National Electric MFG
Methodology
Calculations are planning aids using simplified electrical, psychrometric and airflow formulae. They intentionally include safety margins and amber/red warnings. Always verify against manufacturer data, BS 7671, site conditions and competent-person inspection/testing.
These tools are deliberately written for planning conversations between electricians, site managers, facilities teams and hire/specification desks. They are not certification tools.
Where a result involves protective devices, cable ratings, RCDs, live equipment or suspected overheating, stop and involve a qualified competent person.