: Options for cables in conduit, buried in the ground, or clipped to a surface.
If you need a quick calculation for a job, use the or Olex online calculators. If you are studying, practice using Tables 3.1, 10, and 41 in the standard to understand how the derating factors affect the final result.
A calculator based on this standard solves for three main variables to find the minimum cable size: calculator as3008
: Specifically checks that the voltage drop remains within the 5% limit mandated by AS/NZS 3000 for most installations. Practical Application: Sizing for EV Chargers
Modern non-linear loads (VSDs, LED drivers, computers) produce 3rd harmonic currents. These harmonics do not cancel in the neutral conductor. AS3008 requires specific derating or neutral conductor up-sizing when total harmonic distortion (THD) exceeds 15%. : Options for cables in conduit, buried in
The way a cable is installed dramatically affects its ability to shed heat.
A manual lookup using the AS3008 tables requires adjusting for seven critical factors. A robust AS3008 calculator ingests these variables instantly: A calculator based on this standard solves for
When multiple cables run together, they heat each other. A group of 6 single-core cables in a bundle may require a derating factor of 0.5 to 0.6—meaning you might need a cable twice as large as a single run.