Instruction Manual

Table Of Contents
At least one 120 VAC, 15 A duplex convenience outlet equipped with Ground Fault Interrupter (GFI)
protection must be provided in the electronic equipment compartment.
CAUTION: Do not use surge/transient suppressors without careful and expert power system
analysis.
NOTICE: Redundant devices could be terminated on different AC main phases so that a single
phase failure does not result in a power loss for both devices.
3.3.8.2
General Breaker Recommendations
To ensure that a fault which causes the breaker to open does not result in the loss of multiple transmit
channels, each power supply should have its own supply breaker. The breaker recommendations for
AC and DC supply breakers are as follows:
For a 120 VAC, 60 Hz application, the AC supply breaker must be rated for a continuous current of
20 A. For a 220 VAC, 50 Hz application, the AC supply breaker must be rated for a continuous
current of 10 A minimum, not to exceed 20 A.
Individual DC breakers are not used. For information involving the sizing of cables and DC power
distribution, see the Standards and Guidelines for Communication Sites manual.
Site installation must include a single current interrupting device on the DC input distribution (fuse or
circuit breaker) rated for the application loading, not to exceed 200 A. For each standalone device,
the DC supply breaker should be rated for a continuous current of 25 A.
3.3.8.3
General Battery Installation Recommendations
Position the batteries and charger as closely as possible to the rectifier system using the cables. Use a
heavy gauge stranded cable to minimize voltage drop. Examples of the resistance of some heavy
gauge wire are:
Table 33: Heavy Gauge Wire Resistance Examples
Gauge Resistance
#6 gauge 0.3951 /1000 ft
#4 gauge 0.2485 /1000 ft
#2 gauge 0.1563 /1000 ft
The maximum voltage drop can be calculated by knowing the peak current the radio system draws.
Use the following formula:
Total Voltage drop = [Ώ
/1000 ft] x [total loop length (ft)] x [Ipeak (A)] + [connector(s) voltage drop(s)]
See DC Power Connection Wire Gauge Calculations for Integrated Voice and Data on page 102 and
DC Power Connection Wire Gauge Calculations for HPD on page 103 for additional guidelines on the
cable sizing.
3.3.9
General Electrostatic Discharge Recommendations
Electronic components, such as circuit boards and memory modules, can be sensitive to Electrostatic
Discharge (ESD). Use an antistatic wrist strap and a conductive foam pad when installing or upgrading
the system.
MN003286A01-H
Chapter
3: GTR 8000 Base Radio Installation
91