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A LITTLE HISTORY
Over the last 20 years, the complexity and
sensitivity of electrical distribution systems have changed and
grown substantially. Electronic equipment, such as industrial PLCs,
robotics, computers, and office equipment, use sensitive and
critical microprocessors (chips). In addition, industrial and
commercial facilities are powering energy efficient solid state
lighting, energy management systems, telecommunications, building
support systems, air handling, fire alarm and security systems, HVAC
systems, drives, and more. In all modern power systems, there are
interactions of the electrical equipment throughout a facility. In
years past, these interactions had little consequence. Motors,
incandescent lighting, relays, and resistive heating elements all
used power in essentially the same way with little apparent effect
on each other.
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