×
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

IEEE 80

IEEE 80

(OP)
My question is. In IEEE 80, Why in fig 33, step 2 is required initially? Is it having influence in next calculations.

Thanks in advance

 

RE: IEEE 80

You need to know the conductor size requirements to prepare an initial design (Step 4).  You don't need it for Step 3, so you could do Step 3 before Step 2.

RE: IEEE 80

(OP)
Thanks jghrist

Yes I also got it. It has been used in Mesh Voltage Calculation (Touch Voltage)
 

RE: IEEE 80

I do not agree.
step 2 is only to dimension cable to support short-circuit current (3I0) and the time (tc) duration of short circuit.

Grounding grid is dimensioned to find an adequate arrangements of cables in order to guarantee shock Calculated Potentials are less then shock Tolerable Potentials for a ground current (Ig) during a shock time(ts).
 

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