Opinion on Supply System Type Wanted: TN-S or TN-C-S | on ElectriciansForums

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J

jlrb

Hi - My first post to this forum.

I am having a disagreement with another electrician on the type of the supply characteristics for a domestic installation, i.e. whether it is TN-S or TN-C-S. I have uploaded a photo of the cutout/supply head. To resolve the disagreement I suggested we ask for a 3rd, 4th, 5th .... opinion from the forum.

The building is in a suburban area and is over 100 years old , not that I am suggesting that the supply head is that old. There are no PME labels/markings. The measured Ze is 0.11 ohms.

Thanks for your views in advance.

jlrb

Supply Type.jpg
 
Did you test L-N fault loop?

measure both pefc and pscc. if they are the same, i'd opt for TNC-S.

As Murdoch and telectrix suggested:

Measured PEFC = 2.10 kA (0.11 ohms)
Measured PSSC = 1.30 kA (0.18 ohms)

This indicates to me that it is TN-S rather than TN-C-S, but I was expecting the relative values to be the other way around - but on reflection I am not sure why I should expect that.
 

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