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


Interpretation of shielding in TIA 222-G

Interpretation of shielding in TIA 222-G

Interpretation of shielding in TIA 222-G

I'm having a disagreement with another engineer about the interpretation of this standard's definition of shielding (Section of TIA 222-G, and Figure 2-11).

His contention is that coax cables strapped to a smooth round pole structure would be classified as completely shielded when the wind direction is coming from the opposite side of the pole, and that the cables would be treated a cluster mount (Fig 2-12) with the wind direction 90 degrees to that.

My argument is that a smooth round pole acts as an airfoil under high wind and that the cables would produce a considerable drag regardless of their placement on the pole or the wind direction. However, I can't seem to find any published justification for this view other than the reference in ASCE 7-02 under Other Stuctures, Fig 6-19 which defines force coefficients of different shapes and h/D ratios. This section shows an increased drag coefficient depending on the roughness of the pole's surface varying as a function of the protruding elements (i.e., the coax cable) and the pole's diameter at a given level.

Can anyone provide me with another reference that might support this claim, or am I simply looking at this application too conservatively? Does the TIA standard really mean to define a cable strapped to a pole as completely shielded from the wind in one direction?

Any enlightenment on this would be appreciated.



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!


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