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What Types of Electrical Penetrations We Cover
Single Cables
The simplest type of penetration, where one or more cables pass individually through a wall or floor.
Mainly used for lighting, power outlets, telephone, or network lines.
Firestopping is applied around the cable or the gap using acrylic sealant, intumescent materials, or foam.
Cable Bundles
Multiple cables grouped in a bundle, typically running to or from electrical panels, substations, or data racks.
The firestop must handle simultaneous exposure to high temperatures, varying ignition points, and a large volume of material.
High-density fire-resistant materials, proper installation, and full compliance with certification testing are required.
Electrical Conduits (Spirals)
Spiral plastic conduits containing cables, commonly found in false ceilings, walls, or vertical shafts.
The firestop must protect both the outer conduit and the internal cables.
A combination of sealant and intumescent product is typically required.
Cable Trays
Metal or plastic cable trays carrying multiple cables in horizontal or vertical arrangements.
The firestop must cover the full cross-section of the tray and withstand multiple ignition points.
Fire-resistant boards, intumescent bricks, or firestop cushions are used—especially in installations where easy access or future cable modifications are required.
Fiber Optic and Telecommunications Cables
Thin and sensitive cables with specific requirements for thermal and mechanical protection.
The firestop must shield against thermal radiation without deforming or compressing the core.
Fire-resistant foam materials, coatings, and flexible fillers are typically used.
Mixed Cable and Pipe Penetrations
Complex penetrations where electrical and mechanical installations (e.g., cables and pipes) coexist in the same opening.
Firestopping is designed based on the total thermal load and the specifications of each material.
Multifunctional systems using intumescent bricks, sealants, and intumescent coatings are applied.
Cable Penetration Firestops
Electrical penetrations are among the most critical and vulnerable points in any building when it comes to passive fire protection. Cables, trays, and corrugated conduits can act as channels for the spread of flames and smoke from one fire compartment to another.
Cable penetration firestops are specialized systems applied wherever electrical installations pass through fire-rated walls or floors. Their purpose is to maintain the fire integrity of the barrier, ensuring that fire does not spread to adjacent compartments.
At ZNB Systems, we offer complete firestopping solutions for all types of electrical penetrations, using certified systems from Marvon, with proven fire resistance of up to EI240, in accordance with EN 1366-3 and EN 13501-2.
Authorised Contractors
Certified by our suppliers for the proper installation of passive fire protection systems.
Frequently Asked Questions
about Cable Penetration Firestops
Yes. In installations where frequent cable changes or modifications are required—such as server rooms, shafts, and technical areas—materials like TECNOBAG firestop pillows and TECNOBRICK insertable foam bricks are used.
These allow easy access without damaging the fire barrier, while providing certified fire resistance when in place.Cable trays carry a large volume of material and require combined firestop solutions.
Depending on the geometry of the opening, the following products are used:
TECNOBAG, for quick and removable sealing,
TECNOBRICK, for adaptable and reusable applications,
and TECNOBOARD, when a permanent seal with high mechanical strength is needed.
In all cases, selection is based on EN 1366-3 certifications and the tray cross-section.In cable bundles or high-density penetrations, the firestop must handle both a high thermal load and multiple ignition points simultaneously.
The most appropriate solution typically involves installing TECNOBOARD as a barrier and applying TECNO-S or TECNOGRAPHIT to fill gaps and ensure sealing.
The final selection depends on the depth of the penetration and the number of cables.Electrical conduits (spirals) are generally treated as flexible pipes with cables.
The recommended method involves using TECNOBOARD for the main firestop and TECNO-S for elastic sealing around the conduit.
Alternatively, when the conduit has a fixed diameter and intumescent action is required, TECNOCOLLAR is applied externally, based on the product’s certifications.Depending on the product and application method, cable penetration firestop solutions offer fire resistance ranging from EI60 to EI240.
The results are based on tests carried out in accordance with the European standard EN 1366-3, on wall and floor assemblies, with specific penetration geometries and configurations.All Marvon penetration firestop systems we apply are certified according to EN 1366-3, with additional testing under EN 13501-2 and, where required, EN 1366-4 for joint sealing.
Technical datasheets and declarations of performance are provided for each product, ensuring full compliance and technical reliability.