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Electrical Hazards Awareness

  • 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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  • aerial-device operator makes direct contact with conductors
    February 15, 2024

    EHAP Revision, Part 4,Chapter 3: Recognizing Electrical Hazards

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

    Exposure to electric current is one of the many hazard sources during arboricultural operations. But electricity is one of the most unforgiving of these sources. A review of utility data shows that one in four contacts that resulted in [...]

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  • transformer
    December 1, 2023

    EHAP Revision, Chapter 2, Part 1: Electrical Hardware Recognition: Voltage-Management and Protective Devices

    By John Ball, Ph.D., BCMA, CTSP, A-NREMT

      Basic terminology and how the electric-power system works from generation to the end consumer was covered in Part 1 of this series (TCI Magazine, October 2023). This article will focus on the distribution system. Trees are often near these [...]

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  • Voltage generated at the power plant
    November 1, 2023

    Electricity and the Utility Industry

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

    Photo 1: If we transmitted the electricity at the voltage generated at the power plant, the voltage has the force to move only tens of miles. Transformers are used to step up the voltage so it can be moved [...]

    read more
  • June 1, 2023

    Incidental Line Clearance: What Arborists Need to Know About Working Around Electric Utilities

    By Geoff Kempter and Stephen Hilbert

    Electricity is the only product that is consumed the moment it is created, from the point of generation to end users, through a complex grid of towers, poles, wires and various types of hardware. The vast majority of the grid [...]

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