Arc-preventative MCCs – safety and protection for personnel and equipment

By DB Durocher, Eaton

 

Published in:

Electricity+Control, August 2013 (pages 22 – 25)

Enquiries: Mark Strydom. Tel: 011 824 7400 or email MarkStrydom@Eaton.com

 

The full article on Arc-preventative MCCs - safety and protection for personnel and equipment can be downloaded in PDF format.

 

 

Arc-preventative MCCs – safety and protection for personnel and equipment

 

Key strategies are used to help safeguard employees against injuries from electric shock, arc flash burns and arc blasts:

• Multiple insulation and isolation features enable arc flash prevention.
• Unlike conventional MCCs, arc-preventative MCC design enables units to be disconnected and reconnected to the vertical bus with the door closed; maintaining a closed door during these operations increases operator safety.
• A series of safety interlocks ensures that doors cannot be opened and that units cannot be removed from the structure while the stabs are connected to the vertical bus.
• Each unit contains visual indicators that report the position of the isolation shutters and the stabs, providing maintenance personnel with additional assurance that dangerous voltages are not present inside the unit when service is required.
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Take note

  • Increasingly, the risk of arc flash injury is being incorporated into designs and procedures.
  • Arc flash can be associated with an LV MCC.
  • Arc-preventative MCCs are designed to protect personnel and equipment from the danger of arc flash.