Wiring materials must comply with the relevant New Zealand standards.

Cable	Insulation colour
Two-core plus earth TPS (tough plastic sheathed) Two-core cable (no earth)	Phase – red Neutral – light blue or black Earth – green or green/yellow (Note that older TPS cable may have no insulation to the earth wire.)
Lighting wiring	Phase – brown Neutral – black Earth – green/yellow (where provided)

Two-core plus earth cable must be used for power outlets. It is also recommended for lighting circuits so that, if a metal light fitting is installed, it has earth protection.

TPS two-core cable (mm2)	Earth	Current (A)	Wattage (kW)	Used for:
6.0	Yes	40	9.75	• Dedicated circuit to freestanding stove.
4.0	Yes	32	7.75	• Dedicated circuits to hob, wall oven, heat pump, embedded floor and undertile heating, remote electric continuous-flow water heater.
2.5	Yes	24	5.75	• Power outlets with maximum 3 double outlets per circuit – kitchens, laundries. • Power outlets with up to 12 double outlets per circuit and maximum load of 10 amps per outlet – areas other than kitchens, laundries. • Water heater with maximum element rating of 3–4 kW. • Submains to garage or outbuilding (separate circuit for each building). • Permanently connected appliances. (Note that appliances rated above 10 amps require a dedicated circuit, but up to 10 amps may be wired as part of power outlet circuit.)
1.5	Yes	18	4.25	• Water heater with maximum element rating of 3 kW.
1.0	Yes	14	3.25	• Lights with maximum load on any one circuit of 10 amps. (Note that a minimum of 2 circuits per dwelling is required.)