Symmetricom TimeProvider 5000 User Manual page 411

Developing a Grounding Scheme
In addition to determining where to locate and mount the antenna and cabling, you
should develop a grounding scheme. The purpose of the grounding scheme is to
provide some protection against voltage surges and static discharge. If transient
eliminators are used, they also need to be connected to the perimeter ground
system or bulkhead entrance panel that is connected to the perimeter ground
system.
Caution: To ensure proper grounding, observe these precautions
when installing the antenna:
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In general, follow local building codes when selecting a grounding scheme, wire
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size, and installation.
Use #6 AWG (13.3 mm) copper ground wire or larger, depending on the distance
to the earth ground electrode. Refer to your local electrical codes for specific
details. In most cases, 1/0 AWG (55.0 mm) ground wire will maintain 1/10 the
resistance of the coaxial shied..
Note: Larger ground conductors provide better transient elimination;
that is, the larger the ground conductor, the less likely the chance of
transients.
Connect transient eliminators, if part of the grounding scheme, to earth ground
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through a conductor.
Symmetricom makes no recommendation as to whether to install transient
eliminators. Symmetricom can provide suitable transient eliminators as an option.
Note:
inside equipment rack ground. Doing so can defeat the protection
afforded by the transient eliminator.
Never connect antenna systems to the same earth ground connector as heating
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and cooling systems, elevator or pump motors, or other motors or machinery
which can induce noise in the antenna system.
098-00028-003 Revision A – June, 2011
Allow no sharp bends in the ground conductors.
Ensure that no painted surface insulates the transient eliminator or
grounding clamps.
Ensure that ground conductors are bonded to the metal enclosure
box (if used) and do not enter through an access hole.
Do not use soldered connections for grounding purposes.
Secure all grounding connections with mechanical clamp type
connectors.
connect the outside transient eliminator ground to the
Do not
Appendix C Installing the GPS Antenna
Antenna Installation
TimeProvider 5000 User's Guide 411