Discuss Using rebar as earthing. in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net
I didnt realise that concrete would conduct so well compared to soil.
Thanks.
Its called "Ufer earthing". Concrete is a better conductor of electricity than soil, and it makes sense to insert your earth rod, or mesh (ie rebar) into it. As rebar is used anyway, its silly not to make use of it. The concrete will also have a much greater surface area than a rod or tape. I beleive that lightning can cause the concrete surrounding the rebar to crack, however in this country, this would not put me off.
At work, we install big generators onto concrete plinths, that our company is responsible for providing. The rebar is not bonded down, and we have to use earth rods to tie the genny to ground potential. Im trying to convince the engineer
to use Ufer earthing, as i think it would be more cost effective, and easier.
Ufer earthing works best with a large area of slab/footings. A generator or transformer plinth would in all probability, depending on what depth the plinth is in the ground, need a supplementary earth ring around the plinth. Also depends on what your using as your max Ra value. .....Please tell me it's not 200 ohms??
The engineer wants below 20 ohms, and ive managed 4
The reg. (542.2.3 (v))does say the rebar should be welded.
Does that mean it can only be used if it is planned and intended to be used as an electrode?
Reply to Using rebar as earthing. in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net
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