The Alpha Communications® PK502B multi-
entrance adaptors are used with our PK543A,
PK543, PK292A and PK205 series amplifiers
only. They provide audio intercom and door
release switching for two (2) to eight (8) en-
trances (depending on how many PK502B's
The PK502B adaptors are used in addition to
the system amplifier, and power off of the
same transformer. A plug-in wiring harness
makes installation quick and easy.
You must add one (1) PK502B switching adap-
tor to each entrance, after the first entrance, up
to a maximum of eight (8) entrances (using a
maximum of seven (7) PK502B units).
• Can be used for two (2) to eight (8) entrances
• Operates on Safe Low-Voltage Class II Wiring
• Convenient Plug-In Wiring Harness
• Convenient Surface Mount installation
Rugged ABS White Plastic Casing.
Polarized plug in type wiring harness
Surface mount or mountable to the rear
of specifically designed apartment en-
trance speaker panels.
Rev. 4 - 08/08
ARCHITECTS' AND ENGINEERS'
The multi-entrance adaptor(s) shall be Alpha Com-
munications®/Tektone model PK502B, or approved
equal. Unit(s) shall provide the control and power
circuits needed to switch the audio and door release
functions, to the calling entrance station. Unit(s)
shall be used in addition to standard system ampli-
fier. Low voltage wiring shall be used and a plug-in
wiring harness shall be provided for installation
wiring. The PK502B unit(s) shall be installed adja-
cent to the intercom amplifier.
Contractor shall observe all local and national elec-
trical and building codes.
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42 Central Drive • Farmingdale NY 11735-1202 • Phone (631) 777-5500 • Fax (631) 777-5599
TOLL-FREE 1-800-666-4800 • Web: www.AlphaCommun