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MSF
5000
Instruction Manual
Chapter
3
Installation
AC
Source
Preinstallation
All
stations must have
a
separate
power circuit from
the
120
or
220
Vac,
50
or
60
Hz
power
source.
The circuit current rating is determined by
the
number of
power supplies contained in
the station.
This circuit must
be capable
of
15-ampere
(minimum) per power supply for low power stations and
20-ampere
(minimum)
for
high power
stations.
Use
High
Magnetic
(HM)
circuit breakers
to
prevent unnecessary tripping. The
power lines should
be
installed in accordance
with
local electrical codes.
Site Grounding
and
Lightning Protection
Antennas
68P81092E03
3/19/94
A
major consideration when designing
a
communications site is the ground and
lightning
protection system.
While
proper grounding techniques and
lightning
protection
are
closely related,
the general
category of site grounding may
be
divided
as follows:
O
Electrical Ground
-
Ground wires carrying electrical current from circuitry
or equipment at the site. Examples are
AC
or
DC
electrical power used
as
the
power
source for equipment at the site, telephone lines,
and wires or
cables connected to alarms or sensors at the site.
A
substantial earth ground
must
be as close to,
and in
as
straight a line,
as
possible
with
the
ground
terminal on
the
Junction
Box.
CAUT
ON
Do not consider
the electrical outlet box as a
substantial ground. Install
a separate,
sturdy ground.
O
RFGround
-
Pertains to the transmission of radio frequency energy to earth
ground. Example is shielding to prevent (or at least minimize) the leakage of
unwanted
RF
transmission from communications equipment and cables.
0
Lighting
Ground
-
The supply of
adequate
lightning
protection is critical to
a safe
communications
site. Telephone
lines,
RF
transmission cables, and
AC
and
DC
power lines must
be protected to
prevent
lightning energy
from
entering
the site
building.
Refer
to the Motorola
Quality
Standards
FNE
Installation Manual R56 for detailed
information on site grounding techniques and lightning protection.
Antennas and transmission lines
are
not part of
the station.
Refer to the
instructions shipped
with
the antenna for
installation instructions and other
applicable information.
3-3
CAUTION
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