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Commercial load calculation sizes feeders/services for non-dwelling occupancies. It is driven by: connected loads, continuous loads (125% rule for OCPD/conductors), demand factors for lighting/receptacles where permitted, motor calculations (largest motor at 125% plus others), and HVAC/heat based on operating conditions.
continuous load 125%, demand factors, motor contribution, largest motor at 125%, non-dwelling.
Worked example (continuous load concept): If a lighting load is continuous (expected 3 hours or more), you often size the circuit at 125% of that load for conductor/OCPD sizing purposes (exam staple).
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