Calculations should be based on the total circuit current, the circuit's maximum demand, or the protective device rating.
If a load is distributed along a circuit (e.g., multiple street lights), you may use 50% of the total load for the calculation as per Clause 3.6. AS3000 - Simplified Voltage Drop as3000 voltage drop
If your calculation says you need 6mm² but you have a roll of 10mm² in the van, use the 10mm². There is no penalty for oversizing cables except the cost of copper. Oversizing also reduces heat and future-proofs for load increases. Calculations should be based on the total circuit
This method uses "Ampere-metres per 1% voltage drop" (Am/%Vd) values. You can quickly check compliance using this formula: There is no penalty for oversizing cables except
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:
A 32A three-phase load on a 30m run of 6mm² cable. If Table C7 gives a value of 615 for this cable, the drop is B. The Detailed Method (AS/NZS 3008) Accurate Voltage Drop Calculator AS/NZS 3008
