Quantcast Electromagnetic Interference (EMI)

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the system with consideration of 5 percent of sensors in the alarm mode.
Criteria for configuration of power supply includes:  load requirement,
critical load and expansion; continuous or intermittent outputs; protection
time limits; distribution networks and attendant line losses; national and
local electrical code requirements; and other criteria developed by NAVFAC
DM-4.3, Electrical Engineering, Switchgear and Relaying.  Electromagnetic Interference (EMI).  Interference can be introduced
to unprotected IDS communication lines that are in close proximity to high
voltage power distribution networks, large transformers, unsuppressed
electric motors, and other communication techniques and systems.  Protection
from EMI/EMR includes avoiding the sources of the interference and shielding
wire lines by means of specialty wiring (coax, foil shielded pairs, and
metal sheathed cables), metallic conduit systems, and physical separation of
power and signal systems.  Criteria for EMI/EMR protection for wire
communications is contained in NAVFAC DM-4.07, Electrical Engineering, Wire
Communication and Signal Systems.  Lightning and Static.  Destructive power surges from lightning and
static can affect the complex IDS network of electrical conductors and
electronic terminal devices (both detectors/sensors and control equipment).
Safeguards from lightning, static, and power line transients should be
initiated.  NAVFAC DM-4.06, Electrical Engineering, Lightning and Cathodic
Protection, develops the criteria for this subject.  Other Environmental Considerations.  The IDS components and
networks are influenced by many factors which affect the performance of the
system.  Care and protection of devices and wiring will involve periodic
maintenance and possibly some esoteric protection measures.  Examples of
environmental influences include hurricane, rain, thunderstorm, snow,
sleet, tornadoes, high wind and other severe weather; smoke, dust, sand,
humidity, floods, high and low temperature, salt fog; and radiological
exposure incidents.  There are many factors that may affect the system, and
the variables should be examined in order to implement the system in the
most cost-effective manner for the Government.


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