Shocking...

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WD-40
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Re: Shocking...

Post by WD-40 » Sun Oct 11, 2020 9:50 pm

MarkW wrote:
Sun Oct 11, 2020 9:19 pm
WD-40 wrote:
Sun Oct 11, 2020 4:49 pm
Are you qualified to be working on someone else electrics? If not and something goes wrong in the future it might come back to you. Better to get a proper electrician to give it a once over.
I'm an electrician

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Bender
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Re: Shocking...

Post by Bender » Sun Oct 11, 2020 9:52 pm

Here's a few of the last cables I had the misfortune to run.
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Re: Shocking...

Post by Richzx6r » Mon Oct 12, 2020 8:35 am

Bender wrote:
Sun Oct 11, 2020 1:00 pm
MarkW wrote:
Sun Oct 11, 2020 12:39 pm
What a complete bellend: how the hell have I managed to post this in Forum Help instead of General? :lol:

If someone more competent could move it... :oops:
Sorted.
Or did you mean shorted
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Re: Shocking...

Post by MarkW » Mon Oct 12, 2020 11:56 pm

Now this won't be of any interest to most of you, but for any sparks on here who might be curious...

I popped back round to this house after work to look at their earthing issue. Zs at DB (with the earth rod still disconnected) was 3.17 ohms, so they are clearly getting some earthing from the bonded gas and water pipes, or given that it's an old 19th century school house that has been split into two semis possibly some dodgy wiring shared with next door. I reconnected the rusty old 6 mm earthing conductor to the rusty old earth rod and the Zs came down fractionally to 3.08 ohms. So now it's a property that's earthed almost entirely through the service pipes (which isn't allowed) that looks superficially like a TT system. :roll:

Time didn't allow this evening, but at the weekend I'm going to replace the rusty old earth rod with a shiny new one and run a new 16 mm earthing cable to the board. Before I connect it to the MET I'll measure Ze to see what we get just from the new spike without any earthing from the service pipes.

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Re: Shocking...

Post by JRH » Tue Oct 13, 2020 7:43 pm

What is the soil like where the electrode is?
Years ago during building a new factory had difficulty in getting a good reading on the earth electrodes as the soil was very Sandy after a couple of feet. Ended up having to put an earth mat in.
If after you are still getting a poor reading with the new electrode try watering the area. If the reading improves you may have to look at longer or multiple earth rods.
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MarkW
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Re: Shocking...

Post by MarkW » Wed Oct 14, 2020 7:34 am

JRH wrote:
Tue Oct 13, 2020 7:43 pm
What is the soil like where the electrode is?
Years ago during building a new factory had difficulty in getting a good reading on the earth electrodes as the soil was very Sandy after a couple of feet. Ended up having to put an earth mat in.
If after you are still getting a poor reading with the new electrode try watering the area. If the reading improves you may have to look at longer or multiple earth rods.
I'm not sure what the soil is like to be honest: there's quite a well established garden with various fruit trees, so hopefully it's not just builders rubble!

I've got two 5/8" rods with a coupler, which will get me down to around 8 feet. Would that be better than sticking two in at 4 feet and connecting them do you reckon? I guess it's really going to depend on the nature of the underlying soil...
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Bender
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Re: Shocking...

Post by Bender » Wed Oct 14, 2020 7:59 am

Depends how soft sandy top lair of soil is, if 8ft is doable then I would go with that if you do 2 separate you need to keep them well apart or they are just acting as one in the same bit of shifty soil.
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Re: Shocking...

Post by Six30 » Wed Oct 14, 2020 9:07 am

WD-40 wrote:
Sun Oct 11, 2020 9:50 pm
MarkW wrote:
Sun Oct 11, 2020 9:19 pm
WD-40 wrote:
Sun Oct 11, 2020 4:49 pm
Are you qualified to be working on someone else electrics? If not and something goes wrong in the future it might come back to you. Better to get a proper electrician to give it a once over.
I'm an electrician

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Yeh his last bodge ... I mean job went fine
441915D8-AC01-4FFE-A931-FB9C2828E958.jpeg
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Re: Shocking...

Post by MarkW » Wed Oct 14, 2020 9:50 am

Six30 wrote:
Wed Oct 14, 2020 9:07 am
Yeh his last bodge ... I mean job went fine
Load of fuss over nothing - I was fine...

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