×
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

Direct burial of unarmored MV cables
2

Direct burial of unarmored MV cables

Direct burial of unarmored MV cables

(OP)
I am designing 33 kV cabling system in a wind farm, can I go for direct burial of single core cables (unarmoured) without pipes? using fine sand as a back-fill and protective tiles?

any IEC reference?

RE: Direct burial of unarmored MV cables

I don’t think such IEC standard exists. Usually there are national [regional or per utility] standard for installation purpose. For instance:
-IEEE Std 525-1992, IEEE Guide for the Design and Installation of Cable Systems in Substations. ch.13.1 Direct burial
By the way, here it is mentioned as follows:
"This system has low initial cost, but does not lend itself to changes or additions, and provides limited protection against the environment. Damage to cables is more difficult to locate and repair in a direct burial system than in a permanent trench system."
-National Electrical Safety Code (NESC) /2007 Section 35.Direct-buried cable
-US AIR FORCE
http://armypubs.army.mil/eng/DR_pubs/dr_a/pdf/tm5_...
CH.7-5. Direct-Burial Cable Installations.
-U.K. DEFENCE ESTATES MINISTRY OF DEFENCE Specification 034 Electrical Installations. SECTION SIX - CABLE INSTALLATION
-DIN/VDE 0289 ,100,101

RE: Direct burial of unarmored MV cables

Whether you can or can't lay the cables direct depends entirely on local codes and legislation. Utilities in the UK use unarmoured 33kV cables routinely. The cables are generally single core polymeric with a copper wire screen. However the legislation requires them to be marked and protected, which if laid direct would mean sanded as you describe, and covered with cable tiles which these days are made of recycled plastic rather than concrete.

Regards
Marmite

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