Ground Resistance Fall-of-Potential Test Record
Record three-point fall-of-potential ground resistance tests with setup, soil conditions, readings, and pass/fail notes in one place. Use it to document IEEE 81-style field testing and NEC 250.56 acceptance checks without missing critical details.
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Overview
This template records a three-point fall-of-potential ground resistance test for a grounding electrode system. It is built to capture the details that matter in the field: inspection date and time, test location, qualified inspector, safety preconditions, equipment calibration, lead condition, probe spacing, soil resistivity, moisture, recent site disturbance, measured resistance, and the final acceptance decision.
Use it when you need a defensible ground resistance reading for commissioning, preventive maintenance, troubleshooting, or post-repair verification. The template is especially useful when the site has variable soil conditions, multiple electrodes, or a need to compare readings over time. It also helps document whether the grounding system meets the site criterion or a NEC 250.56-based acceptance target where that applies.
Do not use this as a substitute for a full electrical safety procedure, a bonding continuity check, or a design calculation. If the electrode cannot be isolated from parallel paths, if the test area cannot be controlled, or if weather and soil conditions make the reading unreliable, the record should note the limitation rather than forcing a pass/fail result. The template is meant to produce a clear field record that shows how the test was performed, what was measured, and what corrective action is needed when the result is outside criteria.
Standards & compliance context
- The template supports documentation aligned with IEEE 81 field testing practices for ground resistance measurement.
- The acceptance field can be tied to NEC grounding expectations, including site criteria based on NEC 250.56 where applicable.
- Safety preconditions should reflect OSHA electrical safety requirements and the facility’s lockout-tagout or energized work controls when isolation is required.
- If the site is part of a broader electrical safety program, the record can support ANSI/ASSP Z10-style management of corrective actions and verification.
- For regulated facilities, retain the completed record as part of the maintenance file so auditors can trace the test method, result, and follow-up action.
General regulatory context for orientation only — verify current requirements with counsel or the relevant agency before relying on this template for compliance.
What's inside this template
Inspection Details
This section identifies what was tested, when it was tested, and who performed the work so the record can be traced later.
- Inspection date and time recorded
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Test location and grounding system identified
Record facility name, building/area, grounding electrode system identifier, and test point location.
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Inspector is qualified to perform electrical testing
Confirm the tester is a competent person or otherwise authorized by site procedure.
Safety and Test Preconditions
This section confirms the area was controlled and the test could be performed safely without exposing people or equipment to avoidable risk.
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Work area controlled and hazards identified
Verify access control, trip hazards, traffic exposure, and any energized equipment hazards near the test route.
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Appropriate PPE worn
Select all PPE used for the task.
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Test area de-energized or isolated as required by procedure
Confirm the grounding electrode system and connected equipment are isolated per site procedure before testing.
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Weather and surface conditions noted
Record ambient temperature, precipitation, recent rainfall, and soil condition because they can affect readings.
Test Equipment and Setup
This section proves the test method was set up correctly, which is essential for trusting the resistance reading.
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Ground resistance tester identified and calibrated
Record meter make, model, serial number, and calibration due date.
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Auxiliary current and potential leads inspected
Verify leads are intact, properly connected, and long enough for the planned probe spacing.
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Ground electrode isolated from parallel paths
Confirm bonding jumpers, neutral connections, and parallel grounding paths were disconnected as required for a valid fall-of-potential test.
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Probe spacing established and documented
Enter the distance from the ground electrode to the current probe and potential probe positions.
Soil Resistivity and Site Conditions
This section captures environmental factors that can change the result and explain why readings vary between seasons or locations.
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Soil resistivity measured or referenced
Enter the measured soil resistivity used to interpret the ground resistance result, if available.
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Soil moisture condition documented
Select the observed soil condition at the time of test.
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Recent site disturbances noted
Document whether excavation, backfill, paving, or utility work may have affected the grounding system or soil conditions.
Test Results and Acceptance
This section records the actual measurement, the acceptance decision, and any anomalies that affect whether the result is valid.
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Fall-of-potential resistance reading recorded
Enter the final ground resistance value obtained from the three-point fall-of-potential test.
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Acceptance criterion met per site or NEC 250.56 requirement
Confirm the measured resistance meets the applicable acceptance criterion used by the facility.
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Multiple readings taken to verify plateau or stable curve
Confirm readings were taken at more than one probe position to verify a stable fall-of-potential curve.
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Measurement notes and anomalies documented
Record any unstable readings, interference, nearby buried metal, or other factors affecting test validity.
Deficiencies, Corrective Actions, and Sign-Off
This section turns the test into an actionable maintenance record by assigning follow-up work and documenting final accountability.
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Deficiencies identified
Indicate whether any non-conformance, defect, or abnormal condition was observed during the inspection.
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Corrective action documented for each deficiency
Describe corrective actions, retest requirements, or escalation to the AHJ or responsible electrical authority.
- Inspector signature
How to use this template
- Enter the inspection date, test location, grounding system identifier, and the name of the qualified person performing the test.
- Record the safety controls in place, including work-area isolation, PPE, de-energization or isolation status, and weather or surface conditions.
- Document the tester model, calibration status, lead inspection, electrode isolation from parallel paths, and the probe spacing used for the fall-of-potential setup.
- Capture soil resistivity or site condition notes, including moisture level and any recent excavation, grading, or backfill that could affect the reading.
- Record multiple resistance readings, note whether the curve plateaued or stabilized, compare the result to the site criterion or NEC-based acceptance target, and list any deficiencies with corrective actions before sign-off.
Best practices
- Isolate the grounding electrode from parallel paths before starting the test, or clearly note any condition that prevents a valid fall-of-potential reading.
- Verify the ground resistance tester calibration status and inspect auxiliary leads for damage, loose connections, or excessive resistance before use.
- Measure and document probe spacing exactly as set in the field, because incorrect spacing can flatten or distort the curve and produce a misleading result.
- Record soil moisture, recent rainfall, and recent excavation or backfill work, since these conditions can change the reading significantly.
- Take multiple readings and look for a stable plateau rather than relying on a single number that may reflect probe placement error or site noise.
- Photograph the test layout, probe locations, and cable routing when the site is complex or when the reading may be questioned later.
- Flag any inability to de-energize, isolate, or control the area as a deficiency instead of treating the test as fully valid.
What this template typically catches
Issues teams running this template most often surface in practice:
Common use cases
Frequently asked questions
What is this template used for?
This template is used to document ground electrode resistance testing with the three-point fall-of-potential method. It captures the test location, equipment setup, soil conditions, measured resistance, and any deficiencies or corrective actions. It is designed for field records, maintenance logs, and compliance documentation.
When should I use a fall-of-potential test record instead of a simple continuity check?
Use this record when you need an actual ground resistance measurement, not just a bond or continuity verification. It is appropriate after installation, after repairs, during periodic electrical maintenance, or when investigating nuisance trips or lightning-related concerns. A continuity check alone will not show whether the grounding electrode system has acceptable resistance to earth.
Who should complete this template?
A qualified person with electrical testing experience should complete it, ideally someone familiar with IEEE 81 field methods and site safety controls. The inspector should be able to isolate the grounding electrode, place auxiliary probes correctly, and interpret the reading curve or plateau. If the site has energized equipment or complex grounding paths, the work should be assigned under the facility’s electrical safety procedure.
How often should ground resistance testing be performed?
The cadence depends on the site’s maintenance program, risk profile, and any applicable owner or insurer requirements. Many facilities test after installation, after major site changes, after lightning or fault events, and on a scheduled preventive maintenance basis. This template helps you keep the interval and results consistent from one test cycle to the next.
Does this template align with OSHA or NEC requirements?
It supports documentation for electrical safety programs and grounding evaluations, but it does not replace a site-specific engineering judgment or code review. The acceptance field can be aligned to NEC 250.56 where applicable, while the test method and setup notes support IEEE 81 practices. OSHA and NFPA-based safety controls should still govern how the work is performed.
What are the most common mistakes this record helps prevent?
Common mistakes include failing to isolate parallel ground paths, using incorrect probe spacing, skipping calibration checks, and recording only one reading when the curve is unstable. Another frequent issue is omitting soil moisture or recent excavation notes, which makes the result hard to interpret later. This template prompts the inspector to capture the context needed to defend the reading.
Can I customize this for substations, commercial buildings, or industrial plants?
Yes. You can tailor the acceptance criterion, add asset tags, include site-specific probe spacing rules, and expand the corrective action section for your maintenance workflow. Facilities with sensitive equipment, lightning protection systems, or multiple grounding electrodes often add extra notes for parallel paths and seasonal soil conditions.
How does this compare with an ad-hoc field note or spreadsheet?
An ad-hoc note often misses the details needed to reproduce or defend the test later, especially probe spacing, isolation steps, and environmental conditions. This template standardizes the record so different inspectors capture the same critical data. That makes trend review, audits, and corrective action tracking much easier.
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