Rules and Guidelines
Want to participate in the discussions? Please read our Community Rules and Guidelines. Need some help? Visit Support and Answers.

  • State Helpful Answer
  • Replies 2 replies
  • Subscribers 35 subscribers
  • Views 128 views
  • Users 0 members are here
Options
You may also be interested in

IT Earthing System Testing

Les Spiteri

What is the accepatble/understood method of testing an electrical panel where during test the building has a standard TN earthing system however when it gets to final destination it will be using an IT Earthing system?

For example testing the insulation monitors that are required on IT systems to indicate shorts to earth (on 3ph system) that would not trip protection devices or indeed testing that the protection devices do not trip on shorts to earth.

I have had suggested to use a 3ph isolating transformer, however I would suggest that addtional safety measures would be required for testing?

Thanks for any comments, much appreciated.

Parents
  • +1

    I suspect that you will need to understand and perhaps involve the designers of the system,  Unlike TN systems where test methods and limits are pretty much standardized, IT systems are rarer, and application specific.  If you know which insulation monitoring and protective devices are used and how they are configured, then the makers may be able to advise.

    That said, before the wiring is made off, insulation can be verified in the normal way and earthing up to the last point that needs it can be verified by R2 wander lead.

    Mike.

Reply
  • +1

    I suspect that you will need to understand and perhaps involve the designers of the system,  Unlike TN systems where test methods and limits are pretty much standardized, IT systems are rarer, and application specific.  If you know which insulation monitoring and protective devices are used and how they are configured, then the makers may be able to advise.

    That said, before the wiring is made off, insulation can be verified in the normal way and earthing up to the last point that needs it can be verified by R2 wander lead.

    Mike.

Children
No Data

Community Rules & Guidelines