Broken Breakers, Part 4

March 13, 2012
Previously, we addressed some items you should include in your breaker maintenance procedures

Previously, we addressed some items you should include in your breaker maintenance procedures. Now, we'll look at three more such items. These are typically mentioned together. The industry jargon for these is "check anchorage, alignment, and grounding."

What do these really mean?

  • Anchorage. Typically, a breaker mounts to its enclosure (or draw-out rack) via several bolts. Check all fastening points.
  • Alignment. This test procedure involves operating the breaker multiple times to ensure the secondary connectors properly engage. The actual testing doesn't take long, but setting it up could take considerable time due to load disconnecting requirements and necessary safety procedures.
  • Grounding. Breakers in your facility are bonded, not grounded (see NEC Art. 100 definitions). At a minimum, visually inspect. To maximize reliability, test the bonding connections with an AC low-ohm meter.

Voice your opinion!

To join the conversation, and become an exclusive member of EC&M, create an account today!

Sponsored Recommendations

Electrical Conduit Comparison Chart

CHAMPION FIBERGLASS electrical conduit is a lightweight, durable option that provides lasting savings when compared to other materials. Compare electrical conduit types including...

Fiberglass Electrical Conduit Chemical Resistance Chart

This information is provided solely as a guide since it is impossible to anticipate all individual site conditions. For specific applications which are not covered in this guide...

Considerations for Direct Burial Conduit

Installation type plays a key role in the type of conduit selected for electrical systems in industrial construction projects. Above ground, below ground, direct buried, encased...

How to Calculate Labor Costs

Most important to accurately estimating labor costs is knowing the approximate hours required for project completion. Learn how to calculate electrical labor cost.