×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Breaker Inspections

Breaker Inspections

Breaker Inspections

(OP)
Would you consider the timing of a breaker to be a critical part of a breaker inspection to be in compliance with osha 1910.269 App E?
If you can't prove the opening time of a breaker how can you be in compliance with 1910.269?

RE: Breaker Inspections

That depends a lot on the breaker and what is meant by timing testing.

I have never seen timing tests on low voltage (<1000volts) breakers. Its commonly done on high voltage breakers (>100kV) on commissioning and during periodic maintenance. What the standard seems to be talking about is arc flash and the time to quench the arc.

It's relative common to do breaker testing on breakers >400 amps, at the 480/600 volt level which would include primary current injection with timing of the time to trip both inst. and at 3x over current and do that on a 5-10 year schedule.

Usually arc flash reports will have a statement that the results depend on the break being in operating condition with regular maintenance, which could be just operating it and cleaning or primary/secondary current injection.

David

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Resources

eBook - The Future of Product Development is Here
Looking to make the design and manufacturing of your products more agile? For engineering and manufacturing organizations, the need for digital transformation of product development processes just became more urgent than ever so we wanted to share an eBook that will help you build a practical roadmap for your journey. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close