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How to cable a 2Voice 2 wire audio system with 1 entrance, 1 button calling 1 handset

This article will show you the type of cable and the cable distances required for installing a 2Voice 2 wire audio system with 1 entrance, 1 button calling 1 handset. Also see below schematic diagram, downloads for 1 button calling 2, 3 or 4 handsets.

Examples below show fail secure and fail safe lock release options.