Operation
150/214 Revision 11 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DA10 • 861-9601.9
Operation
DANGER
Internal arcing and explosion hazard
Will cause death, serious injury or property damage.
The switchgear may or may not be classified as arc-resistant switchgear.
Check the information on the rating plate for the switchgear to determine if it has an internal
arc classification. If the switchgear has internal arc classification IAC A FL, the area behind the
switchgear is not tested to evaluate the effects of internal arcs. Personnel must be prevented
from entering the area behind the switchgear when the switchgear is energized.
If the switchgear is classified as arc resistant, note that it is not arc resistant unless all of the
following conditions are met:
➭ All pressure relief devices are free to operate as designed.
➭ The fault energy available to the switchgear does not exceed the internal arcing short-
circuit current rating and rated arcing duration of the switchgear.
➭ There are no obstructions around the switchgear that could direct the arcing exhaust
products into an area intended to be protected.
➭ The switchgear is installed in accordance with the information in the instruction manuals
and drawings
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