Free Earthing Tool

Earthing BOQ Builder

Turn a resistance target (or a pit count) into a complete earthing materials list — GI pipes, salt, charcoal, connecting strip and accessories — then send the whole BOQ as one WhatsApp enquiry. Weights come from the same IS 1239, GEC chart and Dwight data as our standalone calculators.

Defaults to 10 m per pit — edit to your site layout.

Accessories (one per pit)

Engineering check required: This result is indicative only. Verify it with a licensed electrical engineer or electrical consultant.

ItemSpecQtyUnitWeight / Notes

Indicative BOQ for budgeting. Final design (pit count, spacing, conductor size, corrosion allowance) must be confirmed by your design engineer per IS 3043.
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Please read. These figures are general projections, not a design. They are estimates based on published formulae, standard weight data and assumed uniform soil conditions — real sites vary, and the numbers here may not be 100% accurate. They are offered as a working aid only. Global Electric Company accepts no liability for decisions taken on the basis of these results: always have them checked and signed off by your site engineer, electrical consultant or a qualified professional, and confirm earth resistance by measurement on site before commissioning. Where these tools and IS 3043 disagree, IS 3043 wins.

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GI Strip → Copper Strip → Earthing Plates → GI Pipe →

How the earthing BOQ is built

In design mode the builder estimates one pit’s resistance with the Dwight formula, then sizes the pit count to your target:

R₁ = ( ρ ÷ (2πL) ) × ( ln(8L ÷ d) − 1 )
smallest n where F(n) × R₁ ÷ n ≤ target

Then it multiplies the per-pit recipe by n and adds the connecting strip run. Material weights reuse the exact data from our standalone tools: GI pipe from the IS 1239 (Part 1) nominal weight, strip from the Global Electric Company weight chart, and resistance from the Dwight equation. So a figure here matches the corresponding single-purpose calculator for the same inputs.

Why the pit count is higher than R₁ ÷ target. Pits in parallel never reach R ÷ n, because each electrode sits in its neighbours’ resistance field. Sizing off R ÷ n would sell you too few pits and the installation would miss its target on test. We apply a combining factor F(n) and size against the realistic figure instead. Pipe tonnage assumes medium class. Brickwork, chambers, clamps and GI wire are not included.

Frequently asked questions

How many earthing pits do I need?
Estimate one pit’s resistance from soil resistivity and electrode size. Pits in parallel don’t combine as a simple R_single ÷ target — they share the same soil volume, so apply a combining factor and size against the realistic figure. A 3 m × 40 NB pipe in 100 Ω·m soil is about 27.6 Ω, so reaching a 5 Ω target needs about 9 pits (≈ 4.8 Ω), not the 6 that naive R ÷ target suggests. Space pits at least their own length apart and confirm by measurement.
What materials go into one earth pit?
One GI earthing pipe (commonly 40 NB × 3 m), grounding salt and charcoal backfill, a funnel set for watering, an RCC chamber cover, and a bolt-nut set to land the earthing strip. Pits connect back to the main earthing terminal with GI or copper strip.
How much salt and charcoal per earth pit?
A common starting figure is about 25 kg salt and 25 kg charcoal per pit (editable here). So 6 pits need roughly 150 kg of each — adjust for pit size and soil.
How do I prepare an earthing BOQ?
Fix the pit count (from a resistance target or directly), multiply the per-pit recipe by the pit count, add the connecting strip run, and tally pipes, salt, charcoal, strip, funnels, chamber covers and bolt-nut sets. This builder does that and produces a single WhatsApp enquiry. Confirm the final design with your engineer per IS 3043.

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