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MN003286A01-E
Chapter 3: GTR 8000 Base Radio Installation
Perform electrical installation work in accordance with the current edition of the NFPA 70 and local
building codes. Where required, use a qualified and licensed electrician for all electrical installations.
3.3.8.1
General AC Power Guidelines and Requirements
The Motorola Solutions Standards and Guidelines for Communication Sites manual defines the
guidelines and requirements for cabinets and racks which house equipment that requires AC power
input. Some of the guidelines and requirements are as follows:
•
The cabinet or rack is designed to accept 120/240 V, single-phase power with an amperage service
size as required by the electronic equipment.
•
Cabinets and racks powered by commercial power must be equipped with a Nationally Recognized
Test Laboratory (NRTL) certified power distribution module that contains a main circuit breaker or
individual circuit breakers of the correct size as required for the electronic equipment or as the
customer specified.
•
A decal showing an electrical schematic of the power wiring is affixed to the inside surface of the
cabinet.
•
All AC power equipment and electrical components must conform to National Electrical
Manufacturers Association (NEMA) and National Electrical Code (NEC). The AC power equipment
must also be listed by an NRTL.
•
A surge arrestor, designed to protect equipment systems from a 120/240 V service and load center,
is placed on the power feed ahead of all individual load center circuit breakers. This gapless
arrestor must be listed by an NRTL for the purpose intended.
•
Selection of a surge arrestor is based on the susceptibility of the equipment powered by the
electrical service, with margin provided for locally generated disturbances. See ANSI/IEEE C62.41
(21) for more details.
•
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.
90
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