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