The degree of danger in the atmosphere of a hazardous location
needs to be determined prior to selecting an acceptable electrical
equipment installation. If maximum safety is the predominant factor
in determining the type of electrical installations, the cost of
electrical equipment will be extremely high. If low cost of
electrical installation is the predominant factor, safety to
personnel and equipment may be unacceptably low. It is, therefore,
necessary to find a point of balance at which the cost and safety
requirements are both satisfied and acceptable.
The intent of this book is to provide an in-depth understanding
of the factors that influence the classification of a hazardous
location. One factor, in combination with one or more other
factors, will have an impact on the level of danger and its
hazardous boundaries. These factors and their influences are
explained in detail, and once their impact is understood, the
classification of a hazardous location becomes a straightforward
procedure.
The intent of the classification of a hazardous location is to
provide safety for personnel and equipment. The intent is also to
achieve an economical electrical installation which will provide an
acceptable level of safety for personnel and equipment at the
lowest possible cost. To accomplish this, it is necessary to
analyze in detail the environmental conditions of the location and
the characteristics of the source of hazard. The engineer who is
involved in preparing the area classification must understand all
of the details which will have an impact on his decision to
classify the area Division 1, Division 2, or Non-hazardous. Without
the knowledge of the environmental conditions,and the
characteristics of the source of hazard, he most certainly will
give the location a safety level much too high, which is not
economically justified, or a level too low, which is unsafe. This
approach must be avoided.
In nine out of ten cases, a hazardous location is classified
much too conservatively. The reason for this conservative approach
is a lack of knowledge and a misunderstanding of the actual concept
of safety and danger.
The application of the information in this book is mainly for
flammable liquids, vapors, and gases that are processed, handled,
stored, and/or transferred.
General
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