Rosslyn, Va.-based National Electrical Manufacturers Association (NEMA) has published KS 3-2010, "Guidelines for Inspection and Preventive Maintenance of Switches Used in Commercial and Industrial Applications." This new standards publication was developed by NEMA’s Switch Voting Classification of the Low Voltage Distribution Section.
KS 3’s guidelines are intended to be used to identify switches requiring maintenance or replacement. When appropriately maintained, switches can provide reliable protection for many years. Regular inspection and preventive maintenance help ensure that a high level of protection is provided to personnel and electrical equipment.
Topics covered in the publication include safety procedures, general guidance, inspection procedures, preventive maintenance, non-destructive test procedures, and the operation of accessory devices.
KS 3 may be downloaded at no charge, or a hardcopy purchased for $58, by visiting www.nema.org/stds/ks3.cfm.
