Discuss high zs readings on site cabin in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net

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Farmelectrics

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carried out dead testing on new site accommodation,all dead tests were fine however, when I conducted live testing I got high zs redings on lighting circuit 22 ohms, fused spur for heater 21 ohms so I thought maybe its a tt system but when I tested sockets I got a reading of 0.69 ohms ze at cabin db was 22 ohms so why the lower reading for the sockets
 
if I'm honest not sure was told it was a tns but need to confirm on Monday weve only landed a site hut on site and was asked to provide a test cert for the cabin
 
agree Essex i did do the ze and pscc pfc first that's were i got the 22 ohm reading from the lighting circuit was similar as was the spur at this stage i wasn't concerned as i presumed it must be a tt system but when i carried out a zs on ring main i got 0.69 and am simply asking why
 
Did you retest the lighting circuit once you got a reduced Zs on the ring final circuit.
 
agree Essex i did do the ze and pscc pfc first that's were i got the 22 ohm reading from the lighting circuit was similar as was the spur at this stage i wasn't concerned as i presumed it must be a tt system but when i carried out a zs on ring main i got 0.69 and am simply asking why

Where did you test the Ze? It should have been clear what the earthing arrangement is it that point.
 
carried out dead testing on new site accommodation,all dead tests were fine however, when I conducted live testing I got high zs redings on lighting circuit 22 ohms, fused spur for heater 21 ohms so I thought maybe its a tt system but when I tested sockets I got a reading of 0.69 ohms ze at cabin db was 22 ohms so why the lower reading for the sockets
Neutral/Earth fault on sockets.
 
there are no faults on sockets dead tests were all ok I took a zs at the site cabin sorry not a ze now I know the cabins are protected by a commando socket / rcd so the readings are actually ok ie 1667 ohms but its the zs of 0.69 that had me scratching my head will retest on Monday but was looking for ideas on the matter thanks in advance
 
It is possible the external impedance of the cabin dramatically changed between tests. You need to work back to the source and confirm the earthing system before you continue.
 
just wondering if an operator error took a reading L-N instead of L-E?????
 

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