Duct Seals & Cable Sealing Systems

Cable Duct Seals

Competitive Prices | Large Stocks of Duct Seals | UK & Exports Sales | Technical Support

➡ Failure to correctly and effectively seal cable ducts with compliant duct seals can inflict catastrophic damage to LV-HV electrical distribution networks, substations and power supply. View below our complete ranges of Duct Sealing Products including cable transits to provide a watertight seal and defence against flood damage to low, medium and high voltage cable ducts with additional protection against harmful flammable gas migration and fire spread.

Duct seals and sealing systems are installed by contractors to reinforce the flood defences of MV-HV substations housing critical medium and high voltage power cables and electrical equipment, typically at medium voltage ( 11kV/33kV), high voltage (66kV-132kV) and transmission and distribution grid networks – we can provide expert technical specification, onsite installer training and fast delivery from stock to UK and international projects for both cable ducts and duct seals.

Sealing Cable Duct Entries

In the UK the DNO’s (Distribution Network Operator) hold a statutory requirement to prevent danger due to the influx of water, or any noxious or explosive liquid, hydrocarbon or gas from the surrounding ground into substations, street boxes and buildings. The electric utility will have an approved method and material to seal ducts in all new, altered or retro-fitted cable installations – this includes the sealing of cable ducts where the ducting enters the switch gear building.

These entries such as open cable ducts entering substations or buildings should be sealed with or without cables installed to prevent ingress of water and gas – a common reference point in the UK is Engineering Recommendation ENA-ER G17/3 Leakage Of Flammable Gases.

The CSD range of Duct Seals is a simple to install cable sealing system to provide protection against water ingress, gas migration, fire spread and rodent infestation to electrical substations and buildings through cable duct entries.

CSD NOFIRNO cable duct seals are suitable for the effective sealing of LV MV HV ducting entries with single, multiple or trefoil cable arrangement – this includes armoured power cables.

Duct Seals WIMES | The Water Industry Mechanical and Electrical Specifications (WIMES) define the requirements for a wide range of mechanical and electrical equipment used in the UK water industry including cable duct seals.

Fire Sealing Ducted Cables

The picture opposite shows unsealed electrical ducting and void openings located at a waste water treatment (WTW) plant – the open cable ducts undermine the purpose of the nearby fire door and should be sealed using fire rated cable duct seals.

Typically duct seals should conform to BSEN1366 Part 3 (Fire Resistance Tests For Service Installations. Penetration Seals) – the integrity and insulation protection provided by the fire rated duct sealant will ensure up to 4 hours fire resistance in ducts.

The seals can be customised to suit fire rated sealing applications including substation ducts, partitions, walls, floors, and construction systems including MV-HV switch rooms and transformer grids.

Re-Enterable Cable Duct Seals

Duct sealing system FiloSeal+HD is an engineered universal solution for sealing LV-HV cables and pipes in ducts, boreholes or transit frames.

FiloSeal+HD is very easy to apply regardless of the type of cable scenario in the cable ducts as it uses strong, but flexible hexagonal tubes to support the cable and provide a strong backing for the seal

The unique design of the hexagonal tubes makes positioning and separation of the cables very simple while also providing a strong backing for the MD+ to be applied on.

Flexible, one component, adhesive and sealing compound in a cartridge
Duct seals and kits are complete with backing and mastic to fill an empty duct
High levels of gas and water tightness
Excellent adhesion, applicable to all common building materials
Fire resistance resistant version
Resistant against water, alkaline, chemical agents
Resistant to termites (Mastotermes Darwiniensis)
Resistant to rodents (rats)
Resistant to Hydrogen Sulphide / Methane and many other gases
Non-corrosive sealing of cables
Solvent-free sealing of cable ducts
Shock absorbing
Non-toxic, neutral and almost odourless
Also suitable for limiting the EX-zones during transitions (observes chemical resistance)
Complies with 2011 NEC Articles 225.27, 230.8, 300.5(G), 300.7 (A) on Raceway Seals, and 501.15 (B)(2)
Suitable for any shaped duct/borehole/opening
WIMES Compliant (3.02 2013 6.4.3.2 b)
Quick and easy installation
Seals PVC & PE sheathed cables, PILC, (HD) PE pipes
Engineering duct sealing solution
Suitable for renovations, can be installed retrospectively – re-enterable
Over 25 years of operational experience and expected life cycle

Duct seals suitable for LV-HV power cables in single, trefoil or multiple configurations, including 11kV Triplex and 33kV high voltages

Provides advanced and assured sealing against water and gas for cable ducts, bore holes and openings

Re-enterable sealing system future-proofed for retrofit of new cables or re-routing of existing through cable ducting

Cable duct seals provide protection of substations and basements against flood, fire and gas ingress dangers

Sealing Cable Ducts

Thorne & Derrick distribute proven cable duct sealing products from leading manufacturers CSD Sealing Systems and Filoform with widespread utility approvals and industry acceptance as trusted alternatives to traditional “sticky and tricky” to install mastic seals or regulation violating expanding foam – these duct seal products are technically advanced cable sealing solutions designed to provide guaranteed protection of clients assets without the risk of failure.

Expanding foam spray is effectively banned for sealing cable ducts in electrical and water utility sectors – the soft large cell structure will inevitably break down overtime and fail to provide adequate protection against water ingress or flooding into substations or buildings

Contact Us to discuss your Cable Duct Sealing requirements

CSD Rise Duct Seals

CSD RISE cable duct seals are specified throughout the electric and water utility networks to provide protection of ducts and duct openings against the dangers of water ingress and gas migration with up to 4 hour fire resistance to the spread of flame where cables penetrate fire rated boundaries and building openings – the watertight, gastight and fire resistant seals provide cable duct protection with accelerated age tests concluding a 50 year level of protection.

duct sealing using csd rise seal Systems

Versatile – CSD RISE quickly seals cable ducts in vertical and horizontal configuration
Approved – ATEX compliant for hazardous area cable duct sealing in potentially explosive atmospheres, Zone 1 & Zone 2
Trusted – WIMES (Waters Industry Mechanical & Electrical Specification) accepted for duct sealing in the water utility sector
Re-enterable – CSD duct seals enable simple modification for adding, removing or replacing cables in retrofit projects
Flexible – the sealing system can be employed to seal circular, round or rectangular ducts or building penetrations
High Voltage – 11kV and 33kV substation cable ducts are sealed to protect against flood waters and dangerous corrosive gases
Durable – CSD RISE is resistant to methane, hydrogen sulphide and chlorine
HV Power Cable Duct Seals – specified to seal high voltage and heavy armoured power cables in single, trefoil or Triplex arrangement

Thorne & Derrick are Approved Distributors for CSD providing competitive prices, technical advice and site installation support for duct seals manufactured by CSD Sealing Systems.

Specialist sealing systems are available for cable duct installations under running water conditions – contact T&D for more info.

CSD RISE Duct Seals – combining ease of installation with cable duct sealing and protection against water, gas and fire

Duct Seals ♦ Sealing Cable Ducts ♦ 11kV 33kV Substations ♦ Watertight Gastight Fireproof ♦ Medium & High Voltage Cable Seals