KS 3-2010
Page iv
Section 7 deals with the operation of accessory devices. Failure of an accessory would lead to
replacement of that accessory, or switch replacement if accessories are not removable.
In summary, following an automatic overcurrent interruption at or near its interrupting rating, the condition
of any protective device should be checked prior to circuit re-energization. Switches that have
experienced multiple high short-circuit-current faults, as evidenced by conditions at the source of the
faults, should receive a thorough inspection per the guidelines of NEMA KS 3. This document should also
be used for recommended, periodic, preventive maintenance.
© Copyright 2010 by the National Electrical Manufacturers Association.
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