ABSTRACT
Since distribution systems account for up to 90% of all customer reliability prob-
lems, improving distribution reliability is the key to improving customer
reliability. To make effective improvements, a basic understanding of distribu-
tion system functions, subsystems, equipment, and operation is required. This
chapter presents fundamental concepts, terminology, and symbology that serve
as a foundation of knowledge for reliability-specific topics. Careful reading will
magnify the clarity and utility of the rest of this book.
