×
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

EARTHING STANDERDS FOR HT SWITCHGEAR AND HT MOTORS

EARTHING STANDERDS FOR HT SWITCHGEAR AND HT MOTORS

EARTHING STANDERDS FOR HT SWITCHGEAR AND HT MOTORS

(OP)

 IS THERE ANY DIFFERECNE BETWEEN A HT SWITCHGEAR  AND HT MOTOR WHILE PROVIDING NO OF EARTH CONNECTIONS FOR ITS PROTECTION ? WHAT DOES IEC STANDERD  SAY IN THIS REGARD ?IF IT IS NOT SAME ,THEN WHY SO ?

RE: EARTHING STANDERDS FOR HT SWITCHGEAR AND HT MOTORS

It's not clear what your asking -- can you rephrase the question?

RE: EARTHING STANDERDS FOR HT SWITCHGEAR AND HT MOTORS

(OP)
AS PER IEC TWO EARTHING CONNECTIONS ARE PROVIDED TO A 3.3KV HT/415V LT  PANEL WHERE AS ONLY ONE EARTHING CONNECTION IS SHOWN TO HT/LT MOTOR OV SAME VOLTAGE RATING.IS IT CORRECT ?IF SO GIVE TECH REASONS FOR IT ?.  IN SHORT WHY TWO EARTH CONNECTIONS ARE PROVIDED TO HT PANEL WHERE AS HT MOTOR IS PROVIDED ONE EARTHING OF SAME VOLTAGE RATING ?I HOPE NOW THE QUESTION IS CLEAR ? WILL SOME MEMBER FROM IEC ANSWER?

RE: EARTHING STANDERDS FOR HT SWITCHGEAR AND HT MOTORS

narsimha23,

Please look around your computer keyboard for your caps lock and turn it off.  All upper case is hard to read.

Multiple grounding connections to major equipment is common as an added margin of safety and to lower the impedance to ground.  This is what we often call a "belt and suspenders" approach.  If one is good, two are better.  

I have no idea what IEC requirements are, but making two ground connections will not hurt anything.

RE: EARTHING STANDERDS FOR HT SWITCHGEAR AND HT MOTORS

Can someone tell me where i can look up the standards for all earth sizes, with a particular size conductor. (what size earth is needed for a cable)?. also where excatly the groundings should be (one on the motor the other at the switchgear)?.
Thankyou

RE: EARTHING STANDERDS FOR HT SWITCHGEAR AND HT MOTORS

streeta,

Whilst several standards give certain guidelines, national codes will dictate earth conductor sizes alongside with the system application.  What Im trying to say is;  It depends...

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