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Earthing- Strip or round conductor electrodes

04/17/2022 6:24 AM

Hello everyone

in BS 7430 9.5.5 pages 45-46 they gave the formula to calculate the resistance of Strip or round conductor electrodes

Could anyone please provide me with the shape (picture or video) of this strip or round conductor electrodes because I didn't understand how this earthing system is made in real life

Thanks

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#1

Re: Earthing- Strip or round conductor electrodes

04/17/2022 6:56 AM

Exactly as you'd imagine a STRIP

Or ROUND

conductor to be

The difference in area in contact with the soil is taken care of by the last term in the list: x

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#2
In reply to #1

Re: Earthing- Strip or round conductor electrodes

04/17/2022 7:19 AM

Thank you so much but in what way we should use these items to make an earthing system that is mentioned in the BS 7430 9.5.5 just do we need to put them in the soil or what ?

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#3
In reply to #2

Re: Earthing- Strip or round conductor electrodes

04/17/2022 7:59 AM

"do we need to put them in the soil"

Exactly, "earth" is called earth for a reason.

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#4
In reply to #3

Re: Earthing- Strip or round conductor electrodes

04/17/2022 9:46 AM

If I understand you very well we should deal with them like rod electrodes but they have their own equation, as it's shown in the below picture

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#5

Re: Earthing- Strip or round conductor electrodes

04/17/2022 11:11 AM

The grounding rod should be driven into the ground. Its sphere of influence is roughly a cylinder the length of the rod and a hemisphere off the bottom of the rod as shown below. If the ground resistance is too high, another ground rod can be used, driven at a distance such that the sphere of influence does not overlap with that of existing rods.

See: https://blog.esgrounding.com/which-ground-or-earthing-rod

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#6

Re: Earthing- Strip or round conductor electrodes

04/17/2022 11:36 AM

You got straps or rods or wires...

....it's just a path to ground for misdirected electricity...to avoid shocks to those standing around...so it should be large enough to handle the expected current under certain circumstances..

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#7

Re: Earthing- Strip or round conductor electrodes

04/18/2022 2:43 AM

The earthing strips we use here are a copper sheathed steel rod, not solid copper.

The steel provides rigidity so the earth stakes can be driven into the ground. Some come with a hole in the end to which a point can be fastened and then a steel pin and copper sleeve can be used to join several lengths together. I have driven some of these 3m 10ft sections into the ground up to 30m 100ft.

The copper conductor is then clamped to the earth rod or else they are joined using a graphite mold and a thermite mixture.Flat copper is used to connect the earth mat to the legs of switchgear towers.

Did an earth mat for a power station once where the earth rods and interconnector strips had to be steel because of the cathodic implications of dissimilar metals. The earth rods and strips were buried in the ground on a 1m x 1m grid and the connections were stick welded together.

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#8

Re: Earthing- Strip or round conductor electrodes

04/18/2022 3:03 AM

IEEE Guide for Safety in AC Substation Grounding Std 80-2000 has a lot of the practical information regarding the design & installation of grounding grids, also.

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#9

Re: Earthing- Strip or round conductor electrodes

04/19/2022 4:38 AM

The reality of earthing systems sometimes defies the application of formulae. Variables include the nature of the soil into which the electrodes are driven, the proximity of local water courses, local rainfall, saline ingress, etc.

The usual technique to lower the earth resistance to an acceptable value, which will be determined by local standards and the design of the protection equipment, is to drive more electrodes at significant spacing.

If in doubt, consult a local qualified Electrical Engineer.

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#10

Re: Earthing- Strip or round conductor electrodes

04/19/2022 6:15 AM

Bing (other search engines are available) can come up with any number of images

earth rod - Bing images

Videos are available on Youtube (not an endorsement), for example:

Earth Electrodes Part 1

Earth Electrodes Part 2 - Installing, Loop Impedance Testing

Earth Electrodes - 3 Wire Testing Example (Part 3)

Youtube earth rods - Bing video

Etc.

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