×
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!
  • Students Click Here

*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

Jobs

Feeder Cable Splice Near Swithgear

Feeder Cable Splice Near Swithgear

Feeder Cable Splice Near Swithgear

(OP)
Hi:

Recently a phase conductor on a 3-Ph, 480Vac system suffered some damage due to overtemp caused by a loose breaker terminal lug.

Rather than replace the feeder, we chose to temporarily splice a new conductor length to replace the damaged section that was cut off.

Some folks in my organization think that the splice should have been made futher down stream away from the switchgear and enclosed in an appropriate box.

Others feel that if a fault occurs due to splice failure the feeder will be protected by the breaker.

Comments please...

RE: Feeder Cable Splice Near Swithgear

The splice will probably last longer than the rest of the conductor.  Splices should be in an accessible location; i.e., you should make up the splice after pulling the cable instead of pulling the splice into a conduit.

William

RE: Feeder Cable Splice Near Swithgear

The splice kit should have the same temperature rating as the insulation of the conductors being spliced, at least as high as the rating of the nearby breaker termination.  As long as it is accessible, I don't see a big problem.  In an ideal world, you would never splice a power circuit, but based on my little corner here at least, the world is far from ideal.

RE: Feeder Cable Splice Near Swithgear

Hi,
  I like the idea of the splice away from the switchgear, particularly for high fault currents. That way if you have a fault at a known weak point (the splice) you don't risk the switchboard as well, and the fault current will be lower further away from the board.

  I'm not sure about enclosing it. Any splices we have are included in thermoscanning for some piece of mind.

  What kind of load and fault currents have you got?

Regards,
   Martin

RE: Feeder Cable Splice Near Swithgear

If a fault in the splice is protected by the breaker, it will be protected by that breaker no matter how far down the line the breaker is.

JMB

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!


Resources