IEEE 141-1993

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1.1 Scope and general informationThis publication provides a recommended practice for the electrical design of industrial facilities.It is likely to be of greatest value to the power-oriented engineer with limited industrialplant experience. It can also be an aid to all engineers responsible for the electrical design ofindustrial facilities. However, it is not intended as a replacement for the many excellent engineeringtexts and handbooks commonly in use, nor is it detailed enough to be a design manual.It should be considered a guide and general reference on electrical design for industrialplants and buildings.Tables, charts, and other information that have been extracted from codes, standards, andother technical literature are included in this publication. Their inclusion is for illustrativepurposes; where technical accuracy is important, the latest version of the referenced documentshould be consulted to assure use of complete, up-to-date, and accurate information.It is important to establish, at the outset, the terms describing voltage classiÞcations. Table1-1, adapted from IEEE Std 100-1992 [B5],1indicates these voltage levels. The NationalElectrical Code, described in 1.5.1, uses the termover 600 voltsgenerally to refer to what isknown ashigh voltage. Many IEEE Power Engineering Society (PES) standards use the termhigh voltageto refer to any voltage higher than 1000. All nominal voltages are expressed interms of root-mean-square (rms). For a detailed explanation of voltage terms, see Chapter 3.ANSI C84.1-1977 [B1] lists voltage class designations applicable to industrial and commercialbuildings where medium voltage extends from 1000 V to 69 kV nominal.1.2 Industrial plantsThe termindustrial plants,as used in this chapter, refers to industrial plants, buildings, andcomplexes where manufacturing, industrial production, research, and development are performed.It does not include commercial buildings, such as institutional, governmental, public,health-related ofÞce buildings, nor apartment and residential buildings.If commercial buildings are included in industrial complexes, then the use of IEEE Std 241-1990 (the Gray Book) would be appropriate for these speciÞc buildings. If medical facilities1.2 Industrial plantsThe termindustrial plants,as used in this chapter, refers to industrial plants, buildings, andcomplexes where manufacturing, industrial production, research, and development are performed.It does not include commercial buildings, such as institutional, governmental, public,health-related ofÞce buildings, nor apartment and residential buildings.If commercial buildings are included in industrial complexes, then the use of IEEE Std 241-1990 (the Gray Book) would be appropriate for these speciÞc buildings. If medical facilities