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MCA & MOCP Verification Checklist

Essential Checklist+

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

✓14 Inspection Points
✓4 Verification Categories
✓Equipment & Input Data+
  • Nameplate MCA/MOCP read directly from the actual installed equipment, not estimated
  • Largest motor correctly identified before applying the 125%/175%/225% factors
  • Other motor and non-motor loads correctly summed from all components sharing the circuit
  • Wire material confirmed as copper or aluminum, matching the actual installed conductor
  • Local code edition and any local amendments confirmed before finalizing
✓MCA / MOCP Calculation+
  • MCA's 125% factor applied only to the largest motor, other loads added at 100%
  • MOCP rounding interpretation confirmed with a licensed electrician or AHJ, never exceeding the 225% ceiling
✓Wire & Breaker Selection+
  • Selected wire's (derated) ampacity confirmed to meet or exceed the MCA
  • Selected breaker/fuse size confirmed not to exceed the MOCP
  • Lower of the wire's insulation rating and the terminal/equipment rating used to select the ampacity column
✓Installation & Code Compliance+
  • Equipment grounding conductor sized separately, per NEC Table 250.122, not assumed from the MCA wire size
  • Equipment voltage and phase rating confirmed to match the actual supply before energizing
  • Permit and inspection requirements confirmed for the scope of HVAC electrical work
  • HVAC circuit work reviewed or performed by a licensed electrician or HVAC contractor
Full QC Checklist+

Verify equipment/input data, MCA/MOCP calculation, wire/breaker selection, and installation/code compliance.

✓20 Inspection Points
✓4 Verification Categories
✓Equipment & Input Data+
  • Nameplate MCA/MOCP read directly from the actual installed equipment, not estimated
  • Largest motor correctly identified before applying the 125%/175%/225% factors
  • Other motor and non-motor loads correctly summed from all components sharing the circuit
  • Wire material confirmed as copper or aluminum, matching the actual installed conductor
  • Local code edition and any local amendments confirmed before finalizing
✓MCA / MOCP Calculation+
  • MCA's 125% factor applied only to the largest motor, other loads added at 100%
  • MOCP rounding interpretation confirmed with a licensed electrician or AHJ, never exceeding the 225% ceiling
  • Final MOCP value confirmed as an actual standard NEC 240.6(A) ampere rating
  • From-scratch component-ratings calculation used only when no combined nameplate value exists
  • Calculated MOCP confirmed to actually let the motor start reliably, or the qualified-person exception documented
✓Wire & Breaker Selection+
  • Selected wire's (derated) ampacity confirmed to meet or exceed the MCA
  • Selected breaker/fuse size confirmed not to exceed the MOCP
  • Lower of the wire's insulation rating and the terminal/equipment rating used to select the ampacity column
  • Ambient-temperature and conductor-count derating applied for hot attics, rooftops, or shared conduits
  • Equipment disconnect switch sized and located separately, per NEC 440.14
✓Installation & Code Compliance+
  • Equipment grounding conductor sized separately, per NEC Table 250.122, not assumed from the MCA wire size
  • Outdoor-rated conductors, connectors, and disconnect enclosure used for outdoor condenser/compressor units
  • Equipment voltage and phase rating confirmed to match the actual supply before energizing
  • Permit and inspection requirements confirmed for the scope of HVAC electrical work
  • HVAC circuit work reviewed or performed by a licensed electrician or HVAC contractor
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

MCA & MOCP 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.