Maximum Demand Table C1

Maximum demand is defined as the greatest average load (typically measured in amperes or kilovolt-amperes) likely to be drawn by an electrical installation under normal operating conditions over a specified interval. It is not a simple sum of every circuit breaker’s rating; if one added every light, power point, and appliance rating in a house, the total would be far higher than any actual real-world draw. This is where Table C1 comes into play.

Here is a breakdown of what Table C1 is and how it is used in conjunction with Maximum Demand calculations. maximum demand table c1

To use Table C1, an engineer first lists every circuit's connected load. Next, they apply the appropriate multiplier or rule from the table. Finally, they sum the results. For example, a house with 10kW of lighting, 15kW of socket outlets, and a 5kW cooker might have a total connected load of 30kW, but after applying Table C1, the maximum demand could be as low as 12–15kW. This final figure directly determines the size of the main switch, the incoming supply cable, and the service fuse. Maximum demand is defined as the greatest average

The is a critical reference in the AS/NZS 3000:2018 Wiring Rules used to determine the peak electrical load for single and multiple domestic installations. It provides a standardized "calculation method" to estimate the maximum demand by applying diversity factors—the logical assumption that not all appliances and lights will be switched on at full capacity simultaneously. Structure of Table C1 Here is a breakdown of what Table C1