Intercom I400 for Tunnels

• Intercom I400 for tunnels, does not need APBX, according to international safety rules serves as alternate communication system for tunnels in a hard rock mine, at the same time to communicate underground chamber refuge because it can be energized from the outside with a central source of 48 VCD with backup battery for 24 hours, in case of emergency can be connected 4 vehicle 12V batteries in series, connecting positive + with negative – to energize to 48 VDC.
• It consists of 2 to 50 intercoms powered by a 48VDC source, operating up to 15km for a single pair of 18 AWG (0.9mm2) telephone wires.
•  It is configured for group calls between the various areas of the mine, and under request supports general call which can terminate all active calls.
• The devices responds to pulse dialing using two digits 00 to 99 for each phone number, no special code is required.

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