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OhmCert2026
Field Testing & Twin SaaS
🇬🇧 Full UI + PDF + National Standard Mapping: UI + PDF in English. Normative references follow international IEC 60364, BS 7671:2018+A2:2022, IEEE, and NFPA 70E/70B.
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#01Earth Resistance & Equipotential Bonding Test Report

Project Framework (report reference): IEC 60364-4-41Applicable Standard: IEC 60364-6
Module Field Guides, Standard Selection & Tutorials (3)Browse All 93+ Guides →
1 · Field Measurement ProcedureHow to Measure & Test Earth Resistance & Bonding on Site: Step-by-Step Field Procedure (IEC 60364-6)2 · Standards & Limit TablesWhich Standard Applies to Earth Resistance & Bonding? Acceptance Limits, Annex Tables & Regional Equivalents (IEC 60364-6)3 · OhmCert Tutorial & Case StudyHow to Complete a Earth Resistance & Bonding Certificate in OhmCert: Worked Case Study & Troubleshooting

Multi-Asset / Multi-Point Equipment Schedule

Inspect multiple transformers, panels, rooms, motors, or RCDs in this module without overwriting previous assets. Each item receives a permanent QR Sticker UID preserved across annual audits.

Sticker UID: OC-EART-F153
Plant & SLD (Auto-SLD)

Standard Limits, Equations & Space Presets

Normative touch voltage limits (UL <= 50 V AC dry / <= 25 V AC wet & medical), seasonal electrode resistance ceilings, and IEEE Std 81 soil resistivity bands.

One-Click Normative Presets (Auto-fills Target Limits)

Measured Inputs

Calculated / Evaluated Results

Pending / Not tested — results stay neutral until valid measured values are entered.

  • Max Permissible Electrode Resistance Ra_max = UL / Ia

    - Ohm

    Calculated for touch voltage limit UL = 50 V AC (50 V dry / 25 V wet-special locations).

    Pending

  • Calculated Touch Voltage U_touch = Ra x Ia

    - V

    Enter Ra and Ia to calculate fault touch voltage.

    Pending

  • Earth Electrode Resistance & Seasonal Stability (Ra)

    -

    Pending: enter measured earth electrode resistance Ra and device operating current Ia.

    Pending

  • Main / Supplementary Equipotential Bonding Continuity

    -

    IEC 60364-6 / BS 7671 GN3: Main protective bonding continuity <= 0.2 Ohm (<= 1.0 Ohm long supplementary runs).

    Pending

  • Wenner 4-Pole Soil Resistivity Classification (rho)

    - Ohm-m

    Not tested - <= 100 Ohm-m: Low resistivity soil - favourable for simple rod/strip earth electrodes. [IEEE Std 81]

    Pending

Verification Checklist (0 / 14)

Pending

  • 1Earth electrode, rod coupler, and conductor clamp free of galvanic corrosion and mechanically tight [IEC 60364-5-54 §542.3]

  • 2Removable test link / disconnecting joint accessible for isolated electrode resistance testing [IEC 60364-5-54 §542.4]

  • 3Main Earthing Terminal (MET) permanently labelled 'Safety Electrical Connection - Do Not Remove' [BS 7671 §514.13]

  • 4Earthing conductor and main protective bonding cross-sections verified against IEC 60364-5-54 Table 54.2

  • 5Main equipotential bonding connected to incoming metallic water, gas, fire-sprinkler, and HVAC services within 600 mm of entry

  • 6Structural steelwork, foundation reinforcement, and metallic cable containment bonded to MET with continuous < 0.2 Ohm continuity

  • 7Lightning Protection System (LPS) earth termination ring interconnected to MET via spark-gap or direct bond per design [IEC 62305-3]

  • 8Wenner 4-pole soil resistivity (rho = 2*pi*a*R) and 61.8% Fall-of-Potential flat-slope plateau verified [IEEE Std 81 §8.2]

  • 9Earth inspection pit cover intact, labelled with electrode ID, free of standing water, and backfilled properly

  • 10Clamp-on / stakeless loop measurement cross-checked to rule out parallel metallic return paths inflating accuracy

  • 11Test leads zeroed / nulled and potential/current spikes placed outside mutual resistance interference zones

  • 12Seasonal moisture variation factor applied to measured RA against year-round worst-case dry soil conditions

  • 13Touch and step voltage compliance verified (or equipotential grading mesh confirmed) around substation fence/perimeter [EN 50522]

  • 14As-built earthing grid layout and historical degradation trend log updated in asset register

General Notes

PDF Certificate Language:

Free plan: 5 of 5 inspections / calculations left this month.