TT rod installation guidance.

[Andy78]

Can anyone link me to any official guidance on the installation methods for earth rods in a domestic TT system.
Basically I am looking for something which would state that bashing a single skinny rod into the ground under the floorboards in a domestic property is not a suitable method of installation.

Not having any luck with my own searches so far.

 

[polo1]

What's the Ra?

 

[Silly Sausage]

Have you seen this...

http://www.weschler.com/_upload/sitepdfs/techref/gettingdowntoearth.pdf

It may help!

108 pages of Earthing joy here ...

http://www.cablejoints.co.uk/upload...opper_Development_Association_Publication.pdf

 

[GEOFF S]

Can anyone link me to any official guidance on the installation methods for earth rods in a domestic TT system.
Basically I am looking for something which would state that bashing a single skinny rod into the ground under the floorboards in a domestic property is not a suitable method of installation.

Not having any luck with my own searches so far.

Theres not a one size fits all, the main issue with a short electrode is stabilty, the diameter of the earth rod wont make a significant differance to the overall Ra. You could argue that indoors the firts meter of the rod wont be subject to seasonal variation.

Cheers

 

[Pete999]

Can anyone link me to any official guidance on the installation methods for earth rods in a domestic TT system.
Basically I am looking for something which would state that bashing a single skinny rod into the ground under the floorboards in a domestic property is not a suitable method of installation.

Not having any luck with my own searches so far.

https://www.youtube.com/watch?v=oYb2jqD7cH4

 

[DPG]

I can sense Eng54 typing as we speak Daz

 

[Andy78]

Theres not a one size fits all, the main issue with a short electrode is stabilty, the diameter of the earth rod wont make a significant differance to the overall Ra. You could argue that indoors the firts meter of the rod wont be subject to seasonal variation.

Cheers

All very true, but I was of the understanding that the rubble strewn backfill round foundations was to be avoided, especially with short rods.

 

[GEOFF S]

All very true, but I was of the understanding that the rubble strewn backfill round foundations was to be avoided, especially with short rods.

Very true, you are the only one who can decide if the installation is suitable. If a rod is installed in rubble will it be a stable Ra, id expect a very poor reading.

Cheers

 

[DPG]

Quick impression, see who can guess it:

'Anyone who believes those 'twigs' are acceptable is a complete moron!!! Lol !!! '

 

[Andy78]

Very true, you are the only one who can decide if the installation is suitable. if a rod is installed in rubble will its be a stable Ra, id expect a very poor reading.

Cheers

The reading is around 40 Ohms right now, but this area has a very high water table and is sodden right now. There is certainly evidence of rubble within the ground under the floor.

 

[Andy78]

Cheers for the testing method links guys but that's not an issue I am having problems with.

 

[Andy78]

Have you seen this...

http://www.weschler.com/_upload/sitepdfs/techref/gettingdowntoearth.pdf

It may help!

108 pages of Earthing joy here ...

http://www.cablejoints.co.uk/upload...opper_Development_Association_Publication.pdf

Cheers Archy, I'll get plodding through that second document.

 

[GEOFF S]

The reading is around 40 Ohms right now, but this area has a very high water table and is sodden right now. There is certainly evidence of rubble within the ground under the floor.

Well if you are concerned with the installation, suggest to the custommer the addaition of a further electode, if the inly option is internal i would bore a 100mm hole or dig, then you can see the ground conditions, from there if all is okay, drive in as deep as you can and backfill with marconite.

Cheers

 

[HandySparks]

The reading is around 40 Ohms right now, but this area has a very high water table and is sodden right now. There is certainly evidence of rubble within the ground under the floor.

I'd say that this is fine for now but that you should arrange to re-visit later in the year after it's been dry for a while. Then re-test and make a final judgement.

 

[Andy78]

I probably should have mentioned that a valid TN-S connection has been disconnected in favour of this rod. I didn't mention this as it's part of a huge can of worms concerning a recent CU swap by another contractor that I'm currently helping a customer with, and didn't want the thread to get bogged down in other stuff.

I was really just after any guidance on accepted standards of rod installation to add to my ammo box.