Rev. 5 - 05/09
ARCHITECTS' AND ENGINEERS'
The amplifier/power supply unit(s) shall be Alpha
Communications®/S.T.R.™ model (NH201TT-2,
NH209TT-2) or equivalent. Power supply unit(s)
shall operate from a U.L. Listed transformer (SS106
or SS146 for NH201TT-2 or T1240 for NH209TT-
2). All wiring to power supply/amplifier shall be low-
voltage Class II wiring, installed as per all federal,
state, and local electrical codes.
Power supply/amplifier shall be designed to mount
directly into the 'TT' or 'TTM' series lobby entry
panel stations. Power supply/amplifier shall contain
the system amplifier, power supply, speaker and
microphone, all in one 'snap-in' assembly. Unit shall
snap onto the panel front speaker/microphone grille.
Power supply/amplifier shall provide the intercom
amplification and signalling power for the proper
system operation. Power supply/amplifier shall be
installed a safe distance from any source of electrical
Contractor shall observe all local and national electri-
cal and building codes.
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NH201TT-2 / NH209TT-2
Amplifier / Power Supplies
These Alpha Communications®/S.T.R.™ 'NH' series power
supplies are used with the HT2001 and HT3009/HT2009
series handset stations to provide intercom amplification
and power to operate the associated intercom system, and
certain optional components and/or accessories, such as
electric door opener(s) etc.
The NH201TT-2 powers from a 16VAC (30VA) and the
NH209TT-2 powers from a 12VAC (40VA) low-voltage
Class II transformer.
These NH201TT-2 and NH209TT-2 power supplies are
designed to easily mount right onto the plastic speaker/
microphone grille in the 'TT' and 'TTM' series lobby entry
The NH201TT-2 power supply is used with the HT2001
series 3-wire apt.