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- Thread starter ml1936
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Yes it is preferred method as when you remove wires to test you can introduce faults.
S
sparkyspike
You don't even need to note it down. The normal method, as you probably know, is to measure R1+R2 and calculate Zs, which avoids live testing and is more conclusive.
it's impractical to calculate R1+R2 from a Zs reading..
you will have many parallel earth paths included in a Zs reading and as such it would give an artificially low R1+R2 reading..
you will have many parallel earth paths included in a Zs reading and as such it would give an artificially low R1+R2 reading..
Plus how can you confirm that you have a complete ring on a ring main, and no rings within a ring if you dont carry out R1+R2
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