Date: May 12th, 2021, 12:00 PM to 1:30 PM (MDT)

Presented by: Michael W. Wactor, P.E., Technical director
for Corporate Product Development of Powell

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When properly designed, tested, and installed, arc resistant
switchgear provides increased arc flash hazard protection for
personnel operating around the equipment. However, there are many
factors that influence the equipment performance and many effects
from an arc flash that are often overlooked. To obtain the maximum
benefits from arc resistant equipment installation, one must
understand how the fault behaves, how equipment is tested and
evaluated and how this relates to the goals of the total safety

This presentation will discuss the physics of an arc fault and how
this affects design, testing and application. It will highlight
some of the fundamental features of arc resistant design to show
how such designs are used to address the fault hazards and how
this relates to the requirements of other safety documents such as
NFPA 70E and Z462. It will also discuss how the equipment works in
conjunction with other protective devices to minimize operator
exposure to arc fault hazards.

The presentation will conclude with how the test requirements,
performance criteria, and test results interpretation found in the
IEEE Guide C37.20.7 relate to actual application and discuss
upcoming changes proposed for the document.