GAI-Tronics 700 Series 24 V DC Page/Party Systems - Manual (Page 2)

Pub. 42004-140E
Installation of GAI-Tronics 700 Series 24 V DC Page/Party
®
Systems Page 2 of 13
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08/13
Power Source Considerations
WARNING
NEVER connect 24 V dc Page/Party ® equipment to a supply voltage in excess of 28.8 V dc or
equipment damage may result.
The GAI-Tronics 24 V dc Page/Party ® system equipment is designed to operate from a 24 V dc
rechargeable battery. A battery charger may be connected to the battery to maintain the charge.
CAUTION
Under no condition should this equipment be operated from a battery charger without the batteries
connected. Most chargers have an unloaded output of 35 to 45 volts, which can damage equipment
designed for nominal 24 volts.
Ground the negative side of the battery system at only one point to ensure hum and noise-free operation.
In planning a GAI-Tronics Page/Party
® system using 24 V dc stations, careful consideration must be
given to power cable losses. In order to use the same cable as used in 120 V ac systems, the installer is
restricted to cable length and the number of units connected in parallel for dc power on one cable.
All units are wired in parallel. Good planning will minimize the cable required for each installation.
GAI-Tronics can supply multi-conductor cable designed especially for this application. Additionally, for
ease of installation GAI-Tronics cable is color-coded to match the termination points in our enclosures.
The number, size and color-coding of conductors are listed in the accompanying system connection
diagrams.
When installing an add-on station, consult the 24 V dc system layout diagrams at the end of this manual.
These figures, when used in conjunction with the station installation information and cable layout guide,
should provide all the information necessary to install additional Page/Party
 stations.
In 24-volt systems, plan on several branch lines from the dc source with no more than six stations per
branch. One branch could span up to 4,000 feet for a single station. The Maximum Cable Distance Table
lists the limits. Where two or more stations are listed, the assumption is that they are evenly spaced along
the cable.
Each amplifier contains two fuses on the PCBA in the 24 V dc input to protect and isolate the handset and
speaker amplifier circuitry in the event of a failure. Power line wiring to each amplifier or group of
amplifiers should have a fuse or circuit-breaker to protect against wiring failures.
If cable with No. 14 AWG power line conductors is used, a 15-amp fuse or circuit breaker should be
installed for each branch line at the point it connects to the battery. Fuse or circuit breaker rating is
determined by the size cable used in the branch. Consult the National Electrical Code (NFPA70) or
Canadian Standards Association (CSA 22.1) for the maximum allowable capacity of the wire used.