Comments on: Earthing system design

By: CHRISMAR

CHRISMAR — Wed, 01 Feb 2012 07:09:21 +0000

Good am fellows.Can anyone know how many meter is the required (distance/by meter) of earthing system installation at the process area pipe rack.As we have already a loop earthing on the pipe rack perimeter but on the structural pipe rack is there any standard?please reply!

By: jarrod

jarrod — Sat, 26 Nov 2011 05:25:08 +0000

I don’t really agree with that as salt is a temporary solution for a lower resistance and increases the corrosion process on the electrodes. The carbon or charcoal as you call it helps increase the area of conductor to ground. For example. If you core drill a 60mm hole and insert a 16mm earth rod into the ground and cover the whole with normal soil, you conductors area to ground is only 16mm. But if you filled that 60mm hole with conductive cement, you have now increased the conductor area to ground to 60mm. This will make a minor diferrence in your resistance when tested, unless the area has been moistened.

By: somnath kundu

somnath kundu — Wed, 28 Sep 2011 17:46:19 +0000

in block mill at the time of full load means materials in the mill the control lights are glowing can u give me any solution?

By: oslec

oslec — Sat, 21 May 2011 05:35:03 +0000

i cant find any grounding stardard with regards to the distance between grounding rod, and the distance of grounding ring from the building.

Hopefully this blog can help me.

By: Nurul Syafiqah Abdullah

Sun, 13 Mar 2011 02:40:11 +0000

thanks for the interesting site…I just wanna know about the position of three electrodes. I’m not sure which of the electrodes should be changed from its actual place, but I just wanna know, why should it moved? Simple, why should the electrodes should be changed?

Regards.

By: Loo Boon Seang

Loo Boon Seang — Sat, 12 Mar 2011 20:33:04 +0000

I want to know how the neutral and ground wires are looped into the earth through copper pipes. How long is the copper pipe needed to be inserted vertically into the earth soil ?
This question applies to a single phase 240Vac supply system at domestic / home…

Looking forward to read from you soon.
Yours sincerely ;
Loo Boon Seang

By: William Bush

William Bush — Mon, 14 Feb 2011 06:43:26 +0000

Interesting thread but has many misleading and misunderstood statements. Very useful practices/codes are IEEE Std 1100-2005, IEEE 142-2007, NFPA 70-2011, NFPA 780-2011. The noted IEC stds are also useful. Generally, the best grounding/earthing for a facility is ONE intergrated grounding electrode system (GES) for all affected entities including power and lightning. Even if lighting has dedicated GES it should be directly bonded to the power GES and the structure GES (if there is one such as a foundation electrode). The intent is to get the entire facility to rise/fall together under transient conditions within the GES. CNC machine providers used to insist on a separate earthing/grounding electrode because they misunderstood the actual problem had to do with the equipment grounding system (ac power wire, etc.). There is much misinformation re grounding for electronic equipment. IEEE Std 1100-2005 is useful and recommends decoupling the ports from grounding dependence via fiber links, optocouplers, digital isolators, etc. Remember, a laptop PC does not need a “ground” to work properly. I’m involved with several stds developments in North America and have considerable exposure and experience on these subjects – theory, application and site work. Good luck.

By: eshwar

eshwar — Sun, 09 Jan 2011 04:28:49 +0000

it is good initiative.Use advance pipe techniques to get max.condutivity path and tes the soil.

By: ankit_chokhani@yahoo.com

ankit_chokhani@yahoo.com — Sat, 08 Jan 2011 09:51:13 +0000

Dear Sir,

Very enlighting write up.
We are having 3 earthings embedded on 3 sides of factory( 50 x45 meters factory bldg). we get voltage differance of 3 to 15 between neutral and these earth point. All earthing in the factory is looped throgh 40×6 mm GI strip.The connected load is 750kva

We have a problem of frequent damage to variable frequency drive and PLC controls.

Some engineer now suggest that we now should have separate earthing embedded in ground for every 3 machines i.e. we install new 12 earthings and take the separate conductor to each set of 3 machines?

Also earthing should be used ALSTOM ?

We request you to suggest.

Ankit Chokhani

By: Spir G. GHALI

Spir G. GHALI — Wed, 22 Dec 2010 15:49:39 +0000

about the connection between ” Earthing System & Lightning Protection ” :
Normally, we should have 2 seperate Earthing Points, 1st is special for LV where the resistance value is ” around 1-3 ohm for NT-S, NT-C, IT “, and the 2nd is special for Lightning System where the resistance value should be ” smaller then 10 ohm “, but in some places ” Closer ” we should connect between them by a ” 25-35 mm2 Copper Conductor ” that we scalled ” Equipotential Conductor “, where the gole is to have the same Potential for both when there’s a Lightning crurrent flows.