Earth rod distance to gas service

[telectrix]

iee say 100 ohms but nic eic are happy with 200

other way round, i think

 

[TinyT]

I got a rod down to 1ohm before, at the side of a road in the centre of london. About 3 lots of 8 5/8 rods. Used a kango though.

True story.

 

[Dunc]

I got a rod down to 1ohm before, at the side of a road in the centre of london. About 3 lots of 8 5/8 rods. Used a kango though.

True story.

Miles of gas and water pipes make great fault paths when you've hit a few of them don't they! :rofl:

 

[TinyT]

Miles of gas and water pipes make great fault paths when you've hit a few of them don't they! :rofl:

When it feels like you have hit a void piece of ground, you know your in the underground system.

 

[Engineer54]

I got a rod down to 1ohm before, at the side of a road in the centre of london. About 3 lots of 8 5/8 rods. Used a kango though
True story.

Glad to see, that there are still those that are prepared to do a decent job of creating a good TT system. Sounds like you missed the predominant London clay, you wouldn't have had to use anywhere near as many rods!! ...lol!!

I wouldn't be a bit surprised that if you went back and retested that TT system, one to three years later, you would find your Ra will be well within the ''sub'' 1 ohm value!!! As most deep driven rod values, improve over the first few years....

A kango or similar purpose made mechanical hammer, is the only sensible way to deep drive rods past 3 metres...