very high earth loop impedence zs

[ricicle]

on one of the sockets im getting like 28.0 ohms

What is you Ze? Have you done R1+R2's to ensure between ccu and sockets/lighting is ok? As said above the maximum is 200ohms with RCD protection, you could try driving in another rod. How deep have you gone so far?

Why would you want to drive in another rod with a Zs reading of 28 ohms on a TT system ?

 

[smithyelectrician]

all i have coming in is a L and N into the meter

and no i have not measured ze yet,will be tomorrow tho

wot do you suggest?

 

[smithyelectrician]

just 1m rod,but to be honest was not that difficult to drive in compared to some rods i have driven in

thats y i was fancying driving another one in on top,but then i found this helpful forum and thaught i would put it to you guys

regards

 

[RF Lighting]

I suggest you employ an electrician to do this work for you

 

[smithyelectrician]

im full scope with napit but thanks for your input

 

[ricicle]

im full scope with napit but thanks for your input

Kitchen fitter or plumber ?

 

[RF Lighting]

That really scares me.

 

[GaryMo]

im full scope with napit but thanks for your input

No offence intended as I don't know you but that's frightening considering your comments in this topic.

 

[londonboy]

Why would you want to drive in another rod with a Zs reading of 28 ohms on a TT system ?

To get the reading as low as possible. He said it wasn't a struggle to drive 1m in so why not put more in and reduce Ze even more? I hate relying on RCD for obvious reasons.

 

[GaryMo]

Why would you want to drive in another rod with a Zs reading of 28 ohms on a TT system ?

To get the reading as low as possible. He said it wasn't a struggle to drive 1m in so why not put more in and reduce Ze even more? I hate relying on RCD for obvious reasons.

You've not much choice with a TT system!!

 

[RF Lighting]

I've yet to find anywhere in West Yorkshire where a PME upgrade isn't available for £75.

 

[ricicle]

I hate relying on RCD for obvious reasons.

No choice on a TT. You will rarely get the impedance down low enough to satisfy disconnection times on some circuits.

 

[Spark123]

Why would you want to drive in another rod with a Zs reading of 28 ohms on a TT system ?

It depends on what the Ze (or Ra) reading is, the 28 ohms could be coming from the MEB to the water or gas or via a neighbouring property or another path which could be considered unreliable.
As long as the Ze is less than 200 ohms (in the worst conditions possible) then the electrode is OK.

 

[bongos]

no i have not measured ze yet,will be tomorrow tho

It shouldn't have taken long to measure the Ze while you were completing other tests...

But now, today, what did the Ze come out at? If it is a PME system then Ze < 0.35&#937;. If it isn't then you need to get the DNO on the phone to sort it out. It is their responsibility to maintain an earth if provided.