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2021 National Fire Protection Association (NFPA) 79 Updates

Learn about revisions made to requirements in the 2021 edition of the National Fire Protection Association (NFPA) 79.

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2021 NFPA 79 update: Machine supply circuit and disconnecting means

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

2021 NFPA 79 update: SCCR for machinery

Join UL and Eaton's Bussmann division experts as they delve deeper into how a short-circuit current rating (SCCR) is determined for machinery per the 2021 edition of the National Fire Protection Association (NFPA) 79. The focus will be on the key requirements in NFPA 79 related to SCCR. 

This webinar will discuss the requirements of the 2021 edition of NFPA 79 to help you navigate their intricacies. Determining the SCCR for machinery may not be as simple as determining the SCCR for a single control panel. The process can be quite complex.

In this webinar, you will learn about:

  • SCCR and its benefits for industrial machinery
  • Important definitions related to machinery
  • Meeting industrial machinery codes and standards for SCCR requirements
  • SCCR and available fault current with multipanel machines
  • Labeling SCCR on machinery
  • SCCR versus arc flash

This webinar will also cover a basic understanding of SCCR and how it relates to both control panels and machinery. Included will be a discussion on the importance of having an adequate SCCR for machinery based on the available fault current of the source supplying the machine. Finally, the webinar will conclude with an explanation of how arc flash relates to the selection of proper personal protective equipment (PPE) and the significance of selecting proper PPE for worker safety. 

Speakers:

  • John Kovacik, principal engineer, industrial control equipment, UL
  • Joe Pavia, professional engineer (P.E.), field application engineer, Bussmann division, Eaton

2021 NFPA 79 update: Protection from electrical hazards

Join UL and Eaton's Bussmann division experts as they delve deeper into how protection from electrical hazards is provided per the 2021 edition of the National Fire Protection Association (NFPA) 79. The focus will be on the key requirements in NFPA 79 related to electrical hazards and the means for mitigating them.   

In the 2021 edition of NFPA 79, the requirements for protection from electrical hazards in chapter six have been revised relative to electrical shock hazards. This webinar will discuss the electrical hazard requirements of the 2021 edition of NFPA 79 to help you navigate their complexities. Protecting against electrical hazards involves multiple issues including enclosure construction, double insulation, automatic disconnection of supply, circuits free from the risk of electrical fire and shock, and the presence of residual voltages. Each of these issues poses specific challenges in determining how to mitigate electrical hazards. 

In this webinar, you will learn about:

  • Restricting access to enclosures
  • Evaluating unrated enclosures for protection
  • Accessing an enclosure containing live parts
  • When the use of a key or tool is necessary for access
  • When a disconnecting means is not required
  • Protection for multidoor enclosures
  • Excepted circuits – circuits that remain energized with the main disconnect open
  • Mitigating the shock hazard presented by charged capacitors
  • When it is not desirable to discharge a capacitor

This webinar will also cover the differences between basic protection and fault protection and how these protection methods relate to both control panels and machinery. Included will be a discussion on the importance of enclosure interlocking and under what conditions is access to an enclosure permitted without removing power. Finally, the webinar will conclude with an explanation of protection by the use of Protective Extra Low Voltage (PELV) or Class 2 Circuits and protection against residual voltages.

Speakers:

  • John Kovacik, principal engineer, industrial control equipment, UL
  • Joe Pavia, Professional Engineer (P.E.), Field Application Engineer, Bussmann division, Eaton

2021 NFPA 79 update: Overvoltage protection

In the 2021 edition of National Fire Protection Association (NFPA) 79, the requirements for protection of overvoltages due to lightning and switching surges of safety circuits have been revised and an annex note has been added. This webinar will discuss the new definition and annex note for a safety circuit and when these circuits are considered to be not effectively protected from overvoltages due to lightning and switching surges.

The webinar will also cover the various types and proper selection of surge protective devices (SPDs). Finally, the webinar will conclude with examples of proper protection of overvoltages due to lightning and switching surges of safety circuits.

Speakers:

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