×
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

Cable Installation Question

Cable Installation Question

Cable Installation Question

(OP)
The Code permits isolated phase installation with certain requirements.

In both low voltage and medium voltage installations, some installations I have seen used isolated phase grouping of cables and they all go straight to the terminations without any problems. The conduit bushings at the terminal points are bonded using a bonding jumper to cancel out heating due to induction.

Did I miss anything here. Is this type of cable installation has any effect to induced current heating along the cable run?

GO PLACIDLY, AMIDST THE NOISE AND HASTE-Desiderata

RE: Cable Installation Question

It works only where there is no magnetic path that completely surrounds anything less than a balanced three phase circuit.    Conduit bushings would be aluminum or brass, steel bushings would become extremely hot and a bonding jumper wouldn't do anything to mitigate that heating.

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