Discuss What's your lowest Ze recorded on a TT system in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net
Test was done at earth rod in the pit just after it was driven in, there is no neutral earth fault within the installation, and the supply has just been commissioned by the LEB.
for dramatic results pour a bucket of water round it and watch the Ze drop like a stone.If you wee on the earth rod i bet you can knock a few more ohms off
After a lot of investigation as to the type of electrode used it was established that the 120mm main earth was conected to
THE EIFFEL BLOODY TOWER!!! to get a Ze like that on a TT.
Wouldn't surprise me in 25 years of sparking never seen a set up like this. Would be interested to know if this type of earthing is common practice in Paris or France in general.
I am going to have to but in here and claim the all time record low for Ze on a TT system.
In Paris last week testing a new installation tested 0.14 ohms for a Ze on a TT (couldn't believe it).
The installation is a large office complex with a 3 phase TT supply. Main incomming cables are 240mm with 120mm main earth. This part of the installation was existing. After a lot of investigation as to the type of electrode used it was established that the 120mm main earth was conected to an earth plate buried in the courtyard of the building. From this plate a tape was run underground around the perimiter of the building and back to the earth plate in a ring.
Hope this gets me into the guinness book of records for lowest Ze on TT.
12.3 ohms
Although highest has been about 64ohms
Yeeeeek, so now we're comparing our highest.....OK, 247 ohms.
bugger cant beat that my lowest is 36ohms
but i may be in the running for the highest 386......
in cornwall ina village built on mining spoil...nice
Out in Paris again last week to finish testing when i was made aware that there was also an earth tape connected from the earth plate to the district steam supply.
Apparantly these district steam pipes go underground for miles and supply heating to the entire city.
Now i can understand the low Ze.
mine waste drains well i guess.
round the corner a house garden fell into old mine workings!!!
this is 100m from the door of my said property!!
you need some earth to get good earth init??
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