Maximum Demand Table C1 __link__ Jun 2026

Without Table C1, every building would require a supply capable of running every appliance simultaneously at full power—an economically ruinous requirement.

The table consists of several columns, each representing a different load type, such as:

The total maximum demand would be: 8 kW + 3 kW + 1.5 kW = 12.5 kW maximum demand table c1

Small bracketed numbers in the table refer to essential notes in Appendix C that clarify specific scenarios, such as how to treat exhaust fans or outdoor lighting. Why Use Table C1?

This reduction translates into:

In multi-unit developments, communal loads (e.g., car park lighting, lifts) are calculated separately and added to the unit totals using specific factors found in later sections of the table or by referring to Table C2 for non-domestic equipment like lift motors.

Maximum Demand Table C1 is a table provided by the Institution of Engineering and Technology (IET) in the UK, specifically in the IET Wiring Regulations (BS 7671). The table is used to calculate the maximum demand of an electrical installation, taking into account the various loads and their diversity. Without Table C1, every building would require a

Applicable to Single Domestic Installations or individual living units per phase.