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Very low Ra reading disappears when connected back up.

aligarjon

Hi Guys

I had some very strange readings today when doing an EICR.   Property is a semi detached cottage in a very rural location. Over head supply. 

The first thing i noticed when i arrived was a piece of angle iron driven into the ground outside the front door with a corroded 10mm earth cable bolted to it exposed for all to see.

The consumer unit is located just inside the front door in a cupboard and i can see the earth cable going out through the door frame.  I disconnected it at the CU and got an Ra reading of just over 2 ohms so i am obviously amazed. I reconnect it to the CU to get a PFC reading etc and the Zdb is nearly 300ohms with the original earth reconnected. I disconnected it again and got just over 2 ohms again. Reconnected it and got around 300ohms.  

This is a new one on me, does anyone know what could be going on ?

Cheers  Gary

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    Are you measuring RA like a loop test, live to electrode. ?  I wonder what is on the end of the angle iron, it is very low - there are some transformers that do not make 2 ohms, or indeed anything like so any consumer Zs on those runs are doomed to be more than that.

    Else give things a good clean - it may be the being moved around that it does not like ...

    Mike

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  • 0

    Are you measuring RA like a loop test, live to electrode. ?  I wonder what is on the end of the angle iron, it is very low - there are some transformers that do not make 2 ohms, or indeed anything like so any consumer Zs on those runs are doomed to be more than that.

    Else give things a good clean - it may be the being moved around that it does not like ...

    Mike

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