She was a third-year electrical apprentice, and her boss, Old Gerry, had given her a task that made her stomach clench: "Run the main feed. 250 metres from the switchboard to the bore. Don't undersize it, or we'll be back in summer to dig up melted rubber."

Gerry grunted, putting his reading glasses on. He studied the outputs: ambient temperature correction, soil thermal resistivity, the mandatory 5% voltage drop rule. A slow smile cracked his sun-leathered face.

"Didn't trust the American ones," Maya said.

Then she found it. A clean, no-nonsense tool with a sun-bleached Australian flag logo. The form asked the right questions: AS/NZS 3008.1.1? Check. Voltage drop max 5%? Check. Soil thermal resistivity?

Maya stared at the numbers. 400V, three-phase. 45 amps full load. But the length—250 metres—was a killer. She remembered her TAFE teacher’s voice: "Voltage drop is the ghost in the machine, Maya. Invisible until the motor just hums and won't start."

She smiled. In a country where the sun could melt your mistakes into the red dirt, the right calculator wasn't just software. It was insurance. It was her licence to get the job done once, and do it right.