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NV10/NV7.5 Operations and Maintenance Manual
Issue 3.4 2016-08-03
Page xvii
Marking Hazards
Place warning signs close to any hazardous areas or systems (e.g., the feedline or the antenna
system). Make the signs large enough that they cannot be missed. Provide signage in all
languages used in the region. These signs are intended not only for authorized personnel, but
also for emergency responders or accidental trespassers.
Qualifying Site Personnel
Make sure that personnel who have access to the site are qualified to work around electronics
and high voltage systems.
Ac Power Protection
You should take steps to protect equipment from surges (over-voltage spikes) on the ac power
lines. Surges may occur during thunderstorms, or because of malfunctions in the electrical
distribution grid. Surge suppressors and ac power conditioners can prevent serious damage to
your on-site equipment, including the transmitter.
RF Protection
Transmitters and their antenna systems create intense radio frequency fields at the transmitter
site, particularly near the feedline, antenna and tower. At some sites, these fields may cause
biological effects, including the heating of body tissues. Intense fields can also create dangerous
high voltages on ungrounded, conductive surfaces and objects. At certain points where high
voltage conductors come close to grounded conductors (e.g., at feedline junctions or on the
tower), dangerous electrical arcing or overs can occur. It is very important that you take the
following steps to prevent damage to equipment or personnel due to RF fields:
• Use safety interlocks to de-energize transmitters if personnel open doors or panels
accessing high field areas
• Place warning signs in any locations where high fields can occur
• Train personnel about the short-term and long-term hazards of RF radiation
• Use personal RF monitors to alert personnel when hazardous RF radiation levels are
present
• Physically block access to the area around the antenna system, feedline and tower
• Ground all exposed conductive surfaces or objects in high field areas
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