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JOHN BALL

  • 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 [...]

    read more
  • Spool insulators
    January 4, 2024

    EHAP Revision Series, Part 2: Switching Devices, Support and Other Utility Hardware

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

    This is a continuation of the discussion of the electrical-system equipment found along distribution lines. One of the requirements for arborists working in proximity to an electrical hazard – within 10 feet of the lines – is familiarity with [...]

    read more
  • 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
  • April 1, 2023

    Tree-Work Safety by the Numbers

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

    Mathematics is not a field that sparks much interest among tree workers – or people in general. But the field of probability plays a role in just about everything tree workers do. If you knew that the odds of being [...]

    read more
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