Can Your Installation Rely on a TT Earth Electrode

UK electrician Matt walks you through the mains end of a TT earthing arrangement that has had a very poor looking earth electrode for the past 15 years. Up until Matt investigated the old gas pipe that was being used at the earth electrode and was corroded as it entered the ground. So under normal installation condition the old earth electrode and the metallic incoming gas and water pipes were providing a very good connection to earth. The problem on this site is the earth electrode was an old gas pipe rotten at the point it entered the ground so if the incoming gas and water were upgraded to plastic the installation could have little or no connection to earth. To improve the installation Matt could install a new earth electrode but he has decided to upgrade the installation to PME. In this video we take a look at the new consumer unit with a type 2 SPD and RCBO's.

== 🕐 Time Stamps - Cut to the action 🕕 ==

00:00 - Consumer unit change
00:26 - Pre test results
00:53 - MCBs ready for SWA cables
01:13 - Ready for extra circuits
01:37 - MET
02:18 - Service head upgrade
02:57 - Earth electrode
04:25 - Is it Instagram ready Matt
05:27 - Fault finding
06:35 - 3mm sleeving

Videos are training aids for City and Guilds (C and G) and EAL courses Level 1, 2, 3 plus AM2, AM2S and AM2E.

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#GSHElectrical #Electricaltrainingvideos #tt #earthing

[mb-electricalservices]

Nice job bud. Lots of forward thinking too which is excellent!! As far as the neatness is concerned, I used to beat myself up quite a lot as I was comparing my work in consumer units to the Instagram crowd. There's nothing wrong with the neatness at all! You have a method that works well and I take my hat off to you.

Mike.

[philipoakley]

+1 for the fault finding aspects!! (Just moved into a new old house with overhead supply, still with original fusing and no clear earthing )

[brianlopez]

Neat use of the ever universal steel washers !

[Dog-whisperer]

Excellent job Matt . And the CU looks good to me.👍
Great video as always

[Doopyy]

I always say that over doing the board with tie wraps is bad practice, now the next guy has to put his side cutters near potentially live parts to locate cables for faults as you said. tells me that people that do that never fault find.

[jdaley]

Nice job. To cover yourself, it would've been a good idea to put a temporary earth rod in.

[kevlark]

At 3:23 I can spot what looks like an old Yaesu FR50B Receiver. I'm a sad collector of radio equipment.

[detroutspinners]

So even though they don’t have a main earth, the builder is safe using his cement mixer because the bonding is giving you a sufficient earth fault loop path?

[leighsmith]

To carry out your fault current on a TT system you should measure between live and neutral, that will give you a true KA reading

[tonywebb]

We always have an earth electrode on every job even though its TNCS. Gas and water will both become plastic fitting after you leave the work behind

[rosskeeley]

Neat and tidy job, nowt wrong with that. 👍🏼

[konstantine]

Our cement mixer doesn't even have an earth 😂

[chas]

You could have used boot lace ferrules for the RCBO leads it stops the copper getting damaged over time 😀

[IAmThe_RA]

Would you conduct earth resistivity test? If yes, please show us.. Thanks.

[jameshansing]

Can you point me towards 7671 where a 6mm bond is ok for 63A? (Not being a smart arse, I’m learning and have been trying to sure up my knowledge of main earth and binding sizes after a couple of jobs working with others)

[JohnDundee-elro]

Better these 2 cpcs and the main earth behind the neutrals

[onefortheroad]

Those instagram attention seekers are an idiots. The cables are not on show so why try and create art out of it? They should be dressing it in the best way for the next guy to work on it. Simple

[ciaranhughes]

On a job yesterday and the supply to their garage was a swa cable that consisted of a 6mm brown 6 x1mm blue with 6mm earth. So neutral is connected via 6, 1mm cables. I have never seen this cable before.

Anyone here know if this is safe. The load should be shared but it's bizzare. I don't want to have to change the cable it's it's safe and sits correct with the regs but I can't find where it's stated otherwise.

Cheers to anyone that replies

[JohnDundee-elro]

Your consumer unit would have looked a lot better if you had all your neutral tails at the front of the main earth the 2 cpc and the 2 reds and blacks just at the neutral bar side of the consumer unit the rest is ok

[phill]

Is the red and black wiring from older cabling? I thought I would have to be renewed for regs