Earth rod needed for shed supply or pme allowed ????

[Tim collins]

should you install a earth rod if running a feed to a shed which is built on timber frame and is all timber , no metal parts and will have no services ie gas or water in it so no need for bonding only a supply for a light and a couple of sockets or can you use a pme earth from fuseboard if the shed supply is run in 6mm armoured from the outside of the house ( inside house 6mm t+e to fuseboard ) protected by 32amp rcbo will be installing a 2 way board with rcd main switch in shed approx 25 meters away

 

[Nigel]

@oracle didnt quote you

Agreed. Thank you.

 

[oracle]

Reason I didn't quote you is I wasn't addressing it to you, simply posing an axiom. If you don't know about Type S RCD’s, I suggest you research them, along with the other types as well. BSEN 61008 and 61009 are not the only RCD’s out there.

 

[Nigel]

@oracle didnt quote you

Agreed. Thank you.

Reason I didn't quote you is I wasn't addressing it to you, simply posing an axiom. If you don't know about Type S RCD’s, I suggest you research them, along with the other types as well. BSEN 61008 and 61009 are not the only RCD’s out there.

I know all about Type S RCDs.

Again, why would the distribution circuit feeding the CU in the shed need a Type S RCD protection. You are the one saying to use it but cannot back it up.

 

[petermouse]

On this subject I recently spoke to an electrician who was repairing a street supply cable under the pavement. He agreed that out buildings should be TT’d. Because when a supply cable is repaired the tendency is to make it Tncs connecting the earth to the neutral to get better Ze readings. So a property with an apparent tns at the supply end may well be a tncs. Also on the subject of on a completely wooden/plastic construction no extraneous metal parts, then allowing the installer to extend the local earth to it. No mention is made of the danger of using class 1 equipment in this environment. I feel the more I read the less I actually know.

 

[Wilko]

... I recently spoke to an electrician who was repairing a street supply cable under the pavement. He agreed that out buildings should be TT’d. Because when a supply cable is repaired the tendency is to make it Tncs ...

Hi - supplies that present at the installation origin as TNCS (with or without PME) can be extended to outbuildings. The means of earthing at the origin can be reused at the outbuildings, it just needs to be properly designed. So my 20p worth is Mr StreetSupply is wrong .

 

[FatAlan]

I have a couple of out buildings total run about 50m which were fed by suspended 4mm T&E from RCD protected CU at house. Each shed CU was/is rodded. In the process of swapping to buried 6mm SWA on seperate MCB protected circuit with RCBOs at shed. Will use PME but also keep rods. This brings up old discussion that DNO engineer when converting a TT to PME advised that the rod be disconnected as it can cause nuisance tripping. I did leave it in place with no problem.

 

[oracle]

Agreed. Thank you.


I know all about Type S RCDs.

Again, why would the distribution circuit feeding the CU in the shed need a Type S RCD protection. You are the one saying to use it but cannot back it up.

Told you already, I was posting an axiom also told you before you appear to be a Troll. I will not respond to anything you post in future, so please don't tell me that I haven't answered your questions. I won't!

 

[Strima]

This brings up old discussion that DNO engineer when converting a TT to PME advised that the rod be disconnected as it can cause nuisance tripping.

That's where I've been going wrong, just remove the earth and your problems go away...

 

[Midwest]

Wasn't the 18th draft proposing rodding (pardon me) all PME or TNC-S supplies?

 

[Strima]

Wasn't the 18th draft proposing rodding (pardon me) all PME or TNC-S supplies?

It did but never got written in, it will probably be in the 1st amendment.

 

[Michael Sands]

Am I the 100th reply? Do I get a prize

 

[Octopus]

Am I the 100th reply? Do I get a prize

But you offered nothing for the debate - and you weren't the 100th - so no!

 

[Nigel]

Told you already, I was posting an axiom also told you before you appear to be a Troll. I will not respond to anything you post in future, so please don't tell me that I haven't answered your questions. I won't!

Yeah I would do that also if I never knew Type S RCDs are not suitable when 30mA additional protection is required.