Using a data logger on an existing installation to see the real-world peak over a period (usually 12 months). To give you more specific guidance, let me know:
Assume two distribution boards: DB1 MD = 12 kW, DB2 MD = 10 kW Diversity factor = 1.2 Main MD = (12 + 10) / 1.2 = (similar to above) maximum demand calculation
Consult your local electrical code (e.g., Table A1 in BS 7671) for diversity guidelines. Using a data logger on an existing installation