TT earthing enquiry.

[driverJohn]

Hi do tt earth systems highly require a rcd, and if not are upfront rcds a must in the tt earthing systems? Cheers

 

[driverJohn]

+ i got duplicate accounts so i will have to be banned for that

 

[DPG]

yes mate can you remove this entire thread, i give up. With this thread it might motivate me in touching the cutout fuse so might aswell remove this thread

Not sure what the problem is here. People have taken time to give you thoughts and opinions. Just open up the tiling and we can see what's there.

 

[Dave OCD]

I'm afraid this is another one where despite very sound and safety critical advice the OP seems hell-bent on disregarding everything to avoid an RCD , potentially lethal. We might as well give up on this one...

 

[nicebutdim]

My concern is that there is apparently considerable uncertainty about whether this installation would disconnect under fault conditions as opposed to sitting there with live metalwork ready to kill someone.
From the questions asked I don’t think we are going to be able to reliably guide the OP to an answer.
This could be a life or death matter and as DPG said the installation really needs looking at asap.

I've seen TT installations where a fault meant live metalwork - not a fun situation.

 

[driverJohn]

yeah true but the lucky man here got earth leakage circuit breakers, but its kind of disappointing to see that as all the pipes are connected with the earth and under a fault condition not all current flows to the elcb as some goes to the other pipes and most luckily they have lower impedance compared to the breaker.

 

[Dave OCD]

I've seen TT installations where a fault meant live metalwork - not a fun situation.

Exactly, without any additional RCD protection and say a Ze of 80 ohms you'd have a dead short live/earth current of around 3 amps, wouldn't worry even a 6a MCB so all the earthed metalwork sits at mains voltage.

 

[Dave OCD]

yeah true but the lucky man here got earth leakage circuit breakers, but its kind of disappointing to see that as all the pipes are connected with the earth and under a fault condition not all current flows to the elcb as some goes to the other pipes and most luckily they have lower impedance compared to the breaker.

Without any intention of causing offence I believe that you have a very poor knowledge of requirements for protection against shock and I strongly advise you to get an Electrician in for safety's sake.

 

[Dave OCD]

I've just realised that the OP seems to be based in Africa so I'm not competent to advise, but surely there must be RCD requirements ?!

 

[driverJohn]

I've just realised that the OP seems to be based in Africa so I'm not competent to advise, but surely there must be RCD requirements ?!

Yeah true here the elcb's still remain fine in the regulations im aware that they dont protect people but rcbos are good upgrade hmm...

 

[driverJohn]

Without any intention of causing offence I believe that you have a very poor knowledge of requirements for protection against shock and I strongly advise you to get an Electrician in for safety's sake.+

Without any intention of causing offence I believe that you have a very poor knowledge of requirements for protection against shock and I strongly advise you to get an Electrician in for safety's sake.

Well i do both part time dentist and electrician

 

[timhoward]

Well i do both part time dentist and electrician

That’s got me wondering if your dentist’s drill is earthed and part of the same installation…..!
Where in Africa are you, out of interest?

 

[driverJohn]

just joking about the dentist mate
im from south africa
also i opened up the tiles and the only thing i saw was full of earth wires???
cheers m8

 

[DPG]

just joking about the dentist mate
im from south africa
also i opened up the tiles and the only thing i saw was full of earth wires???
cheers m8

Any photos yet?