Tunneling

Cables used in tunneling must meet special requirements due to the environmental conditions and potential risks present in that environment. Here are the main characteristics of these cables.

Fire resistance: Tunnel cables typically have high fire resistance to prevent fire spread and ensure safety in emergencies. These cables are designed to maintain structural integrity and electrical function for a specific time in the presence of fire.

Low smoke and corrosive gas emissions: In case of fire, tunnel cables must emit low amounts of smoke and corrosive gases to ensure safe evacuation of people and protection of sensitive equipment. Special insulation and jacketing materials, such as Low Smoke Zero Halogen (LSZH) compounds, are used to minimize the emission of smoke and toxic gases.

Moisture and humidity resistance: Cables for tunneling may be exposed to moisture, water, and condensation. Therefore, they must have insulation and jackets that are moisture-resistant and prevent water ingress to avoid short circuits and ensure reliable performance.

Mechanical protection: Cables in tunnels may be exposed to adverse mechanical conditions, such as vibrations, impacts, and tension. Therefore, they may feature additional protection, such as metallic armor, outer jackets, or reinforcements, to withstand mechanical stresses and ensure durability.

Compliance with regulations: Tunnel cables must comply with specific regulations and standards depending on the location and type of tunnel. These regulations may include safety requirements, fire resistance, smoke and gas emissions, among others. Some common standards are IEC 60332 for fire resistance and EN 50267 for low smoke emission.