Ground Electrode Resistance Calculator

How Ground Electrode Resistance works

The numerical relationship is R = V ÷ I. Ground Electrode Resistance uses Test voltage, Measured test current to report Estimated ground resistance.

With the loaded values, estimated ground resistance evaluates to 5.00 Ω. Isolate a single uncertain input during sensitivity checks.

Inputs for Ground Electrode Resistance

Test voltage and Measured test current belong to Ground Electrode Resistance. Keep source units with test voltage.

Replace every example value with data from one documented operating condition.

Test voltage

Example entry: 25 V.

Measured test current

Example entry: 5 A.

Reading the Ground Electrode Resistance result

This output represents Ground Electrode Resistance. Current per conductor belongs in the separate Parallel Conductor Sharing worksheet.

The worksheet isolates arithmetic; final ratings need a broader equipment check.

Measurement and units

Treat these results as planning arithmetic; conductor and protective-device selection must follow the applicable electrical code and equipment instructions. Check prefixes on test voltage. Use Breaker Load Margin Calculator as the follow-up for unused breaker capacity.

Matching units and measurement locations prevent false differences.

Limits of this calculation

Soil moisture and electrode geometry can change the reading. For ground potential rise, use Grounding Voltage Rise Calculator.

The displayed formula isolates the stated electrical quantity. Unentered effects remain outside Ground Electrode Resistance.

A useful Ground Electrode Resistance comparison

Record estimated ground resistance before testing a different test voltage value.

Document the alternate test voltage source.

Ground Electrode Resistance record notes

Record source and operating details for test voltage.

Retain raw estimated ground resistance beside its selected rating.

Questions about Ground Electrode Resistance