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hi everyone
been reading this forum for a year now and this is my first question i just hope i am doing this right.
on TT earthing we have one box for RA and one for ZE, what box do we use.
 
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D

Deleted member 26818

It depends on what you are measuring.
With most installations where an RCD is used and accuaracy is not really an issue, it's acceptable to measure the Ze, the same as you would with any other installation.
If however you are measuring the resistance of the electrode, and a degree of accuaracy is required then you would measure Ra.
 

telectrix

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as spin says, in general you just measure Ze. measuring the actual Ra is a bit more complicated, and is generally used in industrial installations.
 

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