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distribution panels themselves, and any transformers located
between the primary electrical distribution panels and the
secondary electrical distribution panels.
The main switchgears and the motor control centers are steel
cabinets which are attached to concrete pedestals using nuts that
are tightened onto bolts extending out of the pedestals.
Transformers have a construction similar to that of the
switchgears and the motor control centers and are either attached
to concrete pedestals in a manner similar to the switchgears and
the motor control centers or suspended from the overhead
structural framework of the hospital buildings using threaded rod
hangers. Screws or bolts attach the electrical panels to the
walls of the buildings.
The main panel and the main motor control centers range in
size from 91.5 inches high by 40 inches wide by 20 inches deep up
to 91.5 inches high by 60 inches wide by 20 inches deep. The
main panel is equal to or larger in size than the motor control
centers. The conduit from the main transformer to the main
switchboard is 42 inches underground and encased in a concrete
envelope.
The components of the primary and secondary electrical
systems are similar in nature, although they vary in size and
complexity depending on the various electrical loads carried by
them. Those components are installed during the construction
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Last modified: May 25, 2011