TT earthing enquiry.

[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?