Aiphone NEM-20 - Wiring; Wiring Distance

3 WIRING -
■ Wiring diagram
NA-T/A when attached
to a standard open voice
sub (any).
■ NEM Lamp Memory Intercom
NEM or NEM-A is a master-selective open voice press-to-talk or handset voice-actuation system.
NA-T/A adds handset capability to an open voice sub, providing private communication.
■ Cable
Use a multi-conductor (non-twisted) cable 22AWG-18AWG, including 2 extension wires to standard sub
attatched to each NA-T/A.
■ With the jumper between terminals 3 & 4, a single NA-T/A can receive a pre-tone and voice transmission from
the master station. Full two-way communication requires the use of the handset. When an NA-A or NB-L
substation is used in conjunction with the NA-T/A as shown above, two-way open voice communication is
possible. Lifting the handset disables the open voice sub station, allowing 2-way communication between the
master and the NA-T/A.
Note 1; The jumper between the NA-T/A terminals 3 & 4 should be removed if used in conjunction with a
standard substation, or distortion may result.
Note 2; If background music is to be distributed through the system, the NA-T/A must be used in conjunction
with a standard substation or distortion may result.
■ Wiring distance
• Select the proper wire gauge from the chart below to meet your requirements.
AWG
22AWG
20AWG
18 AWG
Distance
420'
650'
1000'
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