A 1.5 mm² copper circuit on a 10 A curve C breaker can run 34.85 m at its full load. Voltage drop sets that length: at 34.85 m the drop reaches the 5 % limit of AS/NZS 3000:2018 Cl 3.6.2.
The case
The circuit is single‑phase at 230 V with a 1.5 mm² earth and a design current of 10 A at a power factor of 1. AS/NZS 3000:2018 Table B1 gives a fault loop length of 82 m for this cable and device, so the loop is not the limit here.
What changes the answer
The real load is often lower than the breaker. A lighting circuit that draws less current can run further before the drop reaches the limit.
A larger cable runs further. 2.5 mm² on the same breaker reaches the limit at 63.82 m.
See also: What size cable for a lighting circuit in NZ? and Maximum length of a 20 A final subcircuit.