standards and guidelines for communication sites - Radio And ...

STANDARDS AND GUIDELINES FOR COMMUNICATION SITES GENERATOR OUTPUT AND DERATING CONSIDERATIONS
• Care shall be taken to ensure that exhaust gas discharged from the exhaust system shall disperse
into the open atmosphere and will not be blown or drawn into the building interior. Proper
precautions shall be taken when generators are installed within or in close proximity to occupied
structures.
• Foundation size shall be determined based on the geographic area where the system is being
installed.
• Door sizes, as existing in the finished structure, shall be considered to allow removal/replacement
of the largest generator subassembly from within the structure.
• Rain hoods over intake and exhausting vents shall be designed to accommodate local extreme
environments. Where the potential of high snowfall or drifting is possible, the vent hood shall be
placed at an appropriate level and directed away from the elements.
NOTE: On radiator cooled generators, cooling air inlet shall be at least 1½ times larger than radiator duct
receptacle area. Flow of cooling air and heated air should be controlled by automatically operated
louvers.
• Earthquake prone areas (Moment Magnitude rating 3 or greater) may require special design and
installation features, especially in the area of fuel lines, fuel storage, exhaust system and muffler
supports. Appropriate geological information should be consulted regarding seismic
considerations.
• For indoor installations, ensure that maximum floor loading will not be exceeded. Shock mounts
are recommended and may be required on some installations to minimize vibration transfer.
• Batteries not required for operation of the generator shall not be located within a room containing a
generator unless the room is properly ventilated.
• Manufacturer's guidelines and specifications to ensure proper air exchange for the generator room
shall be followed.
6.9.6 ALARMS, METERS AND GAUGES
NOTE: Consideration shall be given to assure that remote alarm reporting systems are independent of the
power systems they monitor. The reporting system shall be such that if the phone line breaks, the
primary power source fails, or the common battery bank depletes, then alarms will still be transported.
• All generators shall be equipped with an engine high temperature alarm/shutdown and low oil
pressure alarm/shutdown.
• All generators shall be equipped with an oil pressure gauge.
• Frequency, Voltage and Amp meters are also recommended and should be installed either at the
generator control panel or at the transfer switch.
• Additional meter, gauge, remote alarm, engine and battery heater options and needs shall be
considered. These alarms, if monitored, can provide an early warning to impending problems,
thereby reducing cost and down time significantly.
68P81089E50-B 9/1/05 6-41