Additional PME in the TT system?

[tonyhan]

Hi. Guys.

A Washing machine service guy told me better check the earthing so I have a electrician to do peoridical test. It's been failed as Zs is too high. When he looked the system he told me there's no PME in the system and it's highly dangeroud. Well I agreed but I thought it might be TT system.

After he left, I opened the box underneath the consumer unit to check if I'm missing anything. I found 2 things. one earth cable going to Ground and there's main supply with sticker saying it's connected to PME (with Earthing cable).

It confuse me even more. Question I have are

1. if it's TT system, Does PME will help?

2. I cannot see any earthing cable from Main. How it can be connected to PME? as you can see from the photos attached, it say 'this installation is connected to a PME system'

3. I'd like to install PME if it help any then who I need to talk to? I think it's something with supplier.

I wanted to upload few photos to help you and report but it said only up to 19.5kb. I wonder what image can be lower than that size.

Anyway, I can send you photos via e-mail if what I'm explaining is not making sense.

Please help me out. I'm based in Kingston, Surrey

Many Thanks guys

[JohnC]

Hi i've sent you a Pm

[Ohmslaw]

If it is a TN-C-S system as you've said and it is provided by the supplier, then they have a duty to maintain your earth connection. I would contact them first thing in the morning and explain the situation, they should send someone round the same day to investigate.

[JohnC]

Hi Tony

After seeing the Pictures its clear that you can have PME but that it is not connected. With a reading of 3Ohms and providing the electrician carried out a correct ZE Test then i would imagine that the earth cable is connected to a Rod/ of some sort and so would be a TT earth. However you do not have full RCD protection on all the circuits so it would be highly dangerous on a TT earthing system. I see also that the RCD has failed all the tests but there is nothing saying why / what it has failed in the RCD Test field.. Your first step would be to as Ohmslaw said get the supply authority out to take a look at connecting the earth up. Then fond out why the RCD has failed and get it either replaced or the board upgraded to included full RCD protection on all the circuits.. Either way it is dangerous as it is at the moment.