Building Wire

Building Wire: Single-Core 1.5mm and 2.5mm Rolls for Switchboard and Circuit Wiring

Every switchboard build and circuit rewire starts with the right conductor in the right colour, and running short halfway through a job costs more than carrying a spare drum. Our building wire comes in 100m rolls, in the sizes most commonly used for lighting and power circuits, with colour options for active, neutral and switch wiring. Don't forget the earth conductor, such as this 2.5mm green/yellow earth building wire, so you can order the whole circuit in one go.

What's in This Range

• 1.5mm Black Building Wire — a 1.5mm black building wire on a 100m drum, suited to lighting circuits and light-duty switch wiring.
• 2.5mm Red Building Wire — a 2.5mm red building wire roll for power circuit and general-purpose switchboard wiring.
• 1.5mm Earth Building Wire — the 1.5mm green/yellow earth wire for earthing lighting circuits and bonding.
• 1.5mm Blue with White Stripe — 1.5mm blue building wire with white stripe, a striped option for switch drops and multi-way lighting where plain colours aren't enough.

Who Uses This

Switchboard upgrades and new board builds are the obvious fit, but this wire also goes into retail refurbishments, warehouse lighting changes, school maintenance work and residential rewires. Panel builders use the striped and coloured options to keep internal wiring easy to trace, while electricians on service calls keep a few drums in the van for patching and repairs.

Building Wire — Common Questions

Should I choose 1.5mm or 2.5mm building wire?

It depends on the circuit and the load it carries. 1.5mm wire is the usual choice for lighting circuits and switch wiring, while 2.5mm is common on power circuits. Check the circuit design and the Wiring Rules first, and if a run needs both sizes, a 2.5mm option like this 2.5mm grey building wire sits alongside the 1.5mm black and blue rolls on the same job.

Why are there different colours of building wire?

Colours let you identify each conductor's role in the circuit without testing every core. Earth is green/yellow, and the other colours and stripes help separate active, neutral and switch conductors inside a board or conduit run. Picking a clear colour scheme before you start saves time at inspection and fault-finding stage.

How much building wire comes on a roll?

Rolls in this range are sold as 100m drums, whether it's 1.5mm or 2.5mm wire. For larger jobs, work out your total run length per colour and size before ordering, and add a margin for terminations and cut-offs so you aren't left a few metres short on the last circuit.

Why Choose SCHNAP

• Eltech building wire in 1.5mm and 2.5mm sizes, with product pages listing compliance with the AS/NZS 3000 Wiring Rules.
• Consistent 100m drums across the range, so you can price and plan a job by the roll.
• Trade discounts, a 30-day return policy and Australia-wide delivery on building wire orders.

Need to match a full circuit? Browse the rolls above and add what your next job needs.