ZE reading of 312 Ohms

[Forty4]

Just doing a EICR on a property and got a ZE of 312 ohms and PFC of 1 amp!

Time to call the DNO

 

[KAS1]

What is the earthing arrangement suppose to be?

 

[Forty4]

It's a TNS supply

 

[telectrix]

just out of interest, i'd also get a Ze reading with earth and bonding connected. if it's considerably lower, it proves the earth path through the water/gas pipes and verifies that you've not cocked up on your initial measurements.

 

[Forty4]

I did that straight away to check MFT was ok and got a reading of 0.61ohms

 

[oldtimer]

just out of interest, i'd also get a Ze reading with earth and bonding connected. if it's considerably lower, it proves the earth path through the water/gas pipes and verifies that you've not cocked up on your initial measurements.

Plus it proves you are not sharing an earth as this is getting more common ie Zs at a socket is fine but disconnect the earth bonding and thats when you find there is no earth or high reading. I had this 3 months ago where an old biddy was scared to death because she did not have an earth but she did through the flat upstairs

 

[telectrix]

nice to think that BG with the socket and see jobby would have seen that as a perfect earthing system, and it would stay like that till a proper sparks tested it properly.

 

[Engineer54]

I did that straight away to check MFT was ok and got a reading of 0.61ohms

Are you Sure?? That reading seems just a Tad too low to me!!

 

[oldtimer]

Are you Sure?? That reading seems just a Tad too low to me!!

Not if it is a borrowed or shared earth ie person upstairs has an earth and their water and gas is bonded

 

[MikeyT]

Surely you would spike it then?

 

[GLENNSPARK]

Surely you would spike it then?

would you?..
and if its distributers earthing arrangements....?

 

[Forty4]

Distributor came out and changed it to TNCS this afternoon new ZE reading is 0.30 ohms

 

[GLENNSPARK]

Distributor came out and changed it to TNCS this afternoon new ZE reading is 0.30 ohms

forty4?
is that a stylish way of announcing `old gyt?`...lol..:joker:

sounds like some cafe bar or summat...lol..

 

[Engineer54]

Not if it is a borrowed or shared earth ie person upstairs has an earth and their water and gas is bonded

But that would mean that the whole block would have been affected by this DNO earthing fault, so no low values being picked up from the EMT's of other flats, and i doubt if a service Water and Gas supply would be sitting at 0.6 ohms on their own!!

 

[Forty4]

Distributor came out and changed it to TNCS this afternoon new ZE reading is 0.30 ohms

forty4?
is that a stylish way of announcing `old gyt?`...lol..:joker:

sounds like some cafe bar or summat...lol..

No im 26, i race Motocross (scrambling for you old guys) and 44 is my race number.

 

[MikeyT]

would you?..
and if its distributers earthing arrangements....?

I read and thought there was no earth at all and there wasn't a possible connection to another property. I think blindly posting is not advised!