Real Life Customer Enquirer

[Pete999]

R1+R2 for all earthed points on all circuits, check bonding on all extraneous conductive parts (continuity not above 0.05Ω).

If lighting circuits are unearthed I would be tempted to ensure no fittings requiring an earth are present, although this is more in the scope of an ECIR.

Have you been reading GN3???? LOL your 0.05ohms that referring to the https://www.youtube.com/watch?v=v38PfIVy2rIextraneous parts is it? https://www.youtube.com/watch?v=rnvNfI__kYU
Check these out

 

[flex_m]

I really want it but I can't justify spending £25 on it when it's gonna get updated before I actually need it!

I've been thinking I should just bite the bullet, but I remember a thread on here not long ago about dodgy copies from amazon.

Was my answer OK then?

 

[Pete999]

I really want it but I can't justify spending £25 on it when it's gonna get updated before I actually need it!

I've been thinking I should just bite the bullet, but I remember a thread on here not long ago about dodgy copies from amazon.

Was my answer OK then?

I think your 0.05 ohms is referring to the main protective bonding conductors, check out the two vids I sent you that will clear up your answer I hope. The figure for extraneous metalwork is 2200 ohms or 0.02 megohms, the vids will explain better that I can

 

[pennychew]

Have you been reading GN3???? LOL your 0.05ohms that referring to the https://www.youtube.com/watch?v=v38PfIVy2rIextraneous parts is it? https://www.youtube.com/watch?v=rnvNfI__kYU
Check these out

Those vids are really good,I've watched the whole series of them a few times over now and would definitely recommend them[emoji106]

 

[Bobster]

Borrowed neutrals?

 

[flex_m]

Nice one! Yeah the 0.05 I was talking about was for the bonding conductors, I thought supplementary bonding was no longer needed with the 17th edition, I wont be forgetting the 23,000 figure anytime soon.

Surely plumbers replacing metal for plastic in the property often changes the necessity of supplementary bonding? When would you check if it is needed, because I have to say I don't think I've ever seen it carried out during an ECIR or before a board change....

 

[Pete999]

Nice one! Yeah the 0.05 I was talking about was for the bonding conductors, I thought supplementary bonding was no longer needed with the 17th edition, I wont be forgetting the 23,000 figure anytime soon.

Surely plumbers replacing metal for plastic in the property often changes the necessity of supplementary bonding? When would you check if it is needed, because I have to say I don't think I've ever seen it carried out during an ECIR or before a board change....

Well glad it helped, the testing isn't that hard to do and not very time consuming

 

[pennychew]

Nice to have such good mates isn't it?

Trev has helped me out a couple of times in the past, just returning the favour and I know he'll look after it

 

[Simonslimline]

Borrowed neutrals?

See post 28

 

[Bobster]

See post 28

That'll teach me for skim reading.

Now I seem to have forgotten. How do you test for a borrowed neutral?

 

[pennychew]

That'll teach me for skim reading.

Now I seem to have forgotten. How do you test for a borrowed neutral?

To be totally honest with you I'm going to have to search to find this out as it's not something I know... I understand what a borrowed neutral is and why you have to test for one but never actually done it!

 

[trev]

Testing for BNs is pretty simple mate, not much different from an end to end test on an RFC only you're wanting high resistances between the neutrals. Test between a disconnected neutral and those still connected to the bar, reconnect the one just tested then rinse and repeat till you've gotten through them all.

 

[Simonslimline]

Testing for BNs is pretty simple mate, not much different from an end to end test on an RCF only you're wanting high resistances between the neutrals. Test between a disconnected neutral and those still connected to the bar, reconnect the one just tested then rinse and repeat till you've gotten through them all.

On a lighting circuit you could also test between the Line feeding the circuit & each of the other neutrals at the board. Lamps in switches closed, IR test at 250V. If your'e reading is not clear then there is a connection with the neutrals.

 

[trev]

Although BNs are most common on lighting circuits I have seen them tapped off other circuits, even when it's been easier to do the job properly. It just goes to prove, you should never underestimate the ingenuity of an idiot.

 

[telectrix]

On a lighting circuit you could also test between the Line feeding the circuit & each of the other neutrals at the board. Lamps in switches closed, IR test at 250V. If your'e reading is not clear then there is a connection with the neutrals.

Can someone please confirm this is correct as i am not quite 100% sure TBH.

yes, that's a way. you could also do a cont. test. that should read the resistance of the lamps. switching lamps off individually should give you higher readings.

 

[Simonslimline]

yes, that's a way. you could also do a cont. test. that should read the resistance of the lamps. switching lamps off individually should give you higher readings.

And i am guessing the method i described is dependant on the type of lamps in circuit. Would fluorescents cause a problem perhaps?

 

[Simonslimline]

yes, that's a way. you could also do a cont. test. that should read the resistance of the lamps. switching lamps off individually should give you higher readings.

IE, Parallel resistors

 

[Paul.M]

I've been in contact with the customer. Landlord is one issue, dont start getting into that side of things just yet, work on the electrical bit for now.

Basically the father in-law has noticed a few things (as per his PM) and would like a professional opinion on it all without being harsh/too hard on the landlord.

I'm going around on Saturday to do......... hang fire, you tell me what I should be looking for on a quick 1 hour (free of charge but he makes a good cuppa) quotation.

Loads have been said so far. No one has picked up on the fact that he has changed socket fronts and light fittings. These need to be tested for continuous cpc/earth. He is more than adequate to do these DIY changes but without test equipment and knowing what the readings are, are they safe? Thats down to us to test and judge.

Happily surprised that this thread is on page 5 in a day!!! Told you all that there is a lot to think about. Posting back on Saturday night should be fun and informative

ps, some great responses so far.

 

[Paul.M]

@ Northstar. Your watching this thread atm. How about coming over on Saturday and looking at this yourself? Brilliant experience for your up and coming 2394/5 in the real world. A test rig in a workshop will be a piece of PPPP after this little number. Give me a call if you can make it at noon Saturday.

Afterwards if you want, we can do a little job in a restaurant/take away (very good btw) and have a free meal! You will be more than welcome on both jobs by myself and the customers.

Up to you my friend.

 

[Pete999]

@ Northstar. Your watching this thread atm. How about coming over on Saturday and looking at this yourself? Brilliant experience for your up and coming 2394/5 in the real world. A test rig in a workshop will be a piece of PPPP after this little number. Give me a call if you can make it at noon Saturday.

Afterwards if you want, we can do a little job in a restaurant/take away (very good btw) and have a free meal! You will be more than welcome on both jobs by myself and the customers.

Up to you my friend.

Go for it mate I would free lessons and a meal to boot no contest