Earth rod placement

[Spikenaylor]

Have posted befor on similar topic,
working on small touring campsite, all TT. Overall reading is 10 ohms. This being made by I suspect the newish pitch installations feeding back through distribution cables to office block.

office block local rod cable was broke, replaced and ze is reading 108 ohms.
Rod in a pit in tarmaced area surrounded by flagging.
some people say put in another rod, some people say do nothing.

First experienance of this so just after some advice.

 

[Sintra]

If it is a threaded 5/8 rod then try coupling another rod to it and go deeper. If it is a 3/8 rod then start again with 5/8 rods.

 

[telectrix]

as sintra says. 2 coupled rods. if the reading is high then, add another.

 

[Spikenaylor]

Nope.not threaded, and top is hammered over, so another rod somewhere.
no plans showing any drainage or anything, so have to work out placement, also dont know ground condition in that area as all tarmaced and flagged

 

[monkeyelectric]

Nope.not threaded, and top is hammered over, so another rod somewhere.
no plans showing any drainage or anything, so have to work out placement, also dont know ground condition in that area as all tarmaced and flagged

If its not threaded does that mean its a farty little 3/8" rod?

 

[Spikenaylor]

Yep, been there for ages, building had been refurbished electrically, but no certificates, and the local rod cable was open circuit.
not installed a rod before, so just looking for advice on best course of action.
i am not saying this is correct, but as the reading is 108 ohms, which is not ideal, but acceptable, RCD protected, and the rest of the site is pulling the ze down to 10 ohms, do I have to do anything, what chance of the rest of the site losing its ze sufficiently enough to bring it all up to 108 ohms, and if it did, then the 108ohms at the office block is still withing spec, just not ideal.

 

[Sintra]

Countdown to E54's arrival now started. :lol:

 

[Guest55]

Countdown to E54's arrival now started. :lol:

he's on his way to his next tt job............

 

[Engineer54]

Yep, been there for ages, building had been refurbished electrically, but no certificates, and the local rod cable was open circuit.
not installed a rod before, so just looking for advice on best course of action.
i am not saying this is correct, but as the reading is 108 ohms, which is not ideal, but acceptable, RCD protected, and the rest of the site is pulling the ze down to 10 ohms, do I have to do anything, what chance of the rest of the site losing its ze sufficiently enough to bring it all up to 108 ohms, and if it did, then the 108ohms at the office block is still withing spec, just not ideal.

Your pretty buggered then if all the surrounding areas are all tarmac, unless the owners agree to some excavation work!!. lol!!

If your overall Ra is at respectful 10 ohms, then leave it as it is....

 

[Engineer54]

he's on his way to his next tt job............


View attachment 18063

LOL!! Things have changed a bit since those day's!! Our company cars are BMW 318's, that i'm almost too frightened to use, past getting to site and home again!! lol!! Drivers don't seem to use the brakes too much, they much prefer the use of the horn!! You need to experience the traffic and the so-called rush hour over here yourselves!! The rush hour last around 10 hours a day!! ...lol!!

 

[Spikenaylor]

Thanks e54
It is what I wanted to hear.
obvioulsy if the office block was on its own supply, then, yes I would install extra rods, but seeing as the whole site is sitting at 10ohms with multiple rods around the site, an the fact that I have 10 M wide strip of Tarmac and flagging for the car park and 6M to the end of the building then still some flagging still the start of the grass area, I am pretty well buggered, but would have got the owners to make a hole in his tarmac, if the answers here were a definitely yes I had to do it.