×
Follow Us
Results 1 to 2 of 2

Ground Resistance Testing IT System

    #1
  1. Join Date
    May 2017
    Posts
    1
    Reputation

    Ground Resistance Testing IT System

    Question here we have been discussing can you perform a ground resistance test with a clamp on meter on an IT (Insulated form Earth) system with no Neutral. I am thinking that the answer is no since there is no return path for the induced signal to return on.

  2. #2
  3. SecondGen's Avatar
    SecondGen is offline
    I push buttons.
    NETA Level III Pro Subscriber
    Join Date
    Jan 2014
    Location
    United States
    Posts
    375
    Reputation
    Quote Originally Posted by rig-electrician View Post
    Question here we have been discussing can you perform a ground resistance test with a clamp on meter on an IT (Insulated form Earth) system with no Neutral. I am thinking that the answer is no since there is no return path for the induced signal to return on.
    You are correct. The clamp-on tester is only effective in situations with multiple grounds in parallel. It cannot be used on isolated grounds, as there is no return path. In addition, it cannot be used if there is an alternate lower resistance loop not including ground.

    Clamp-on testing requires a good return path, is susceptible to noise, has reduced accuracy and cannot be used on isolated grounds. It is not applicable for installation checks or commissioning new sites and has no built in proof.

    Would recommend "Getting Down to Earth" by Megger to anyone who is interested in reading up more on the topic. https://portalvhds963slh4m3fqg2.blob...ownToEarth.pdf

Subscribe

Login or register to leave a reply!


Share this thread

Related Topics

  1. Looking for chart on soil types for ground resistance testing
    By madMAX in forum Electrical Testing Talk
    Replies: 7
    Last Post: June 27, 2018, 12:49 PM
  2. Replies: 7
    Last Post: August 3, 2017, 03:38 PM
  3. Testing ground resistance with no earth to drive rods
    By iwanttotest in forum Electrical Testing Talk
    Replies: 2
    Last Post: February 23, 2017, 09:39 AM


Related Content


Follow us


Explore TestGuy


NETA Certification Training


NICET Electrical Power Testing


Help and Support