Rev. 6 - 12/08
ARCHITECTS' AND ENGINEERS'
The visitor intercom station(s) shall be Alpha Communica-
tions® model TW202BK(Black) or TW202LA (Light Ash)
or approved equal. The handset shall have an armor cord and
shall have a high-sensitivity receiver and dynamic micro-
phone, for excellent voice fidelity. Communication shall be
full duplex type, activated by lifting the handset off of its
cradle switch. Positive screw terminals shall be provided, and
required wiring shall be only three (3) common wires from
each handset to the NH908A power supply. Cradle switch
shall be chrome plated solid metal type. Plastic cradle
switches shall not be acceptable. Contractor shall supply
tamper-resistant screws and mounting hardware as required.
Handsets shall be flush (or surface) mounted over the
appropriate electrical back box. Contractor shall provide a
model NH908A power supply and SS106 transformer for
each system (and optional IH151N equipment cabinet).
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Visitor Intercom Station
The Alpha Communications® TW202 series intercom stations
are designed specifically for 2-way communications through a
wall (or window), in applications such as prisons. Made from
a heavy-duty armor cord intercom handset, solid chrome finish
metal hook switch and .024" thick solid stainless steel mounting
plate, these stations are made to last. A high sensitivity receiver
and dynamic microphone assures crisp-clear voice communica-
The TW202 can be mounted flush on a standard 2-gang electrical
back box, or it can be surface mounted on a standard 2-gang metal-
mold or equivalent surface back box.
Positive screw terminals make these stations easy to wire.
Stations are available with Black Handset (model