HOW FREQUENTLY GROUNDING RESISTANCE NEEDS TO BE INSPECTED ??

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Anwar Pasha said:
Is there a Code or standard that stipulates a time period, within which the testing of Earth Resistance for an installation must be carried out to see whether the earthing system is working or not??
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You may find some information related to US Govt standard AFI 32-1065. Find on whole building design guide - www.wbdg.org. This is an Air Force instruction manual which has schedules of testing and types of testing recommended.
 
we have Cu rod ground beds >50 yrs old
they are tested twice a year
initially they must be <4 Ohm, typically they are lower
after a year or two they 'settle in' and usually decrease 10-20%
consistent after that

in over 50 locations we have never had one that intially met spec subsequently exceed spec during the biannual testing
 
Ingenieur said:
we have Cu rod ground beds >50 yrs old
they are tested twice a year
initially they must be <4 Ohm, typically they are lower
after a year or two they 'settle in' and usually decrease 10-20%
consistent after that

in over 50 locations we have never had one that intially met spec subsequently exceed spec during the biannual testing
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What is the source of the testing requirement? Insurance company? Industry standard? Internal standard?
 
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