The infrastructures affected included:

• Client’s medium-voltage infrastructures, from a 15 kV MV loop at the SET Monrepós substation.
• Emergency power supply with generators and UPS.
• General electrical infrastructures: fuse and distribution boxes, earth networks, cable ducting and conductors.
• Ordinary lighting inside tunnel, evacuation gallery, connecting galleries and shaft heads.
• Evacuation and emergency lighting
• Power supply for ventilation system and associated control system (anemometers, opacimeters and gas sensors).

• Power supply for fire detection and extinguishing system (detecting fires in tunnel, alarm control centre, fire extinguishers, hydrant network, pumping system and water supply).
• Power supply for communications, signage, safety, security and control systems (radiating cable, public address system, SOS posts, variable information panels, cross-arrow systems, etc.).
• Ancillary electrical installations in connecting galleries.
• Ancillary electrical installations in technical rooms and control building.