TESTING BONDING & EARTH CABLES – WANDER LEADS & CALCULATIONS

Guys, small error on the Adiabatic equations calculation towards end of video.
6mm should be 1090 amps - as it is
10mm should be 1818 amps
and 16mm should be 2909 amps.
Old calculator is now in the bin. Thanks for your understanding. Dave.

We’ve been asked several times recently about wander lead tests and how to test bonding cables properly. So, in this this video from LearnElectrics we will look at testing bonding cables, confirming the continuity of bonding clamps and also a brief look at the current carrying capacity of earth cables.

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Always work safely, electricity can be dangerous. If you are unsure, stop and seek advice.
This video is provided for guidance only. Every electrical situation is different, please check and ensure that you are applying this learning information to your own individual circumstances correctly and safely. If in doubt, stop and seek competent advice.

[Qq-x]

Excellent tutorial as ever from Learn Electrics. Clear, consice instructions and diagrams. Many thanks

[mb-electricalservices]

Good stuff. I generally (on an non-energised installation), disconnect the main protective bonding conductors at the MET individually so as not to pick up any parallel paths. If I'm wrong here, please correct me. 👍

[dominicjames]

Astute! Many thanks for this simplified explanation. Can do an OPL with the various segments of the explanations. Thanks a lot once again.

[richardjohn]

tested this on my house, gas water pipes, with my megger, and worked out nice, made wander lead too, messure its resistance and marked on the roll, had wander round house too and messure earths at sockets, lights,garden shed, pond water fall power point, good stuff to know, love the old school sparks, know there stuff

[gbelectricks]

Great video as always Dave, thanks for sharing👏👍

[shiamjad]

Another great informative video. Please make one for supplementary bonding as well

[kingofthetrowel]

Brilliant stuff again dave 👍👍 an update dave, I’ve enrolled at local college and start in September level 2-3 2365 c&g 👍👍 I cant wait and I’ll probably keep going over your videos as they really are good learning 👌👌 as most have said thank you very much, keep them coming 🙌🏻🙌🏻

[bagpusslxv]

Great video - another video on supplementary EB would be useful as this is often misunderstood leading to unnecessary proliferation of clamps and short green and yellow wires. An explanation of what constitutes simultaneously accessible exposed conducive parts and exposed conducive parts would be great 👍

[azizurrahman]

Dear sir the 16mm calculation not matching the calculation can recalculate and correct that please. Thank you for your video it fantastic and happy new year

[azizurrahman]

dear sir the you calculation 16mm cps its not matching with my calculation can you recalculate or may be some errors I have try your formula but not same answer so I will be happy if explain thank you very nice explain step by step it very helpful . thank you

[AndrewCook]

Hi Dave
Superb videos as alway
Can you do a video as to why we have the bonding conductors 16mm and 10mm.
Why are they that size?

[michaelcostello]

What determines the max fault current that can flow. We calculated the max allowed for a disconnection 0.4 seconds that does not overheat the cable. Is it the prospective fault current ?

[hadesbearer]

If it is difficult to access the bonding clamp, (e.g. hidden in the floor, but appears good visibly) could you also reverse the test by disconnecting all the earthing conductors at the consumer unit bus bar and test the individual earthing cables from the end at the CU to the other end e.g. by a bathroom radiator?

[samanamini]

Hi. can you tell me please, where can i find answer for this question on amedment2 WR book?
an earth busber connected to a 250A per phase supply, must not be thans
1. 50mm2
2.16mm2
3. 10mm2
4. whatever the guidance 54.8 explain
i know its in chaper 54 but i cant find answer. can you give me more information or i have to use calculation form?

[ciaranhughes]

Does a oil boiler incoming pipe need bonded if it comes into outhouse with copper pipe but insulated with white coating at point of entry?
If it does need bonding what size of cable.

[no_short_circuit]

Thanks for the video. My maths isn't what it used to be but I agree with the 6mm answer (1090 amps) but get different answers for 10mm (1818 amps) and 16mm (2909amps). Am I missing something?

[alanmarriott]

Can I ask a question please about size of earth please. How do you choose correct size earth for fly lead from banjo on an swa where armourings are the cpc?? Many thanks

[mohammedborhan]

hi can you please do lesson about emergency light with emergency switch
thank you