×
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

Shielded cable requirements

Shielded cable requirements

Shielded cable requirements

(OP)
It is my understanding that under NEC requirements you must use shielded cable when running above 2400V.  Someone also told me that if you have a transformer that has a voltage tap above 2400V you must use shielded cable whether or not you are using the tap or not.  For example if I have a transformer that has a 2000V tap and 5000V tap, they claim that I need to run shielded cable coming out of the transformer no matter which tap I am using because the transformer has at least one tap that is rated greater than 2400V.  I have not been able to find any code to support this claim and was hoping someone had some information, thanks.

RE: Shielded cable requirements

Sounds like an interpretation by local AHJ.  I don't think this is spelled out in the NEC.  They only talk about actual operating voltage.  

Of course, you'd also need to provide insulation rated for the higher voltage in addition to the shield.  

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