The ERCOTUNNEL® system allows the installation of emergency telephones in sequence during the tunnel excavation.

The module consists of an ERCOTEL® series telephone mounted on a stainless steel plate equipped with a wall-mounting system. On the plate there is also a junction box with two IP66 watertight multipolar waterproof connectors. The box is designed to allow easy connection of the multipolar extension cable to the next module. In its basic version, a 20-pair telephone cable is provided.

The system therefore allows to follow the excavation front by adding the telephones at each completion of a new section.