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  • On-demand Webinar

2021 Update: Machine Supply Circuit and Disconnecting Means

Learn about the revised requirements to machine supply circuit and disconnecting means in chapter five of the 2021 edition of the National Fire Protection Association (NFPA) 79.

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In the 2021 edition of the National Fire Protection Association (NFPA) 79, the requirements for the machine supply circuit and disconnecting means per chapter five have been revised and restructured. This webinar will discuss the revised requirements to help you navigate its complexities. The first part of the webinar will focus on the core requirements for the machine supply circuit conductors and disconnecting means. This will include:

  • The definition of machine supply circuit
  • Separation and termination of conductor
  • Back-fed terminations
  • Wire bending space
  • Protection of line side live parts
  • Requirements for the machine supply circuit disconnect means, such as marking, location, type, operating handle and excepted circuits

The webinar will also cover the requirements for additional disconnecting means, such as types, operating means and enclosure access. Finally, the webinar will conclude with the requirements for means of removal of power to prevent unexpected start-up, including permitted methods, failure of components and other means of removal of power.

Speakers:

  • John Kovacik, principal engineer, industrial control equipment, UL
  • Dan Neeser, Sr. field application engineer, Bussmann division, Eaton

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