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Equipment Grounding Conductor Size Verification Checklist

Essential Checklist+

Complete these critical checks before approving the work or proceeding to the next construction stage.

✓12 Inspection Points
✓4 Verification Categories
✓Circuit & System Inputs+
  • OCPD (breaker/fuse) rating confirmed from the actual installed device, not assumed from wire size
  • EGC material confirmed as copper or aluminum, matching the actual installed conductor
  • Low-impedance fault-current path confirmed end-to-end, back to the source
  • Local code edition and any local amendments confirmed before finalizing
✓250.122(B) Upsize Check+
  • Upsize reason confirmed as voltage drop or similar — not ambient temperature or conductor-count derating
  • Minimum required ungrounded conductor size correctly determined from ampacity tables, not guessed
  • Actual installed ungrounded conductor size confirmed from the panel schedule or as-built drawings
✓Table 250.122 Application+
  • Correct Table 250.122 row read for the actual OCPD rating and material
  • EGC sized from the OCPD rating, confirmed not to have been sized from conductor ampacity instead
✓Installation & Code Compliance+
  • Where a raceway itself serves as the EGC, its physical continuity and listing confirmed end-to-end
  • Permit and inspection requirements confirmed for the scope of circuit/equipment work
  • Circuit/equipment grounding work reviewed or performed by a licensed electrician
Full QC Checklist+

Verify circuit/system inputs, the 250.122(B) upsize check, Table 250.122 application, and installation/code compliance.

✓20 Inspection Points
✓4 Verification Categories
✓Circuit & System Inputs+
  • OCPD (breaker/fuse) rating confirmed from the actual installed device, not assumed from wire size
  • EGC material confirmed as copper or aluminum, matching the actual installed conductor
  • Wire-type EGC vs. raceway-as-EGC method confirmed for the actual installation
  • Low-impedance fault-current path confirmed end-to-end, back to the source
  • Local code edition and any local amendments confirmed before finalizing
✓250.122(B) Upsize Check+
  • Upsize reason confirmed as voltage drop or similar — not ambient temperature or conductor-count derating
  • Minimum required ungrounded conductor size correctly determined from ampacity tables, not guessed
  • Actual installed ungrounded conductor size confirmed from the panel schedule or as-built drawings
  • Proportional increase rounded up to the next standard conductor size, not left at a non-standard value
  • Final EGC size confirmed not larger than the ungrounded conductor it runs with
✓Table 250.122 Application+
  • Correct Table 250.122 row read for the actual OCPD rating and material
  • EGC sized from the OCPD rating, confirmed not to have been sized from conductor ampacity instead
  • Each parallel raceway confirmed to carry its own full-size EGC, not a divided fraction
  • For OCPD ratings above 6000A, the 12.5%-of-largest-ungrounded-conductor rule applied instead of Table 250.122
  • Terminal and lug ratings confirmed compatible with the final EGC size and material after any upsize
✓Installation & Code Compliance+
  • EGC connections and splices made with a listed connector or an irreversible method
  • Equipment bonding jumper sized correctly where used, matching or exceeding the circuit EGC
  • Where a raceway itself serves as the EGC, its physical continuity and listing confirmed end-to-end
  • Permit and inspection requirements confirmed for the scope of circuit/equipment work
  • Circuit/equipment 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.

Related Calculators & Guides

Equipment Grounding Conductor Size CalculatorOpen the related calculator and verify the current project inputs.

FAQ

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.