Chart

Ground resistance test method selector map

Map ground resistance test method decision gates such as electrode isolation, stake distance, clamp access, and return path.

Chart boundary

Does not certify an electrode, set an acceptance value, replace test equipment instructions, or approve grounding design.

selection tree

Test method selection path

Choose the next method reference by site access, electrode isolation, and whether auxiliary stakes can be placed.

Scopegrounding and testingX-axissite access questionY-axismethod routeReviewAnnualNextGround test probe spacing calculator
Test method selection pathsite access questionmethod route1Electrode isol...yes / no2Stake placementavailable distance?3Clamp accessconductor reachable?4Method limitationinstrument manualIsolated + stakesfall-of-potentialMulti-ground + clampselectiveReturn loop presentclamp-onLimited sitestakeless screen
Choose the next method reference by site access, electrode isolation, and whether auxiliary stakes can be placed.
site access questionElectrode isolation

Isolation changes method suitability.

yesfall-of-potential

Use probe spacing calculator.

Isolated + stakes
no / parallel pathsselective

Use tester method notes.

Multi-ground + clamp
no stakesclamp-on

Not valid for every electrode.

Return loop present
unclearstakeless screen

Method assumptions can fail.

Limited site

Decision reference

Show the site-condition decision path before users open the ground resistance methods table or calculate probe spacing.

Reference basis: Fluke and AEMC earth ground testing method guides.
MethodBest fitWatch pointHandoff
Isolation gateElectrode can be disconnected and auxiliary stakes can be placedProbe spacing and soil pathsProbe spacing calculator
No isolation gateMulti-ground system where a clamp plus stakes may reduce disconnection needsInstrument compatibility and parallel pathsMethod table
No stake distance gateLooped system where clamp-on or stakeless screening might be possibleNot valid for every electrodeTester manual
Failed condition gateAccess, return path, or equipment assumptions are unclearMethod assumptions can failQualified test plan

Use notes

  • Use this chart as a planning and conversation aid only.
  • Confirm current utility requirements, product markings, manufacturer instructions, and local authority requirements before field work.
  • Use the linked calculator or table when the task needs project-specific arithmetic.

Reference sources

Open the underlying public references before treating the chart as project guidance.