Surfix vs Flat Twin and Earth – Which Cable is Right for South African Homes?

Why the Cable Choice Matters

When wiring a home or small business in South Africa, two of the most common fixed wiring cables are Surfix (sometimes called Norsk) and Flat Twin and Earth. Both are flat, multi-core cables that appear similar at first glance, but they are designed for slightly different applications. Choosing the correct one ensures safety, performance, and compliance with the national wiring code, SANS 10142.

What is Surfix Cable?

Surfix is a rigid, flat cable used mainly for fixed electrical installations.

Solid copper cores (non-stranded)
PVC insulation around each conductor
Flat PVC outer sheath
Includes live, neutral, and a bare copper earth conductor
Typically run inside walls, ceilings, or conduit

What is Flat Twin and Earth Cable?

Flat Twin and Earth is another fixed installation cable, but with a slightly different design.

Flat, solid copper conductors
PVC insulation on live and neutral wires
Sleeved or insulated earth conductor (instead of bare)
Widely used in residential plug and lighting circuits
Long-established in traditional South African wiring

Key Differences Between Surfix and Flat Twin and Earth

Earth conductor: Surfix uses bare copper; Flat Twin and Earth has a sleeved earth
Typical use: Surfix is often chosen for geysers, stoves, and DB board connections; Flat Twin and Earth is common for plugs and lighting
Outdoor use: Neither should be left exposed. Both must be installed inside UV-rated conduit when used outdoors
Availability: Surfix is more widely available in modern retail, but both are still stocked

Which One Should You Use?

Both cables are SANS-compliant when installed correctly. The choice usually depends on:

The application (Surfix for high-load appliances, Flat Twin and Earth for general circuits)
Electrician preference and experience
Stock availability at suppliers

For most homeowners, the decision is best left to a registered electrician.

Common Mistakes to Avoid

Using Surfix or Flat Twin and Earth exposed to direct sunlight
Running undersized cables for high loads
DIY installations without a Certificate of Compliance
Confusing flexible cables like cabtyre with fixed wiring cables

FAQs

Can Surfix cable be used outdoors?
Yes, but only if installed inside UV-rated conduit.

Is Flat Twin and Earth still allowed in South Africa?
Yes. Both Surfix and Flat Twin and Earth are legal under SANS 10142.

Which is safer?
Both are safe if installed correctly. Safety depends on installation, not just cable type.

Which is cheaper?
Prices vary by copper market conditions, but both are considered affordable fixed wiring options.

Choosing the Right Cable with Lite-Glo

At Lite-Glo, we stock Surfix and Flat Twin and Earth cables in a wide range of sizes and lengths. Whether you are wiring a new home, upgrading circuits, or supplying appliances, you can order online for fast delivery or in-store pickup.

[Carousel Placeholder: Surfix Cable | Flat Twin and Earth Cable]

Shop Surfix Cable – Per Meter