Natural disasters of past years emphasize that the design and installation of structures and systems should be such that the damage is kept to a minimum when a disaster occurs. Even though having been damaged to some degree, it is important that the continuity of service for critical systems be maintained until it is safe to shut the systems down. Figure #l is an Earthquake Seismic Zone Map of the United States. Figure #2 is Wind Velocity Map for the United States.
It is extremely desirable that the circuit integrity of communication, instrumentation, lighting, power and safety circuits be maintained when critical conditions exist. This is especially true for process and utility facilities where there may be the potential for human safety problems, facility safety problems, adjacent facilities safety problems and pollution problems

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