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Summary

This 54-minute DVD explains principles and practices for working safely on de-energized transmission lines. It explains how a de-energized line could become energized if the proper safety practices are not followed. An approach to de-energizing, isolating, testing, and grounding a transmission line is presented. Describes or demonstrates how to use temporary grounds and personal grounds.

• De-Energizing, Isolating, and Tagging – 10 minutes
  Describes the general procedures for de-energizing, isolating, and tagging a transmission line.
• Induced Charges – 9 minutes
  Describes how a de-energized line can become energized by magnetic or electric induction.
  
• Static Charges and Ground Systems – 9 minutes
  Describes how a de-energized line can become energized by static electricity. Describes three transmission grounding systems. Describes how grounding minimizes the dangers of induced and static charges. Describes how charges may continue to be present on a line at locations other than the point of grounding.
  
• Field Clearance and Testing – 8 minutes
  Describes the general procedures for obtaining a clearance on a transmission line. Describes how to test a transmission line to determine that it is de-energized.
  
• Grounding – 8 minutes
  Explains why it is necessary to ground a de-energized transmission line. Describes how to safely ground a transmission line.
• Returning a Line to Normal – 10 minutes
  Describes how to safely remove grounds from a transmission line. Describes the general procedure for releasing a clearance. Describes the general procedure for switching a line back into service.

Support Materials Available

Student workbook, instructor guide.