×
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

TNC earthing system

TNC earthing system

TNC earthing system

(OP)
The TNC system is rare in the UK. It is a system where the source star point is earthed through an impedance and the function of neutral and earth is combined througout the system.
I would like to find out more about the use of this system, advantages and disadvantages etc. Could anyone advise from where such info might be sought?

Regards,

Lyledunn

RE: TNC earthing system

(OP)
Thanks Busbar.
Interesting site but I am afraid no mention of the system I was looking for. I have a feeling that this system may have a use say in production lines etc where security of supply is paramount. It may be used with earth monitoring devices.
I am really looking for someone who has used the system. As it is a rarity in the UK,I have no direct experience.

Regards,

Lyledunn

RE: TNC earthing system

Are you sure you mean TN-C? This system does not usually use an impedance to to earth. The system that does is IT and is used where supplies are critical -operating theatres spring to mind.

RE: TNC earthing system

Lyle, I have experience with high-resistance grounded systems in the western US, based on ANSI standards; not in the UK.  Don’t know if that’s of any use to you. tmp173@@nikola.com
  

RE: TNC earthing system

(OP)
Powrgn,

Yes, I do mean TNC, Re; Geofrey Stokes commentary on the IEE wiring regulations. However, you may be right, I really have no experience of this system. I am assuming that because phase will in effect be connected to exposed conductive parts through the winding or element of the piece of equipment concerned then it would be sensible to have some kind of limiting impedance at the connection with earth at source.

Many thanks busbar, I need to get this out of my hair first. (whats left of it!!)

Regards,

Lyledunn

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