Inspection Schedule: Section 3 | Earthing/Bonding arrangements
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- Опубликовано: 21 окт 2024
- In this video I go through the inspection schedule in Section 3: Earthing/Bonding Arrangements. I go through what you are looking for and reference it the the appropriate regulations in bs7671. This is not an exclusive list of all inspections to be carried out, but rather the beginning stepping stones to building your own engineering judgement while inspecting and testing.
Fellow electricians please add information to the comment section to help trainees out. Like I say, I don't know it all, no one does. But we can all do our part to pass on skills to the next generation.
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Great content Faultless! This is exactly whats been needed for awhile now...proper step by step approach and actually using the up-to-date..."Electricians Bible" 🙏 The format is spot on...I'm currently studying up to become an Approved Electrician...very helpful video m8....Keep up the good work!
Very well explained
Nice video mate, looking forward to more of your content. 👌
Great vid. Looking forward to the next. Thanks for putting the time in.. really useful stuff.
Thank you for a excellent video. Very helpful
Hey john, i just finished my level 3 and I am starting on my nvq these explanations are great, really helpful keep them coming 👍
@laurencebarker7169 cheers mate 👊
loving these videos john as a 2nd year apprentice its a good help to get a head of my learning interms of inspection and testing very grey area for me
@MitchTheApprentice cheers mate, good to hear you're trying to get ahead 👍
Great video John. I was also under the assumption that the bonding readings had to be 0.05 or below but as you said I couldn’t find this anywhere in the regs book itself.
When I did my 2391 the tutor asked this exact question and I answered 0.05, he said that wasn’t technically correct and that it just had to have a low enough resistance reading to allow current to flow in the event of a fault. I thought this was quite vague though to be fair as what is defined as a low enough reading for a main protective bonding conductor 😂 a definitive value would be something that should maybe be introduced in the new amendments 🤔
Brilliant content as always well done John
From my understanding the figure 0.05 is from GN3 and refers to the maximum resitance between the earth clamp and the associated pipework.
So you would test between the earth clamp and the pipework it is clamped too, this resistance figure must be no greater than 0.05. This ensures the clamp is making a good connection to the pipework. Many instances earth clamps have been clamped to painted pipework and do not make a good connection. Hence a high reading.
The resistance of the bonding cable has no maximum value that I know of. As long as the CSA is compliant with the relevant tables within the regs book.
That's an interesting view on it from the IET. It makes sense to confirm the connection is good. However, if the bonding conductor is in the clamp, the reading would be good regardless due to the link at the boiler. Does the bonding have to be disconnected? Also, how far away does the clamp have to be on the pipe? It's such a tough one for spark as the potential problem very seldom happens. The old boys that taught me made a really big deal out of it but I always saw it as a chore. Especially supplementary bonding 🥲 such a pain.
0.05 is the expected test results in Guidance Note 3.
Figure 2.16
Look above this figure - it gives lengths of cable where 0.05 is expected.
Turn the page to expected test results.
"For joints across bonds by earth clamps and similar, the readings should approach 0.05"
John......dont stop......lovin the vids
Amazing content John
Very good.
The 0.05 reading is from guidance note 3!
The "gas" pipe is unlikely to become live from internal influences is it? Do you bond TV aerial cables, telephone cables, cable tv connections?
@@timballam3675 Hi mate, I'm not sure the point you're trying to make? Care to elaborate?
bonding 0.05ohms number Chinese from 16th edition of wiring regs
What type of snorkeling equipment is that
0.02 safe touch voltage 50 voltage
Does it all become easy to remember all these regs. after a few years? I'm not a spark, but I'm just interested in everything you must do and remember.
@ianlove3 you can't remember it all. More and more sinks in as the years go by and experience kicks in. We're all constantly learning and refreshing our knowledge 👍
Jesus. If a 6mm is getting hot I think you’ve got a bigger problem if that’s your earth. How much current would you be putting to earth to make a 6mm hot?
@@davideyres955 It's not so much the current as the path. On a PME system, if a PEN conuctor is lost or at a high resistance, then the current would flow down the services. The services might not be the greatest path to earth and, if there's a PEN fault there's a potential for neutral currents from other properties to be diverted down the services! So they can get rather hot! Diverted neutral current can be a very dangerous.