KS 3-2010
Page 5
Section 3
GUIDELINES
3.1 To Avoid Damaged or Otherwise Inoperable Switches Being Inadvertently Returned to
Service
To avoid damaged or otherwise inoperable switches being inadvertently returned to service, it is suggested
that such switches be destroyed.
3.2 Guidance Regarding Inspection and Preventive Maintenance Procedures
Industrial users have requested guidance regarding inspection and preventive maintenance procedures that
could be carried out on a regularly scheduled basis. Sections 4 through 7 of this publication set forth
guidelines for inspection, preventive maintenance, and testing. These clauses may be applied independently
or in combination to establish such a program. For additional assistance, consult the manufacturer's
published instructions or NFPA 70B.
3.3 For Information Regarding Switch Performance and Application
For information regarding switch performance and application refer to NEMA Standards Publications KS 1
and KS 2, respectively.
3.4 Water-Damaged Switches
Switches that are known to have been subjected to water damage should be replaced. For additional
information, refer to the NEMA document Evaluating Water-Damaged Electrical Equipment.
3.5 Switch Inspection Once Each Year
It is recommended to inspect switches once each year or after any short circuit event.
© Copyright 2010 by the National Electrical Manufacturers Association.
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