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Full Description

Scope

The scope of this document is to provide concensus of the expertize on the subject of grounding of industrial and commercial power systems, equipemnt, lightning protection, connection to earth and computer system grounding.

Purpose

As grounding systems technology advances, this recommended practice must be revised and updated to reflect these changes.

Abstract

Revision Standard - Inactive-Reserved. The problems of system grounding, that is, connection to ground of neutral, of the corner of the delta, or of the midtap of one phase, are covered. The advantages and disadvantages of grounded vs. ungrounded systems are discussed. Information is given on how to ground the system, where the system should be grounded, and how to select equipment for the ground of the neutral circuits. Connecting the frames and enclosures of electric apparatus, such as motors, switchgear, transformers, buses, cables, conduits, building frames, and portable equipment, to a ground system is addressed. The fundamentals of making the interconnection of a ground conductor system between electric equipment and the ground rods, water pipes, etc., are outlined. The problems of static electricity¿¿¿ how it is generated, what processes may produce it, how it is measured, and what should be done to prevent its generation or to drain the static charges to earth to prevent sparking¿¿¿are treated. Methods of protecting structures against the effects of lightning are also covered. Obtaining a low-resistance connection to earth, use of ground rods, connections to water pipes, etc., are discussed. A separate chapter on electronic equipment is included.
 

Document History

  1. IEEE 142-2007

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    IEEE Recommended Practice for Grounding of Industrial and Commercial Power Systems

    • Most Recent
  2. IEEE 142-1991


    IEEE Recommended Practice for Grounding of Industrial and Commercial Power Systems

    • Historical Version
  3. IEEE 142-1982


    IEEE Recommended Practice for Grounding of Industrial and Commercial Power Systems (IEEE Green Book)

    • Historical Version
  4. IEEE 142-1956


    IEEE Grounding of Industrial Power Systems

    • Historical Version