NEC 2026 — Article 440 · Air-Conditioning & Refrigerating Equipment
Calculator Type
NEC 440.4(B) / 440.12 / 440.22 / 440.32 / 440.33 / 440.34
Load Classification
Select whether this equipment has a single motor-compressor or a combination of loads — this determines which NEC subsections govern all three results below.
Phase
Nameplate Voltage
Motor Design Letter (Table 430.251)
Motor-Compressor Nameplate Data
RLA (A)
BCSC (A)
LRA (A)
Overload Protection Method
Nameplate Overrides (Optional)
If the equipment nameplate is marked with MCA and/or MOCP per NEC 440.4(B), enter them here — the marked value supersedes the computed Conductor/OCPD result.
MCA (A)
MOCP (A)
NEC Tables 310.16/310.17/310.20
Condition of Use
Material
Insulation Rating (Pass 2)
60°C is disabled — motor-compressor branch circuits always require a 75°C-minimum terminal rating.
Ambient Temperature
Conductor Count (CCC)
OCPD Sizing
NEC 440.22 / 440.33
Complete the classification and nameplate data to see this result.
Branch-Circuit Conductor Sizing
NEC 440.32 / 440.33 / 440.34
Complete the classification and nameplate data to see this result.
Disconnecting Means Sizing
NEC 440.12
Complete the classification and nameplate data to see this result.
Overload Protection
NEC 440.52 / 440.53
Complete the classification and nameplate data to see this result.
Disclaimer
The calculators and tools provided on this website ("EEE Corp Calculators") are intended for informational and preliminary design assistance purposes only. Results are based on the National Electrical Code (NEC/NFPA 70) and general industry practices as interpreted at the time of development, and may not reflect the most current code edition, local amendments, or Authority Having Jurisdiction (AHJ) requirements applicable to your project.
These calculators do not account for every possible electrical scenario, edge case, or site condition. Factors such as unusual load profiles, non-standard installation methods, environmental conditions, existing infrastructure limitations, and project-specific constraints may affect the correct design and are not necessarily captured by these tools.
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