TryBuildCalc

Circuit Breaker Sizing Verification Checklist

Essential Checklist+

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

✓13 Inspection Points
✓4 Verification Categories
✓Load Classification+
  • Load current confirmed from equipment nameplate, not estimated
  • Continuous vs. non-continuous classification confirmed for every individual load, not applied as one blanket assumption
  • Loads entered in Multiple Loads mode genuinely share one physical circuit/breaker
  • No informal "diversity" or simultaneous-use reduction applied to a single branch circuit's load
✓Formula Application+
  • 125% continuous-load factor applied per load, then summed — not applied once to a pre-summed raw total
  • Final breaker size confirmed as a genuine NEC 240.6(A) standard rating, rounded up
  • Single-phase vs. three-phase confirmed against the actual service/panel
✓GFCI/AFCI Protection Requirements+
  • Circuit location selected matches the actual room/area the circuit will serve
  • Combination AFCI/GFCI (dual-function) breaker specified where a location requires both protections
  • Local code edition and amendments checked for GFCI/AFCI requirements, not assumed from a general reference
✓Wire Cross-Check & Code Compliance+
  • Recommended breaker checked against the actual wire size being installed, not assumed automatically compatible
  • Permit and inspection requirements confirmed for the scope of work
  • Work beyond a simple single-circuit breaker check reviewed or performed by a licensed electrician
Full QC Checklist+

Verify load classification, formula application, GFCI/AFCI protection requirements, and wire/code compliance.

✓20 Inspection Points
✓4 Verification Categories
✓Load Classification+
  • Load current confirmed from equipment nameplate, not estimated
  • Continuous vs. non-continuous classification confirmed for every individual load, not applied as one blanket assumption
  • Loads entered in Multiple Loads mode genuinely share one physical circuit/breaker
  • Power factor entered correctly when sizing from a wattage nameplate rating on a motor or reactive load
  • No informal "diversity" or simultaneous-use reduction applied to a single branch circuit's load
✓Formula Application+
  • 125% continuous-load factor applied per load, then summed — not applied once to a pre-summed raw total
  • Final breaker size confirmed as a genuine NEC 240.6(A) standard rating, rounded up
  • Circuit configuration (line-to-neutral vs. line-to-line) confirmed, not assumed from voltage alone
  • Single-phase vs. three-phase confirmed against the actual service/panel
  • HACR-rated breaker specified for air conditioning, heat pump, or refrigeration compressor loads
✓GFCI/AFCI Protection Requirements+
  • Circuit location selected matches the actual room/area the circuit will serve
  • Method of providing required GFCI protection clarified — breaker-type GFCI vs. GFCI receptacle
  • Combination AFCI/GFCI (dual-function) breaker specified where a location requires both protections
  • Local code edition and amendments checked for GFCI/AFCI requirements, not assumed from a general reference
  • Weatherproof in-use cover confirmed for outdoor or wet-location receptacles, alongside GFCI protection
✓Wire Cross-Check & Code Compliance+
  • Recommended breaker checked against the actual wire size being installed, not assumed automatically compatible
  • Breaker's interrupting (AIC) rating confirmed adequate for the available fault current at its location
  • An existing installed breaker re-verified against actual current load, not assumed correctly sized because it's already installed
  • Permit and inspection requirements confirmed for the scope of work
  • Work beyond a simple single-circuit breaker check 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

Circuit Breaker Sizing 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.