Grounding test well

[anbm]

Is there a min. or max. number of grounding test well required especially when the building has lightning protection system with
several ground rods buried? How to meter the ground rod resistance or access the rod if there is no grounding test well installed at each ground rod?
Thank you.

 

[tom baker]

to measure resistance use a clamp on ground resistance tester

 

[chevyx92]

How to meter the ground rod resistance or access the rod if there is no grounding test well installed at each ground rod?
Thank you.

We use these to test all our lightning protection systems.

http://us.megger.com/auto-earth-tester-det2/2

 

[publicgood]

We typically install a test well at each corner of the building.