades and retrofits
- EMC solutions for electrical safety
Recommended Cable & Pipe Sealing Solutions
| Description | Fire | Tightness | |
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Roxtec S Transit Transit for welding to the structure. For welding into a precise aperture. |
A-CLASS H-CLASS |
Gas: 2.67 bar (catastrophic) Water: 4 bar (catastrophic) |
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Roxtec RS Seal Penetration seal for a single cable or pipe. For installation in existing sleeves or core drilled holes. |
A-CLASS H-CLASS EI 60 EI 120 UL 1479 |
Gas: 2.67 bar (catastrophic) Water: 4 bar (catastrophic) |
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Roxtec CF 8/32 Transit High cable density transit with aluminium frame. For high demand areas. |
N/A | IP66/IP67 UL/NEMA 4.4X, 12, 13 |
Communication area – Crypto & Sonar
Roxtec cable and pipe transits ensure electromagnetic shielding both inside, and around the sonar and crypto rooms. Use EMC solutions to protect equipment and create an internal barrier for sensitive information. Stop RFI, optimize communication security and ensure safety and survivability.

Roxtec RS Cable Transit Frame
Why use Roxtec?
- EMI/EMP protection
- Watertight
- Firestop
- Gas-tight
- Dust-tight
- Flexibility for cables and pipes of different sizes
- Built-in spare capacity for upgrades and retrofits
- EMC solutions for electrical safety
Recommended Cable & Pipe Sealing Solutions
| Description | Fire | Tightness | |
![]() |
Roxtec S Transit Transit for welding to the structure. For welding into a precise aperture. |
A-CLASS H-CLASS |
Gas: 2.67 bar (catastrophic) Water: 4 bar (catastrophic) |
![]() |
Roxtec RS Seal Penetration seal for a single cable or pipe. For installation in existing sleeves or core drilled holes. |
A-CLASS H-CLASS EI 60 EI 120 UL 1479 |
Gas: 2.67 bar (catastrophic) Water: 4 bar (catastrophic) |
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Roxtec CF 8/32 Transit High cable density transit with aluminium frame. For high demand areas. |
N/A | IP66/IP67 UL/NEMA 4.4X, 12, 13 |
Engine room
Roxtec cable and pipe penetration seals are perfectly suited for large cables and pipes entering the engine room through decks and bulkheads. Use Roxtec transits to ensure the best possible protection for the heart of the ship.

Roxtec S Transit for Engine Rooms
Why use Roxtec?
- Watertight
- Gas-tight
- Firestop
- EMI/EMP protection
- One opening for dozens of cables and pipes
- Flexibility for cables and pipes of different sizes
- EMC solutions for electrical safety
| Description | Fire | Tightness | |
![]() |
Roxtec S Transit Transit for welding to the structure. For welding into a precise aperture. |
A-CLASS H-CLASS |
Gas: 2.67 bar (catastrophic) Water: 4 bar (catastrophic) |
![]() |
Roxtec RS Seal Penetration seal for a single cable or pipe. For installation in existing sleeves or core drilled holes. |
A-CLASS H-CLASS EI 60 EI 120 UL 1479 |
Gas: 2.67 bar (catastrophic) Water: 4 bar (catastrophic) |
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Roxtec R Transit Round transit for sealing around multiple cables and pipes in a limited area. For installation in existing sleeves. |
A-CLASS H-CLASS EI 60 EI 120 UL 1479 |
Gas: 2.67 bar (catastrophic) Water: 4 bar (catastrophic) |
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Roxtec R X Transit Transit for sealing around multiple cables and pipes in a limited are without welding or bolting. For attachment through expansion. |
A-CLASS | Gas: 2.67 bar (catastrophic) Water: 4 bar (catastrophic) |
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Roxtec CF 8/32 Transit High cable density transit with aluminium frame. For high demand areas. |
N/A | IP66/IP67 UL/NEMA 4.4X, 12, 13 |
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Roxtec RS X Seal Transit for use when welding is not allowed, recommended or desired. For high pressure penetrations. |
A-CLASS | Gas: 2.67 bar (catastrophic) Water: 4 bar (catastrophic) |
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Roxtec SBTB Transit Transit with metal frame for an extra level of fire protection. For high fire demands. |
A-CLASS H-CLASS |
Gas: 2.67 bar (catastrophic) Water: 4 bar (catastrophic) |
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Roxtec SF Transit Cable and pipe transit with metal frame and flange for welding to the structure. For wide aperture tolerance when welding. |
A-CLASS H-CLASS UL 1479 |
Gas: 2.67 bar (catastrophic) Water: 4 bar (catastrophic) |
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Roxtec SFHM Transit with metal frame and flange for bolting to the structure. |
A-CLASS H-CLASS |
Water: 4 bar (catastrophic) |
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Roxtec SRC r20 Transit Transit with metal frame for load-bearing structures. Corner radius 20mm. |
A-CLASS H-CLASS |
Gas: 2.67 bar (catastrophic) Water: 4 bar (catastrophic) |
Gas-tight areas
Roxtec seals are not only your solution for safety, they provide EMI/EMP protection and excellent blast load resistance. Additionally, the transits reduce vibration and are area efficient in order to allow more free space onboard.

Roxtec SBTB Transit for Gas-Tight Area
Why use Roxtec?
- Watertight
- Firestop
- Gas-tight
- Flexibility for cables and pipes of different sizes
- Built-in spare capacity for upgrades and retrofits
- Back-to-back solutions for increased protection
| Description | Fire | Tightness | |
![]() |
Roxtec S Transit Transit for welding to the structure. For welding into a precise aperture. |
A-CLASS H-CLASS |
Gas: 2.67 bar (catastrophic) Water: 4 bar (catastrophic) |
![]() |
Roxtec RS Seal Penetration seal for a single cable or pipe. For installation in existing sleeves or core drilled holes. |
A-CLASS H-CLASS EI 60 EI 120 UL 1479 |
Gas: 2.67 bar (catastrophic) Water: 4 bar (catastrophic) |
![]() |
Roxtec R Transit Round transit for sealing around multiple cables and pipes in a limited area. For installation in existing sleeves. |
A-CLASS H-CLASS EI 60 EI 120 UL 1479 |
Gas: 2.67 bar (catastrophic) Water: 4 bar (catastrophic) |
![]() |
Roxtec SBTB Transit Transit with metal frame for an extra level of fire protection. For high fire demands. |
A-CLASS H-CLASS |
Gas: 2.67 bar (catastrophic) Water: 4 bar (catastrophic) |
![]() |
Roxtec SF Transit Cable and pipe transit with metal frame and flange for welding to the structure. For wide aperture tolerance when welding. |
A-CLASS H-CLASS UL 1479 |
Gas: 2.67 bar (catastrophic) Water: 4 bar (catastrophic) |
Hydraulic and compressed air systems
Roxtec’s round cable transits and rectangular penetration seals are ideal for single or multiple cables, pipes and tubes. Use Roxtec transits to ensure certified fire protection in A-0 to A-60 rated areas and maintain the ability to reopen the seals whenever you need.

Roxtec R Transit for Hydraulic & Compressed Air Systems
Why use Roxtec?
- Watertight
- Firestop
- Vibration damping
- Noise reduction
- One opening for dozens of cables and pipes
- Flexibility for cables and pipes of different sizes
- Ex solutions for hazardous locations
| Description | Fire | Tightness | |
![]() |
Roxtec S Transit Transit for welding to the structure. For welding into a precise aperture. |
A-CLASS H-CLASS |
Gas: 2.67 bar (catastrophic) Water: 4 bar (catastrophic) |
![]() |
Roxtec RS Seal Penetration seal for a single cable or pipe. For installation in existing sleeves or core drilled holes. |
A-CLASS H-CLASS EI 60 EI 120 UL 1479 |
Gas: 2.67 bar (catastrophic) Water: 4 bar (catastrophic) |
![]() |
Roxtec R Transit Round transit for sealing around multiple cables and pipes in a limited area. For installation in existing sleeves. |
A-CLASS H-CLASS EI 60 EI 120 UL 1479 |
Gas: 2.67 bar (catastrophic) Water: 4 bar (catastrophic) |
![]() |
Roxtec R X Transit Transit for sealing around multiple cables and pipes in a limited area without welding or bolting. |
A-CLASS H-CLASS |
Gas: 2.67 bar (catastrophic) Water: 4 bar (catastrophic) |
![]() |
Roxtec RS OMD Seal Flexible transit with adaptable outside to fit non-standard sleeve sizes. |
A-CLASS H-CLASS UL 1479 |
Gas: 2.67 bar (catastrophic) Water: 4 bar (catastrophic) |
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Roxtec RS X Seal Transit for use when welding is not allowed, recommended or desired. For high pressure penetrations. |
A-CLASS | Gas: 2.67 bar (catastrophic) Water: 4 bar (catastrophic) |
Power Generators, Motors and Thrusters
Roxtec cable seals are perfect for large cables entering the engine room through decks and bulkheads. Use Roxtec transits to achieve well-organized pipe penetrations and cable entries both inside, and around machine areas and engine control rooms. Also, benefit from savings resulting from the reduced space requirements of cabinets and enclosures.

Roxtec ComSeal
Why use Roxtec?
- Watertight
- Firestop
- EMI protection
- Dust-tight
- One opening for dozens of cables
- Flexibility for cables and pipes of different sizes
- EMC solutions for electrical safety
| Description | Fire | Tightness | |
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Roxtec CF 8/32 Transit High cable density transit with aluminium frame. For high demand areas. |
N/A | IP66/IP67 UL/NEMA 4.4X, 12, 13 |
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Roxtec ComSeal IP55 rated entry seals with aluminium frame |
N/A | IP55 UL/NEMA 3, 12, 12K |
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Roxtec C RS T Seal Round seal for single cable entries |
N/A | IP66/67 IP69K UL/NEMA 4, 4X, 12, 13 |
Water pipes
Regardless of your preferred pipe material, Roxtec has the sealing solution. Roxtec pipe seals are A-0 and A-60 approved for all metal and most plastic pipes.
Use them to ensure watertight deck and bulkhead penetrations, to avoid the risk of water spreading from any leaking pipes and to be able to reopen the transits whenever you need.

Roxtec RS Seal for Water Pipes
Why use Roxtec?
- Watertight
- Firestop
- Vibration damping
- Certified solution
- Easy and safe installation of pipes
- Can be used for fresh, chilled and waste water
| Description | Fire | Tightness | |
![]() |
Roxtec S Transit Transit for welding to the structure. For welding into a precise aperture. |
A-CLASS H-CLASS |
Gas: 2.67 bar (catastrophic) Water: 4 bar (catastrophic) |
![]() |
Roxtec RS Seal Penetration seal for a single cable or pipe. For installation in existing sleeves or core drilled holes. |
A-CLASS H-CLASS EI 60 EI 120 UL 1479 |
Gas: 2.67 bar (catastrophic) Water: 4 bar (catastrophic) |
![]() |
Roxtec R X Transit Transit for sealing around multiple cables and pipes in a limited area without welding or bolting. |
A-CLASS H-CLASS |
Gas: 2.67 bar (catastrophic) Water: 4 bar (catastrophic) |
![]() |
Roxtec SPM Seal Seal for metal pipes for use when welding is not allowed, recommended or desired. Easy to install without welding. |
A-CLASS | Gas: 0.67 bar (catastrophic) Water: 1 bar (catastrophic) |
![]() |
Roxtec RS OMD Seal Flexible transit with adaptable outside to fit non-standard sleeve sizes. |
A-CLASS H-CLASS UL 1479 |
Gas: 2.67 bar (catastrophic) Water: 4 bar (catastrophic) |
![]() |
Roxtec RS X Seal Transit for use when welding is not allowed, recommended or desired. For high pressure penetrations. |
A-CLASS | Gas: 2.67 bar (catastrophic) Water: 4 bar (catastrophic) |
![]() |
Roxtec RS PPS Penetration seal for large single plastic pipes. For installation in existing sleeve. |
A-CLASS | Gas: 2 bar (catastrophic) Water: 4 bar (catastrophic) |
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Roxtec S with SE PPS Transit for multiple plastic pipes. For welding into precise openings. |
A-CLASS | Gas: 2.5 bar (catastrophic) Water: 4 bar (catastrophic) |
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Roxtec Sleev-it Fire Penetration Seal Fire penetration seal for single plastic pipes. For fire rated divisions. |
A-CLASS B-CLASS |
N/A |
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Roxtec Sleev-it Waterproof Penetration Seal Penetration seal for plastic pipes for basic protection against fire, gas & water. Waterproof seal for exact/fixed pipe diameters. |
A-CLASS B-CLASS |
Water: 1 bar (catastrophic) |
Further Reading
- Flexible Cable Seals for Gas Insulated Substations
- Data Centres | Safely Sealing LV HV Cables & Electrical Equipment
- Roxtec Pipe & Cable Seals | Offshore & Onshore Windfarm Product Spotlight
- Sealing Cables & Pipes Using Roxtec | Battery Storage Applications
Cable Sealing Using Roxtec
Roxtec cable seals are used in cable vaults, duct banks, electrical substations, trenches and M&E building services protecting low, medium and high voltage power systems against numerous external risk factors:
- Fire – A60, H120 Class bulkhead sealing for offshore classification against jet-fire or spray and prevention of suffocating smoke spread
- Gas – ensure complete tightness against air and gas pressure or migration through cable ducts with DSEAR compliance
- Water – prevent flood and water penetration into substations and buildings – avoid humidity and partial discharge conditions
- Cables – withstand cable bending load in heavy power and high voltage cable seal applications
- Pressure – protect against catastrophic sudden or constant pressure
- Electrical – protect cables and electrical infrastructure against EMI, EMP and lightning strike effects
- Particles – control levels of of dirt, dust, chemical and fumigants from entering buildings, cable ducts and substations
- Blast – protect against vibration, shock-waves and the risk of explosion in industrial and hazardous area locations

Cable Transits – Sealing Cables & Pipes
Cable Transits
Roxtec cable transits are used to prevent water, gas, fire, dust and rodents from entering cable duct openings and potentially causing damage to cables and other electrical infrastructure.
Cable transit systems can be designed for sealing medium/high voltage substations including 11kV/33kV and “triplex” type cables in single, multiple or trefoil configuration.
Roxtec modular cable transit seals are based upon a rubber design with seals that are constructed of a number of removable layers to secure a watertight, gas tight and fire proof seal around the cable or pipe – the range includes rectangular transits and round transits to fit a variety of pipes and cable sizes.
Cable transit products ensure safety, reliability and efficiency by providing an effective, dependable seal around cables and pipes through an opening, penetration or duct.

LV MV HV Jointing, Earthing, Substation & Electrical Eqpt
Sealing Cables & Pipes Using Roxtec | Battery Storage Applications
July 30th, 2021
Cable entry seals
for the energy storage industry
Sealing Cabinets & Enclosures
Roxtec’s area efficient seals are ideal for entries to power conversion system (PCS) enclosures, transformers, switchgear and other cabinet applications with high cable density.
Protect your Low & High Voltage Electrical Equipment by an organised cable entry manufactured by Roxtec that is also openable to simplify maintenance and sudden changes for future retrofit and cable alterations and additions.

Cabinets & Enclosures
Sealing Buildings & Containers
Roxtec cable and pipe seals work efficiently in above ground and underground walls and floors in buildings, battery storage containers, PCS enclosures and kiosks. Avoid fire, water, humidity and animal issues in your buildings and battery storage containers.

Buildings & Containers
➡ View the Roxtec range of Rectangular Cable Seals & Transit Frames & Round Cable Transit Frames & Cable Seals
Why use Roxtec?
- Firestop
- Vapor-tight
- Animal mitigation
- Watertight
- Bonding, grounding and EMI protection
- Cable retention
Superior simplicity
- One cut-out for dozens of pre-terminated cables
- Flexibility for cables and pipes of different sizes
- Built-in spare capacity for future cables and pipes
Standardise for protection and spare capacity
Use Roxtec cable and pipe seals to minimise the risk of downtime caused by fire, animals, water and dust. Install them in power conversion system (PCS) enclosures, battery buildings and containers, substation equipment and transformers.
Roxtec seals are extremely space efficient and can be used for new or retrofit applications. Built-in spare capacity enables installers to quickly add cables without having to cut or punch new holes in the equipment.
Further Reading
Flexible Cable Seals for Gas Insulated Substations
Data Centres | Safely Sealing LV HV Cables & Electrical Equipment
Roxtec Pipe & Cable Seals | Offshore & Onshore Windfarm Product Spotlight
Cable Sealing Using Roxtec
Roxtec cable seals are used in cable vaults, duct banks, electrical substations, trenches and M&E building services protecting low, medium and high voltage power systems against numerous external risk factors:
- Fire – A60, H120 Class bulkhead sealing for offshore classification against jet-fire or spray and prevention of suffocating smoke spread
- Gas – ensure complete tightness against air and gas pressure or migration through cable ducts with DSEAR compliance
- Water – prevent flood and water penetration into substations and buildings – avoid humidity and partial discharge conditions
- Cables – withstand cable bending load in heavy power and high voltage cable seal applications
- Pressure – protect against catastrophic sudden or constant pressure
- Electrical – protect cables and electrical infrastructure against EMI, EMP and lightning strike effects
- Particles – control levels of of dirt, dust, chemical and fumigants from entering buildings, cable ducts and substations
- Blast – protect against vibration, shock-waves and the risk of explosion in industrial and hazardous area locations

Cable Transits – Sealing Cables & Pipes
Cable Transits
Roxtec cable transits are used to prevent water, gas, fire, dust and rodents from entering cable duct openings and potentially causing damage to cables and other electrical infrastructure.
Cable transit systems can be designed for sealing medium/high voltage substations including 11kV/33kV and “triplex” type cables in single, multiple or trefoil configuration.
Roxtec modular cable transit seals are based upon a rubber design with seals that are constructed of a number of removable layers to secure a watertight, gas tight and fire proof seal around the cable or pipe – the range includes rectangular transits and round transits to fit a variety of pipes and cable sizes.
Cable transit products ensure safety, reliability and efficiency by providing an effective, dependable seal around cables and pipes through an opening, penetration or duct.

LV MV HV Jointing, Earthing, Substation & Electrical Eqpt
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
Flexible Cable Seals for Gas Insulated Substations
June 30th, 2021
Flexible Cable Seals
“Roxtec experts responded quickly, and we saved a lot of time”
The Kotlovka 220/20 kV substation in Moscow, Russia needed fire-rated, gas-tight, and removable seals for the cables coming up through the floor to the GIS room.
Roxtec created a solution covering all these requirements.
As the sealing solution is quite demanding, Roxtec provided extra technical support to the staff of the installation company.
Roxtec representatives held installation training and performed onsite control in order to make sure that everyone involved in the project was fully satisfied.
Project facts
- Project Description – Construction of the Kotlovka 220/20 kV substation in Moscow, Russia
- Involved Companies – OEK (United Energy Company) and Enrgokompleks – owners InjEnergoProekt – designer InjPromEnergo – contractor
- Applications – Sealing solutions for cable entries from cable cellar to GIS room
- Sealing Requirements – Gas-tight and fire rated for 45 minutes

➡ To read more about the case click here
Cable Sealing Using Roxtec
Roxtec cable seals are used in cable vaults, duct banks, electrical substations, trenches and M&E building services protecting low, medium and high voltage power systems against numerous external risk factors:
- Fire – A60, H120 Class bulkhead sealing for offshore classification against jet-fire or spray and prevention of suffocating smoke spread
- Gas – ensure complete tightness against air and gas pressure or migration through cable ducts with DSEAR compliance
- Water – prevent flood and water penetration into substations and buildings – avoid humidity and partial discharge conditions
- Cables – withstand cable bending load in heavy power and high voltage cable seal applications
- Pressure – protect against catastrophic sudden or constant pressure
- Electrical – protect cables and electrical infrastructure against EMI, EMP and lightning strike effects
- Particles – control levels of of dirt, dust, chemical and fumigants from entering buildings, cable ducts and substations
- Blast – protect against vibration, shock-waves and the risk of explosion in industrial and hazardous area locations

Cable Transits – Sealing Cables & Pipes
Cable Transits
Roxtec cable transits are used to prevent water, gas, fire, dust and rodents from entering cable duct openings and potentially causing damage to cables and other electrical infrastructure.
Cable transit systems can be designed for sealing medium/high voltage substations including 11kV/33kV and “triplex” type cables in single, multiple or trefoil configuration.
Roxtec modular cable transit seals are based upon a rubber design with seals that are constructed of a number of removable layers to secure a watertight, gas tight and fire proof seal around the cable or pipe – the range includes rectangular transits and round transits to fit a variety of pipes and cable sizes.
Cable transit products ensure safety, reliability and efficiency by providing an effective, dependable seal around cables and pipes through an opening, penetration or duct.

LV MV HV Jointing, Earthing, Substation & Electrical Eqpt
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
Data Centres | Safely Sealing LV HV Cables & Electrical Equipment
June 14th, 2021
Data Centres
Safely Sealing LV HV Cables & Electrical Equipment
Due to the ever-changing data centre environment Roxtec seals were installed on several centres built for a multi-national technology company throughout the USA.
With service continuity as a top priority, the company selected Roxtec system of cable transits as a cable sealing solution.
Roxtec seals would both protect their equipment and provide flexibility for continued growth. Site superintendents, project managers and installers of contractors Structure Tone, IES and Hunt Electric also consider Roxtec a best-fit solution for the industry. Jim Wagner, Senior Project Manager at Hunt Electric coments, “Roxtec is a great product, the best I have seen in the market based on flexibility.”
Roxtec Project facts
Project Description – Construction of data centre in multiple locations in the USA
Owner – Multinational technology company
Installations – Structure Tone, IES, and Hunt Electric
Applications – Walls, trenches and cable trays
Sealing Requirements – Fire-proof, watertight and air-tight

Future Capacity Included
The HVAC systems, power equipment and communications equipment must be updated continuously. Our openable and adaptable seals make it possible to leave room for future capacity. You can easily make changes and upgrades without cutting a new hole. This allows for a dustless re-entry into your contained sensitive environment. Roxtec offers a long-term partnership to protect your data centres and server halls against multiple risks such as fire, flooding and air leakage.
Unbeatable Sealing & Protection of Cables
Roxtec provided sealing solutions for both exterior and interior penetrations keeping water and fire from causing damage and downtime all while providing airtightness and increasing the efficiency of the data centre.
Contractor Approved
Roxtec seals are easy to install, adapt and reseal. Ross Catlett of IES states:
“It is significantly easier to install Roxtec than using solutions like foam and the bags that you have to pack and fill in.”
After participating in Roxtec’s training and becoming an approved installer he can now train new employees as they come onsite or continue on to future projects.

Why use Roxtec?
- Watertight firestop
- Air-flow management
- Easy to use and install
- Flexibility for changes
- Built-in spare capacity
- Dustless re-entry
Roxtec cable seals are used in cable vaults, duct banks, electrical substations, trenches and M&E building services protecting low, medium and high voltage power systems against numerous external risk factors:
- Fire – A60, H120 Class bulkhead sealing for offshore classification against jet-fire or spray and prevention of suffocating smoke spread
- Gas – ensure complete tightness against air and gas pressure or migration through cable ducts with DSEAR compliance
- Water – prevent flood and water penetration into substations and buildings – avoid humidity and partial discharge conditions
- Cables – withstand cable bending load in heavy power and high voltage cable seal applications
- Pressure – protect against catastrophic sudden or constant pressure
- Electrical – protect cables and electrical infrastructure against EMI, EMP and lightning strike effects
- Particles – control levels of of dirt, dust, chemical and fumigants from entering buildings, cable ducts and substations
- Blast – protect against vibration, shock-waves and the risk of explosion in industrial and hazardous area location
➡ Further Reading | Connecting High Voltages & Energising Data Centres
THORNE & DERRICK
SPECIALIST ELECTRICAL DISTRIBUTOR
Thorne & Derrick distribute the most extensive range of Cable Installation & Electrical Distribution Equipment to the Power Transmission & Distribution industry in the onshore and offshore wind, solar, rail, oil/gas, data centre, battery storage and utility sectors.
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.
- Key Products: MV-HV Cable Joints & Terminations, Cable Cleats, Duct Seals, Cable Transits, Underground Cable Protection, Copper Earth Tapes, Cable Jointing Tools, Feeder Pillars, Cable Ducting, Earthing & Lightning Protection, Electrical Safety, Cable Glands, Arc Flash Protection & Fusegear.
- Distributors for: 3M Cold Shrink, ABB, Alroc, Band-It, Catu, Cembre, Centriforce, CMP, Elastimold, Ellis Patents, Emtelle, Furse, Lucy Zodion, Nexans Euromold, Pfisterer, Polypipe, Prysmian, Roxtec.

LV – Low Voltage Cable Joints, Glands, Cleats, Lugs & Accessories (1000 Volts)

MV HV – Medium & High Voltage Cable Joints, Terminations & Connectors (11kV 33kV EHV)




















