Design to generally withstand flames and particularly when they are generated by an HTB cable breakdown or a peripheral fire in a technical room such as an HTB cable tunnel, screens have obtained the best possible grading in terms of reaction to fire according to the EN ISO 13501-6 Euroclass, with Aca (noncombustible), s1 (no smoke generation), d0 (no generation of flaming droplets); that is to say an M0 grading according to the NF P92-507 French standard.

These screens’ fire performance can entirely be compared to noncombustible materials like steel, rock, glass, concrete, plaster while being much lighter (< 5 kg/m2) and mechanically resistant to breakdowns.

Thanks to the use of 100% mineral materials, that are also non-conducting, and thanks to their geometry, the IVV MINERAL PROTECT® anti-common mode screens provide unprecedented mechanical and dielectric protection while allowing cables to dissipate heat energy with natural ventilation.

FOCUS ON THE IVV MINERAL PROTECT® TECHNOLOGY

PATENTED BY COMMET GROUP

Besides its capacity to slow down a high-voltage cable’s combustion, the IVV MINERAL PROTECT® material protects the other phases and other HTB underground lines in confined spaces such as underground tunnels. Developed by COMMET Group, the IVV MINERAL PROTECT® technology is the result of an environmentally friendly ecodesign process, as much in manufacturing processes as in the materials used: maximum decrease of the carbon footprint during production; no commonly used hydrocarbon-based resin; total recyclability of the 100% mineral materials used; and no use of products that could lead to the emission of hazardous gases, particularly in closed environments like tunnels.

The Gross Calorific Value (GCV) tests conducted in a COFRAC fire testing laboratory have shown that the IVV MINERAL PROTECT® technology benefit from better fire performance than noncombustible materials used in the construction of buildings.

SOLUTIONS THAT CAN BE ADAPTED TO BOTH TUNNELS AND RISERS

The COMMET GROUP range of IVV MINERAL PROTECT® screens can both be used in the linear parts of underground line tunnels as in more complicated parts at the entrance or exit of tunnels (trifurcation).

The variable or fixed size U-shaped cowls are generally more suitable for the ends of tunnels or in linear pathways with wall interruptions (ventilation rack, air shaft,...)

In the case of a tunnel entrance or exit with crossing cables or trifurcations, retractable cowls are available in COMMET’s catalog.

These can also be recommended for the protection of sensitive or hazard areas such as junction areas in tunnels.

AN INTERNAL RESEARCH DEPARTMENT

COMMET GROUP has an in-house engineering department at your disposal for the design of bespoke IVV MINERAL PROTECT® screens, according to your needs:

• Tilt in accordance with the wall’s verticality or with mounting brackets, centre distance
• Span, requested load
• Adaptation to existing equipment
• “L” or tablet shaped
• and so on