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