FIRE CABLE COATING
IN SOUTH AFRICA
Fire cable coating is a passive fire-protection solution applied to electrical cables, cable bundles and cable-tray installations to reduce flame propagation along cable surfaces. It is particularly valuable in facilities where extensive cabling passes between plant areas, electrical rooms, risers, control rooms and other critical spaces.
FJ Group Africa provides fire cable coating assessment, supply and professional application services for commercial, industrial, mining, power, telecommunications and infrastructure projects across South Africa. Every installation is planned around the cable type, cable loading, tray arrangement, environmental exposure, required test standard, approved dry-film thickness and the manufacturer’s current technical documentation.
A fire cable coating should not be selected or applied as ordinary paint. Its performance depends on the tested product, surface preparation, application thickness, drying conditions and final quality control. The complete installation must match the project specification and applicable approval.
What is fire cable coating?
Fire cable coating is a specially formulated coating designed to limit the spread of flame over electrical cable insulation and cable bundles. Products such as ablative cable coatings are typically applied by brush, roller or airless spray to create a continuous protective layer around the exposed cable surfaces.
When exposed to intense heat or flame, an ablative coating reacts and forms a protective insulating layer. This reaction helps slow heat transfer to the cable surface and reduces the rate at which fire can travel along the cable route. The coating supports the building’s passive fire-protection strategy by limiting cable-related flame spread and helping contain an incident within the affected area.
The coating is not a fire-detection system and does not extinguish a fire. It is also not automatically a substitute for fire-resistant cable, circuit-protection systems, penetration seals, fire-rated enclosures or active fire suppression. Each of these measures performs a different function and may be required together in a complete fire-safety design.
Why cables can contribute to fire spread
Modern facilities contain large quantities of power, control, instrumentation, data and communications cables. These cables often run continuously through cable trays, vertical shafts, tunnels, ceiling voids and plant areas. If the outer insulation or sheathing becomes involved in a fire, the cable route can provide a path for flame and heat to travel beyond the original location.
Congested cable trays can increase the challenge because heat may become trapped between cable layers. Dust, oil contamination, combustible debris and limited access can further increase risk. In industrial environments, ignition may originate from electrical faults, hot work, overheated equipment, mechanical damage or an external process fire.
How ablative fire cable coating works
Ablative cable coating is formulated to react under fire exposure. As temperature rises, the coating forms a heat-insulating barrier that protects the cable surface and slows the transfer of heat into the cable insulation. This action can reduce continued flame propagation along the coated cable route.
The protective effect depends on a continuous coating of the correct dry-film thickness. Thin areas, missed cable surfaces, uncoated gaps, contamination or mechanical damage can reduce performance. The system must therefore be applied methodically and inspected after drying.
Some modern cable coatings are water-based, solvent-free and designed for internal or external use.
Product characteristics vary, and claims such as weather resistance, ultraviolet resistance, water resistance, low odour, halogen-free formulation or no cable derating must be confirmed against the specific product’s current technical data and approval documents.
Fire propagation protection versus circuit integrity
Fire cable coating is commonly described as protecting cables during a fire, but it is important to define the intended performance accurately. A flame-propagation coating is primarily intended to reduce fire spread along the cable surface. It does not automatically prove that an electrical circuit will continue operating for a specified period during a fire.
Circuit integrity depends on the complete cable system, including the cable construction, supports, fixings, joints, containment and installation method. Where emergency lighting, fire alarms, smoke-control systems, pumps or other life-safety equipment must remain operational, a separately tested circuit-integrity solution may be required.
The project specification should therefore distinguish between flame-spread control and functional circuit survival. FJ Group Africa reviews the required outcome before recommending a cable coating or related fire-protection system.
Typical applications
Fire cable coating may be suitable for cable routes in:
- Power stations, substations and electrical distribution facilities
- Mining plants, processing facilities and conveyor environments
- Petrochemical, oil and gas installations
- Factories, manufacturing plants and production facilities
- Data centres, server facilities and telecommunications sites
- Control rooms, motor control centres and switch rooms
- Cable tunnels, service risers and technical shafts
- Transport infrastructure and large commercial buildings
- Warehouses, logistics facilities and automated distribution centres
- Critical cable trays passing through high-risk operational areas
Suitability must be confirmed for the actual cable types, environmental conditions and fire-safety objective. A coating intended for indoor cable trays should not automatically be used outdoors, in permanently wet areas, in chemically aggressive environments or on cables operating outside the permitted temperature range.
Key benefits of a professionally applied system
Reduced flame propagation. The coating is designed to restrict fire travel along cable surfaces and bundles when installed to the tested specification.
Protection for complex cable routes. Brush, roller or spray application can cover long runs, congested trays and irregular cable arrangements.
Integration with existing installations. Suitable coatings can often be applied to existing cable systems after assessment and preparation.
Minimal additional space. The applied coating creates a protective layer without requiring a large enclosure around the cable tray.
Flexible application methods. Product and site conditions may allow brush, roller or airless spray application.
Support for high-risk environments. Cable coating can strengthen the passive fire-protection strategy in industrial and critical facilities.
These benefits depend on approved product selection, correct thickness and complete coverage. Applying an unverified coating or reducing the specified quantity to save material can create a false impression of protection.
Design and specification requirements
A fire cable coating specification should identify the exact product or approved equivalent, applicable test method, exposure conditions, required dry-film thickness, substrate preparation, application method and inspection criteria. A general instruction to “paint the cables with fireproof paint” is not sufficient.
Before installation, the following should be confirmed:
- The fire-protection objective and required flame-spread performance
- Applicable product approval, test report or project specification
- Cable type, cable-tray arrangement and approximate coated surface area
- Required wet-film and dry-film thickness
- Whether coating is required on all accessible sides of the cable bundle
- Internal, external, wet, dusty, ultraviolet or chemical exposure
- Permitted application and curing temperature
- Compatibility with existing cable sheathing and previous coatings
- Access, isolation, shutdown and safe-working requirements
- Inspection method and handover documentation
Where the installation does not match the tested application, the deviation should be referred to the product manufacturer, fire engineer or responsible designer. Site teams should not create their own thickness, coverage or mixing rules.
Surface preparation
Surface preparation is essential for adhesion and long-term performance. Cables and trays must be checked for dust, oil, grease, moisture, loose contamination, corrosion products and incompatible coatings. Cleaning must follow the manufacturer’s instructions and should not damage cable sheathing, labels or electrical components.
The cable system must be safely isolated or protected where required by the risk assessment. Nearby equipment, labels, connectors, ventilation openings and sensitive components should be masked where overspray or coating build-up is not permitted.
Application by brush, roller or spray
The selected application method depends on the product, cable density, access, project size and surrounding environment. Brush application provides control around small bundles, brackets and difficult edges. Rollers may be useful on accessible broad surfaces. Airless spray can support efficient application over long cable routes when masking, ventilation and overspray control are properly managed.
Thixotropic products are designed to remain in place on vertical and overhead surfaces, but multiple coats may still be required. Each coat should be applied evenly, allowing the specified interval or curing condition before the next layer. Wet-film gauges or another approved measurement method should be used during application.
The installer must account for shrinkage between wet and dry film. The required dry-film thickness cannot be judged reliably by colour alone.
Final coverage should be continuous without pinholes, cracks, heavy runs, exposed cable areas or excessive build-up.
Inspection and quality control
A completed cable coating installation should be inspected before handover. Quality control is not limited to confirming that the cables appear white or fully painted. The inspection must verify that the approved product was used, the required area was covered and the specified thickness was achieved.
Inspection records should include:
- Product name, batch numbers and expiry dates
- Area, cable route and tray identification
- Surface condition and preparation completed
- Application method and number of coats
- Wet-film and final dry-film thickness readings
- Ambient temperature and relevant curing conditions
- Photographs before, during and after application
- Visible defects, repairs and final acceptance
- Installer details and completion date
Representative measurements should be taken across the installation, including edges, underside areas and difficult locations. Thin or missed sections should be repaired before the area is accepted.
Standards, testing and approvals
Cable coating products may be tested to standards addressing flame propagation on vertically installed bunched cables, including parts of IEC 60332-3, or to other recognised test and approval programmes. Some products may also carry Factory Mutual or other third-party approvals for specific applications.
The presence of a test logo or general product certificate does not mean that every cable arrangement is approved. The project team must review the scope of the test, coating thickness, cable type, installation orientation, environmental exposure and any stated limitations.
South African projects may also be governed by the approved fire design, SANS 10400-T requirements, client engineering standards, insurer requirements and occupational health and safety procedures. The correct compliance route should be confirmed for each project.
Relationship with fire-stopping penetration seals
Cable coating and penetration sealing perform related but different functions. Cable coating reduces flame propagation along the cable route. A penetration seal restores fire resistance where cables or trays pass through a fire-rated wall or floor.
Where coated cables pass through a compartment boundary, the penetration must still be sealed using a tested firestop system. The selected sealant, board, block, foam or mortar system must be compatible with the coated cables and the approved penetration detail.
Applying cable coating across an unsealed wall opening does not reinstate the fire rating of the wall. Both the cable route and the penetration should be assessed as part of a coordinated passive fire-protection installation.
Maintenance, alterations and repairs
Cable systems change throughout the life of a facility. New cables may be added, old cables removed and tray routes altered. These changes can damage the coating or leave unprotected surfaces. Routine inspections should identify cracks, impact damage, moisture exposure, contamination and later work by other trades.
Repairs should use the compatible coating and follow the original application requirements. The damaged area may require cleaning, edge preparation and additional coats to restore the specified dry-film thickness. Unapproved paint, sealant or general-purpose protective coating should not be used as a substitute.
Fire cable coating services from FJ Group Africa
FJ Group Africa can support the complete cable coating process:
- Site surveys and cable-route assessments
- Review of project specifications and product requirements
- Measurement of cable trays and estimated coating quantities
- Surface preparation and controlled application
- Brush, roller or spray application where appropriate
- Wet-film and dry-film thickness quality checks
- Integration with cable penetration fire-stopping work
- Identification, photographic records and handover documentation
- Inspection and repair of existing cable coating installations
- Coordination with electrical teams, consultants and fire engineers
Our objective is to provide a practical, traceable and specification-compliant cable protection solution that supports the facility’s fire-safety strategy without creating misleading claims about circuit performance.
Frequently asked questions
What does fire cable coating do?
It creates a protective layer over approved cable surfaces to reduce flame propagation and slow heat transfer when exposed to fire. Its exact performance depends on the tested product, coating thickness and installation arrangement.
Does cable coating keep electrical circuits working during a fire?
Not automatically. Flame-spread protection and circuit integrity are different performance requirements. Circuit survival must be demonstrated by the complete tested cable and support system specified for the project.
Can fire cable coating be sprayed onto existing cables?
Often yes, provided the product is compatible with the cable sheathing, the surfaces are correctly prepared and the cable arrangement is within the approved application. A site assessment should be completed first.
How thick must the coating be?
The required dry-film thickness is product- and approval-specific. It must be taken from the current technical data or approved project specification and verified during application. A generic thickness should not be assumed.
Can the coating be used outdoors?
Only products approved for the expected weather, ultraviolet and moisture exposure should be used outdoors. The current manufacturer documentation must confirm suitability and any required protective conditions.
Can FJ Group Africa also seal the wall or floor penetration?
Yes. We can assess the cable route together with the service penetration and install a suitable approved firestop system around the cables or cable tray where required.
Request a fire cable coating assessment or quotation
For fire cable coating in power stations, substations, industrial plants, data centres, cable tunnels or other critical facilities, contact FJ Group Africa. We will review the cable arrangement, environmental conditions, required performance, access and project specification before recommending a suitable solution.
