KS 3-2010
Page 8
Evidence of excessive high current switch closing operation includes:
• Bright metal or metallic deposits on insulating surfaces or the enclosure interior
• An excessive number of small, bright metal balls resting on the enclosure bottom end
wall
• Excessive black film on insulating surfaces or the enclosure interior adjacent to the
contact air gap or arc chute exhaust
• Enclosure shape distortion caused by excessive internal pressure
• Contacts not fully engaging or closing
• Rough mechanism operation
4.3.2.6 Reinstallation Procedure
For reinstallation or replacement of the switch and/or accessories, follow the installation safety
procedures given in 2.3 in conjunction with any installation instructions provided by the manufacturer.
© Copyright 2010 by the National Electrical Manufacturers Association.
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