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Medium Voltage Systems and Products
by Chuck Mello
Not so many years ago (about 30), electrical power distribution equipment rated over 600 volts was generally found only in two places, utility systems and large industrial facilities. In utility systems, the power system is owned and operated by the utility. This system consists of generation from some remote location, high voltage transmission lines, and high voltage distribution lines that end at a transformer, serving premises wiring at a utilization voltage less than 600 volts. Large industrial plants, such as refineries, chemical plants, pulp and paper mills, and steel mills demand large amounts of power to operate. To get this power distributed around the plant economically, distribution voltages are typically over 600 volts. There are some exceptions to the above applications, but these are very few.
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Field electrical inspectors may be asked to inspect medium voltage installations in the course of their duties, but some may feel unqualified or overwhelmed at the thought of inspecting these installations because their work experience has been more residential and commercial construction, and they have little or no medium voltage experience. This article will be useful as a start to the education process. It is not comprehensive but rather a guide to assist those who may be new to inspecting medium voltage installations up to 15,000 volts.
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