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Electrical Hazards Awareness

  • Climbers must maintain MAD at all times.
    December 1, 2025

    Aerial Lifts, Electrical Hazards and the Revised Z133

    By Peter Gerstenberger

    We went through the upcoming revision of the ANSI Z133 Safety Standard, pulling out and listing here in sequential order all the relevant parts that affect lift operations near conductors. These apply to conventional truck-mounted lifts as well as “boom-supported [...]

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  • Class E helmets provide only a measure of protection
    December 1, 2025

    Electrical Hazards for Aerial-Lift Operations

    By John Ball, Ph.D., BCMA, CTSP

    Electrical hazards to tree workers are, for the most part, within the realm of those who access tree canopies. True, we do have electrocutions and electric-shock injuries among ground workers, but they are the minority. Tree canopies and electric supply [...]

    read more
  • Arborists are exposed to many hazards, from passing traffic to operating at heights.
    June 1, 2024

    Part 8, Chapter 6: Safety Standards

    By John Ball, Ph.D., BCMA, CTSP

    Arborists work within an array of regulations, standards and policies. The foundation for these is the federal Occupational Safety and Health (OSH) Act of 1970. This Act mandated that workers have a safe and healthy workplace environment. There are two [...]

    read more
  • Class E helmets provide only a measure of protection.
    April 1, 2024

    Part 6: Work Practices Near an Electrical Hazard

    By John Ball, Ph.D., BCMA, CTSP

    Part 1 of Chapter 4, Safe Work Practices (TCI Magazine, March 2024), covered the job hazard analysis (JHA), work plan and job briefing. This article, Part 2 of Chapter 4, Safe Work Practices, focuses on arboricultural operations near overhead power [...]

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  • Conducting a job briefing
    March 15, 2024

    EHAP Revision Series, Part 5: Work Practices Near Utility Conductors: Different Categories of Tree Workers

    By John Ball, Ph.D., BCMA, CTSP

      Note: The following article includes the proposed changes to “Section 3, Electrical Hazard” of the ANSI Z133 safety standard. This next Z edition will be published during 2024, and these “Electrical Level” categories will be subject to change. Conducting [...]

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