Duct Seals & Sealing

Duct Seals & Sealing Systems

Duct Seals & Sealing Systems | Watertight | Gastight | Fire Resistant | Resist Rodents | Cable Sealing Products LV MV HV

Cable Duct Seals

➡ Failure to correctly and effectively seal cable ducts 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 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 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.

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.

Fire Sealing CablesFire Sealing Cable Ducts

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.

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

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

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

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

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

Sealing Cable Ducts

T&D 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.

Duct Seals - Sealing Cable Ducts

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


Sealing Cable Ducts

Contact Us to discuss your Cable Duct Sealing requirements

CSD RISE Duct Seals

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 duct protection with accelerated age tests concluding a 50 year level of protection.

duct sealing using csd rise seals
  • 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
  • Power Cables – specified to seal high voltage and heavy armoured power cables in single, trefoil or Triplex arrangement

T&D 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

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