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Thanks for that Ricicle. So the difference is Zs of sub-main is is tested with earth connected and Ze with the incomming earth disconnected. Have I got that correct.

I am doing this same practical exam tomorrow. I still find it difficukt to understand exactly how and where to measure Zs of the sub main. Can anyone help please?

It is the bit form the supply cable armour to the MET.

But it is on the DNO side of things, should they not have to upgrade it if does not comply. I have upgraded the CU and made all the bonding comply and am using this job for my assessment but as I said the main earthing conductor needs replacing. Also it is a flat and and the incoming supply to...

It is a TN-S supply.

....is it to replace/upgrade the main earthing conductor? Does anyone know?

Does anyone know who's responsibility it is to upgrade the supply earthing conductor?

The suppliers earthing conductor for both the flats is from the same connection on the incoming supply armour. This needs to be upgraded to 16mm2. Question is does one upgrade only the earthing conductor our flat and will that then comply even though there is still an old earth connection up to...

I have read that it is better to determine a realistic and therefore more useful Zs value with the main earth bonding disconnected. Does anyone do it this way?

Surely it cannot be TT if this is correct.

Thanks Paul. I am having a field assesment a few weeks after the trade test. If I fail the trade test but pass the field assesment what will I have to do? Can I re sit the trade test but still self certify till I pass it? What I want to achieve is to be able to do my own wiring etc and self...

Has anyone on the forum done the 2 day NAPIT trade test?

Davy Following on from what you have explained, what effect does connecting N to earth as in PME?

It is wired with 2.5mm2 T/E

I noticed that my friend has had two double sockets added this way. Each double socket is connected straight back to one 32A MCB ie 2 very short radials. Nothing else is connected to this MCB. Does this comply.

There will be an isolator in the meter shed, will I need to have one in the house as well?

Apart from relaying the cable what is the best way to extend it. Can I convert it into tails and run them up the wall in large conduit for example, and if so can I use a henly block inside an adaptable box with the armour connected to the earth using a gland/banjo (it is a 3 core SWA).

Impossible to renew SWA. It is buried right up to the house and enters below ground.

Can you help? The supply meter is in a small purpose built shed on the property boundary. The house (new build) is supplied from this via 25mm2 SWA. For some inexplicable reason they have only left enough SWA inside the house for a CU about 600mm of finished floor level. I would like to have it...

Would one radial with only sockets and another with fridge, dishwasher etc be a reasonable distribution?