Clause 3.6.2 states that voltage drop should be calculated based on , not the rating of the circuit breaker.
You don't need to memorize the reactance formulas for a house-basement reno. But you do need to know the three variables that kill you: as3000 voltage drop
There are two primary ways to determine if your circuit complies with the standard: the found in AS3000 and the Detailed Method found in AS/NZS 3008. A. The Simplified Method (AS3000 Table C7) Clause 3
Pro tip: If you are running a sub-main to a distribution board, remember that this 5% includes everything —the main switchboard feed plus the final sub-circuit. Don’t use the whole 5% on the long cable run to the shed, or your GPOs inside the shed will be running on fumes. as3000 voltage drop