As3000 Maximum - Demand Best

In practice, determining MD is not a one-step calculation; it is an iterative design loop:

For electrical contractors and engineers in Australia and New Zealand, calculating is one of the most critical steps in any installation. Governed by AS/NZS 3000 (often called "The Wiring Rules"), these calculations ensure that an electrical system can handle the expected load without overheating cables or tripping main circuit breakers. as3000 maximum demand

Your Maximum Demand is 68 Amps . Therefore, you would install a 63A or 80A Main Switch (depending on the next standard size up and the rated current of the consumer mains cable). In practice, determining MD is not a one-step

This is where it gets interesting.