Difference Between Class 2 and Class 5 Wires

When it comes to home wiring, most people only focus on switches and appliances. But behind all those is one of the most important components — the wire, and not all wires are the same.

If you’re building a new house or facing an issue with high electricity bills, it’s time to understand the difference between Class 2 and Class 5 wires.

What Are Class 2 and Class 5 Wires?

A 1.5 sq. mm Class 2 and Class 5 wire will both be 1.5 sq. mm in overall cross-sectional area. The classification is based on the copper structure – strands and strand size.

• Class 2 Wire: Fewer strands of larger size.
• Class 5 Wire: More strands of smaller size.

Class 2 vs Class 5

Where Are Class 2 and Class 5 Wires Used?

• Class 2 wires are typically used inside walls and ceilings where the wires are permanent and used regularly.

• Class 5 wires are used in flexible applications like power cords, appliances, extension boards where flexibility is useful and they are not used regularly.

Conclusion

Both wires have their purpose. Knowing the difference helps you make smarter decisions.
Pro Tip: Class 2 Wires are slightly more expensive at first but they have better performance and safety. If the wire is used permanently, you recover the extra cost in 7–8 months!

Which Wire Is Best for Home Wiring?