{"id":100120,"date":"2026-02-15T20:18:53","date_gmt":"2026-02-15T20:18:53","guid":{"rendered":"https:\/\/vibromera.eu\/?post_type=calculator&#038;p=100120"},"modified":"2026-07-12T11:16:39","modified_gmt":"2026-07-12T11:16:39","slug":"grounding-calculator","status":"publish","type":"calculator","link":"https:\/\/vibromera.eu\/hi\/calculators\/grounding-calculator\/","title":{"rendered":"Documented Ground-Resistance Measurement Comparator"},"content":{"rendered":"\r\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"WebApplication\",\"name\":\"Documented Ground-Resistance Measurement Comparator\",\"description\":\"Compare a measured grounding-system resistance or impedance magnitude with a documented project limit. No universal safety threshold or parallel-rod model.\",\"url\":\"https:\/\/vibromera.eu\/calculators\/grounding-calculator\/\",\"applicationCategory\":\"Engineering Calculator\",\"operatingSystem\":\"Any (Web Browser)\",\"offers\":{\"@type\":\"Offer\",\"price\":\"0\",\"priceCurrency\":\"EUR\"},\"creator\":{\"@type\":\"Organization\",\"name\":\"Vibromera\",\"url\":\"https:\/\/vibromera.eu\/\"},\"dateModified\":\"2026-07-12\",\"inLanguage\":\"en\",\"isAccessibleForFree\":true}<\/script>\r\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Is 25 ohms a universal safe grounding resistance?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. NFPA public material presents 25 ohms in the specific NEC supplemental-electrode exception for one rod,pipe or plate electrode;it is not a universal safety verdict.\"}},{\"@type\":\"Question\",\"name\":\"Does low resistance alone prove a safe substation grid?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. Fault current distribution,clearing time,soil model,geometry and permissible touch and step voltages must also be evaluated under the governing design basis.\"}},{\"@type\":\"Question\",\"name\":\"Which IEEE measurement guide is current?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"IEEE lists IEEE 81-2025 as the active guide for measuring earth resistivity,ground impedance and earth-surface potentials.\"}}]}<\/script>\r\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"BreadcrumbList\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/vibromera.eu\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Calculators\",\"item\":\"https:\/\/vibromera.eu\/calculators\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Ground-resistance measurement 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grounding test comparison<\/p><h1 class=\"vc-header-title\">Documented Ground-Resistance Measurement Comparator<\/h1><p class=\"vc-header-subtitle\">Compare a measured grounding-system resistance or impedance magnitude with a documented project limit for the same test configuration. No universal 1\/5\/25\u03a9 safety threshold is supplied.<\/p><div class=\"vc-badges\"><span class=\"vc-badge\">IEEE 81-2025 measurement context<\/span><span class=\"vc-badge\">No parallel-rod estimate<\/span><span class=\"vc-badge\">No safety verdict<\/span><\/div><\/header><div class=\"vc-card\"><form class=\"vc-form\" id=\"vc-form\" autocomplete=\"off\"><div class=\"vc-doc-grid\"><div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-id\">Grounding system \/ test identifier<\/label><input class=\"vc-input\" id=\"vc-id\" type=\"text\" maxlength=\"220\"><\/div><div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-basis\">Design\/code basis and edition<\/label><input class=\"vc-input\" id=\"vc-basis\" type=\"text\" maxlength=\"300\"><\/div><div class=\"vc-field vc-wide\"><label class=\"vc-label\" for=\"vc-method\">Test method,frequency,instrument and configuration<\/label><input class=\"vc-input\" id=\"vc-method\" type=\"text\" maxlength=\"360\" placeholder=\"fall-of-potential\/clamp\/selective\/etc.;lead layout and frequency\"><\/div><div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-source\">Measurement record \/ timestamp<\/label><input class=\"vc-input\" id=\"vc-source\" type=\"text\" maxlength=\"260\"><\/div><div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-limit-source\">Limit source and revision<\/label><input class=\"vc-input\" id=\"vc-limit-source\" type=\"text\" maxlength=\"300\"><\/div><div class=\"vc-field vc-wide\"><label class=\"vc-label\" for=\"vc-safety\">Touch\/step\/fault-current study or applicability record<\/label><input class=\"vc-input\" id=\"vc-safety\" type=\"text\" maxlength=\"360\" placeholder=\"approved study\/procedure;explain if not applicable\"><\/div><div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-x\">Measured R\/Z magnitude x<\/label><input class=\"vc-input\" id=\"vc-x\" type=\"text\" inputmode=\"decimal\" maxlength=\"80\"><\/div><div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-x-unit\">Measured unit<\/label><select class=\"vc-select\" id=\"vc-x-unit\"><option value=\"\">Select\u2026<\/option><option value=\"ohm\">\u03a9<\/option><option value=\"mohm\">m\u03a9<\/option><\/select><\/div><div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-limit\">Documented maximum limit L<\/label><input class=\"vc-input\" id=\"vc-limit\" type=\"text\" inputmode=\"decimal\" maxlength=\"80\"><\/div><div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-limit-unit\">Limit unit<\/label><select class=\"vc-select\" id=\"vc-limit-unit\"><option value=\"\">Select\u2026<\/option><option value=\"ohm\">\u03a9<\/option><option value=\"mohm\">m\u03a9<\/option><\/select><\/div><\/div><p id=\"vc-error\" role=\"alert\" style=\"margin:.75rem 0 0;color:#b42318\"><\/p><div class=\"vc-warning-box\"><p style=\"margin:0\"><strong>Applicability gate:<\/strong> x and L must refer to the same quantity,frequency,test method,system configuration and environmental state. Numerical x\u2264L does not prove protection against touch\/step voltage,lightning,transients or faults.<\/p><\/div><\/form><div class=\"vc-results\" id=\"vc-results\" aria-live=\"polite\"><div class=\"vc-results-head\"><h2 class=\"vc-results-title\">Documented test comparison<\/h2><button type=\"button\" class=\"vc-copy-btn\" id=\"vc-copy-btn\">Copy<\/button><\/div><div class=\"vc-result-grid\"><div class=\"vc-rcard vc-rcard-primary\"><div class=\"vc-rcard-label\">Numerical position<\/div><div class=\"vc-rcard-value\" id=\"vc-r-status\">\u2014<\/div><\/div><div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Measured x<\/div><div class=\"vc-rcard-value\" id=\"vc-r-x\">\u2014<\/div><\/div><div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Documented limit L<\/div><div class=\"vc-rcard-value\" id=\"vc-r-limit\">\u2014<\/div><\/div><div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Remaining margin L\u2212x<\/div><div class=\"vc-rcard-value\" id=\"vc-r-margin\">\u2014<\/div><\/div><div class=\"vc-rcard\"><div class=\"vc-rcard-label\">Ratio x\/L<\/div><div class=\"vc-rcard-value\" id=\"vc-r-ratio\">\u2014<\/div><\/div><\/div><p id=\"vc-r-note\" style=\"margin:0;color:var(--vc-ink-secondary)\"><\/p><\/div><\/div>\r\n<div class=\"vc-section vc-open\"><button type=\"button\" class=\"vc-section-toggle\" aria-expanded=\"true\"><span class=\"vc-section-toggle-text\"><span class=\"vc-section-icon\">\ud83d\udcd8<\/span><span class=\"vc-section-title\">Standards,removed model and arithmetic<\/span><\/span><\/button><div class=\"vc-section-body\"><div class=\"vc-section-inner vc-theory\"><h3>Implemented comparison\u2014not an electrode design<\/h3><div class=\"vc-formula-box\">margin=L\u2212x<br>ratio=x\/L<br>x\u2264L \u2192 at or below entered limit; x&gt;L \u2192 above entered limit<\/div><p>1\u03a9=1000m\u03a9 exactly. This is general arithmetic,not an IEEE grounding formula or safety criterion.<\/p><div class=\"vc-nls\"><p><strong>NEEDS_LICENSED_SOURCE:<\/strong> the former single-rod formula was labelled IEEE80 and the multi-rod result used undocumented efficiencies0.58\/0.42\/0.33. Exact geometry\/end-effect assumptions and a validated multi-electrode model require the governing licensed standard or engineering method. They were removed rather than guessed.<\/p><\/div><h3>Measurement and safety standards<\/h3><div class=\"vc-status-grid\"><div class=\"vc-status-card\"><strong>IEEE81-2025<\/strong>Active guide for measuring earth resistivity,ground impedance and earth-surface potentials. Its public scope includes safety,methods,instrumentation limitations and distortion factors.<\/div><div class=\"vc-status-card\"><strong>IEEE80-2013<\/strong>Guide for safety in AC substation grounding;Corrigendum1-2015 was incorporated. A rod-resistance estimate alone is not an IEEE80 safety study.<\/div><\/div><p>Official IEEE record: <a href=\"https:\/\/standards.ieee.org\/ieee\/81\/11218\/\" target=\"_blank\" rel=\"noopener\">IEEE81-2025<\/a>. Licensed access is required for detailed procedures and equations.<\/p><h3>Why 25\u03a9 is not a universal target<\/h3><p>Public NFPA NEC development material states that a single rod,pipe or plate electrode is supplemented unless its resistance to earth is25\u03a9 or less;it also specifies minimum spacing for multiple electrodes and notes that larger spacing improves efficiency. That conditional installation rule is not a universal declaration that25\u03a9 is safe for every facility,system or jurisdiction. The former \u201c&lt;5\u03a9 good \/ &lt;25\u03a9 acceptable \/ &gt;25\u03a9 too high\u201d output was removed.<\/p><h3>Removed assumptions<\/h3><p>The former page assumed homogeneous soil,used generic soil-type ranges as design inputs,substituted spacing=2L when blank,ignored conductor\/contact resistance and seasonal\/layered soil,and replaced an interaction sum with an unrelated efficiency map. It did not evaluate fault current,clearing time,touch\/step potentials or measured uncertainty. Use site measurements and the approved design\/test procedure.<\/p><\/div><\/div><\/div><footer class=\"vc-footer\"><p>\u00a92024\u20132026 <a href=\"https:\/\/vibromera.eu\/\">Vibromera<\/a><\/p><p>Documented measurement comparison only\u2014not grounding design,code compliance or a safety certificate. Scientific review:July2026.<\/p><\/footer><\/div>\r\n<script>(function(){'use strict';function $(i){return document.getElementById(i)}var k={ohm:1,mohm:.001};var outs=['vc-r-status','vc-r-x','vc-r-limit','vc-r-margin','vc-r-ratio'];function num(r){var s=String(r).trim().replace(',','.');if(s.length>80||!\/^[-+]?(?:\\d+(?:\\.\\d*)?|\\.\\d+)(?:[eE][+-]?\\d+)?$\/.test(s))return NaN;return Number(s)}function fmt(v){if(!Number.isFinite(v))return'\u2014';if(v===0)return'0';return Number(v.toPrecision(12)).toString()}function val(v){return fmt(v)+' \u03a9 \/ '+fmt(v*1000)+' m\u03a9'}function clear(){outs.forEach(function(i){$(i).textContent='\u2014'});$('vc-r-note').textContent='';$('vc-results').classList.remove('vc-visible')}function fail(m){clear();$('vc-error').textContent=m}var map={gr_id:'vc-id',gr_basis:'vc-basis',gr_method:'vc-method',gr_source:'vc-source',gr_limit_source:'vc-limit-source',gr_safety:'vc-safety',gr_x:'vc-x',gr_x_unit:'vc-x-unit',gr_limit:'vc-limit',gr_limit_unit:'vc-limit-unit'};function setUrl(){var u=new URL(location);Object.keys(map).forEach(function(q){var v=$(map[q]).value.trim();if(v)u.searchParams.set(q,v);else u.searchParams.delete(q)});history.replaceState(null,'',u.toString())}function calc(){setUrl();var id=$('vc-id').value.trim(),basis=$('vc-basis').value.trim(),method=$('vc-method').value.trim(),source=$('vc-source').value.trim(),ls=$('vc-limit-source').value.trim(),safety=$('vc-safety').value.trim(),xr=$('vc-x').value.trim(),xu=$('vc-x-unit').value,lr=$('vc-limit').value.trim(),lu=$('vc-limit-unit').value,any=Object.keys(map).some(function(q){return $(map[q]).value.trim()});if(!any){clear();$('vc-error').textContent='';return}if(!id||!basis||!method||!source||!ls||!safety||!xr||!xu||!lr||!lu){fail('Enter all system,test,limit,safety,unit and provenance fields.');return}if(!(xu in k)||!(lu in k)){fail('Select a valid unit for measurement and limit.');return}var x=num(xr),l=num(lr);if(!Number.isFinite(x)||x<0){fail('Measured magnitude must be a complete nonnegative decimal number.');return}if(!Number.isFinite(l)||l<=0){fail('Documented maximum limit must be a complete strict positive decimal number.');return}x*=k[xu];l*=k[lu];if(!Number.isFinite(x)||!Number.isFinite(l)||x>1e100||l>1e100){fail('Normalized values must be finite and no greater than10\u00b9\u2070\u2070\u03a9.');return}var m=l-x,r=x\/l;if(!Number.isFinite(m)||!Number.isFinite(r)||Math.abs(m)>1e100||r>1e100){fail('The comparison exceeds the finite numerical range.');return}$('vc-error').textContent='';$('vc-r-status').textContent=x<=l?'At or below entered limit':'Above entered limit';$('vc-r-x').textContent=val(x);$('vc-r-limit').textContent=val(l);$('vc-r-margin').textContent=val(m);$('vc-r-ratio').textContent=fmt(r);$('vc-r-note').textContent='System:'+id+' | Basis:'+basis+' | Test:'+method+' | Record:'+source+' | Limit:'+ls+' | Safety\/applicability:'+safety+' | Numerical comparison only.';$('vc-results').classList.add('vc-visible')}$('vc-form').addEventListener('input',calc);$('vc-form').addEventListener('change',calc);$('vc-copy-btn').addEventListener('click',function(){if(navigator.clipboard)navigator.clipboard.writeText($('vc-results').innerText)});document.querySelectorAll('.vc-section-toggle').forEach(function(b){b.addEventListener('click',function(){var s=this.closest('.vc-section');s.classList.toggle('vc-open');this.setAttribute('aria-expanded',s.classList.contains('vc-open'))})});var q=new URLSearchParams(location.search);Object.keys(map).forEach(function(x){if(q.has(x))$(map[x]).value=q.get(x)});calc()})();<\/script>\r\n","protected":false},"excerpt":{"rendered":"<p>Compare a measured grounding-system resistance or impedance magnitude with a documented project limit. 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