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(b) Short-circuit and coordination studies, which should be updated to reflect changes
in: supply capacity, transformer size or impedance, conductor size, operating conditions and
additions of motors, and most importantly, changes to any protective devices or settings.
(c) Circuit routing diagrams or raceway layouts.
(d) Plot plans or equipment location plans.
(e) Schematic diagrams or elementary wiring diagrams.
(f) Connection wiring diagrams.
System diagrams are generally needed to complete the data being assembled. For a large
building complex, system diagrams for the lighting, ventilation, heating and air conditioning, and
control and monitoring systems are examples of system diagrams that may be required. Section
4, System Planning Studies, provides a more thorough discussion of the collection and evaluation
of electrical system data. Emergency Procedures. The survey process also includes the acquisition or
preparation of emergency procedures. Emergency procedures should list, step by step, the action
to be taken in the event of an emergency. These should include procedures for the safe shutdown
or start-up of equipment and systems. Optimum use of these procedures is made when they are
bound for quick reference and located in the area of the equipment or systems. Also included in
the survey process, are the acquisition and maintenance procedures for proper test and
maintenance of equipment. The use of well maintained safety equipment is essential and should
be mandatory when working on or near live electrical equipment. Portable lighting is often
necessary, particularly in emergency situations involving the plant electrical supply. Portable
meters and instruments are necessary for testing and troubleshooting, especially on circuits of
600 V or less. The size of the plant, the nature of its operations, and the extent of the
maintenance and repair program are all factors that determine the frequency and use of test and
maintenance equipment. Specialized equipment may often be rented or shared between nearby
facilities. Identification of Critical Equipment. Equipment is considered critical if its failure
to operate normally and under complete control will cause a serious threat to personnel, property,
or the product. Electrical power (i.e., process steam, air, water, etc.) may be essential to the
operation of a machine, however, unless the loss of one or more of these supplies causes the
machine to become hazardous to personnel, property, or product, the machine may not be
considered critical. The combined knowledge and experience of several people may be needed to
determine the criticality of a machine. An entire system may be critical by its very nature.
Examples of critical systems are:


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