Grounding Electrode Conductor Size Verification Checklist PDF

Full QC Checklist+

Verify conductor and system inputs, electrode type and connection, Table 250.66 application and caps, and installation code compliance.

✓21 Inspection Points

✓4 Verification Categories

✓Conductor & System Inputs+

Largest ungrounded conductor size confirmed from the panel schedule or as-built drawings
Conductor material confirmed as copper or aluminum, matching the actual installed conductors
Parallel conductor sets converted to total equivalent area before selecting a size
Effective ground-fault current path confirmed end-to-end, not just the electrode connection
Local code edition and any local amendments confirmed before finalizing

✓Electrode Type & Connection+

Electrode type correctly identified before applying any electrode-specific cap
NEC 250.53 minimum electrode requirements met for the electrode type selected
All electrodes present at the building bonded together into one grounding electrode system
Listed grounding clamp or connector rated for the conductor material and installation condition used
Exothermic weld or listed mechanical connector used at any inaccessible connection point
Electrode effectiveness (soil condition, moisture, electrode length/depth) considered, not assumed adequate from conductor sizing alone

✓Table 250.66 Application & Caps+

Correct Table 250.66 row read for the actual conductor material
6 AWG copper / 4 AWG aluminum rod/pipe/plate cap applied only when it is genuinely the sole connection
4 AWG copper concrete-encased electrode cap applied correctly
Ground ring conductor itself sized at least 2 AWG copper, and the GEC matches it
Aluminum GEC not used in direct earth or masonry contact, or within 18 in. of earth

✓Installation & Code Compliance+

GEC protected from physical damage, or upsized/enclosed where exposed
GEC connections kept accessible, except where an exception specifically applies
Any GEC splice made only by an irreversible method or a connector listed for the purpose
Permit and inspection requirements confirmed for the scope of grounding/service work
Service/system grounding work reviewed or performed by a licensed electrician

Inspection Notes+

Use the latest approved drawings, specifications, and site measurements.

Complete all critical checks before proceeding to the next work stage.

Record deviations and confirm rectification where required.

Inspection Notes

Use the latest approved drawings, specifications, and site measurements.

Complete all critical checks before proceeding to the next work stage.

Record deviations and confirm rectification where required.

Use it after collecting the project inputs and again before approving or closing the relevant work stage.

No. It supports verification but does not replace approved drawings, specifications, codes, manufacturer requirements, or professional inspection.