Do I need to use Armoured cable for outside lights?

Yes, armoured cable is often recommended, and sometimes required, for outdoor lighting installations, especially when running electrical cables underground or in areas where the cable may be exposed to physical damage. Here's why:

1. Protection Against Physical Damage:

Armoured cables have a layer of steel or aluminum wire around the inner wires, offering extra protection against impacts, abrasions, and other physical hazards. If your outdoor lights are being installed in areas like gardens, paths, or areas with high foot traffic, armoured cables provide essential protection.

2. Weather Resistance:

Armoured cables are designed to withstand harsh weather conditions. They are durable and resistant to moisture, UV rays, and temperature fluctuations, which makes them ideal for outdoor environments.

3. Electrical Safety:

Armoured cables help ensure electrical safety in outdoor installations. In the event of an accidental cut or damage to the outer sheath, the armoured layer provides additional shielding to prevent electrical hazards like short circuits or electric shocks.

4. Regulations:

In the UK, regulations (such as those from the IET Wiring Regulations 18th Edition) may require armoured cables for certain outdoor electrical work. If you’re planning to install outdoor lights that are wired underground or in exposed locations, using armoured cable may be a requirement to comply with safety standards.

5. Alternative Options (When Armoured Cable is Not Required):

• Cable Conduit: In some cases, if you’re not running the cable underground, you may use non-armoured cables but install them inside a protective conduit. The conduit would protect the cable from physical damage and weather elements.
• Weatherproof Cables: For surface-mounted outdoor lights, weather-resistant cables (such as PVC cables with weatherproof sheaths) may be sufficient if they are not exposed to significant physical damage.

When to Use Armoured Cable:

• When running cables underground to connect outdoor lights.
• If cables are likely to be exposed to heavy wear (e.g., under decking, in areas with foot traffic, or near plant growth).
• For high-power lighting systems, such as floodlights, which require additional safety measures.

Conclusion:

While not every outdoor light installation will need armoured cable, it’s highly recommended for safety and durability, especially in areas where the cable will be exposed to potential damage. If you’re uncertain, it's always a good idea to consult a qualified electrician to ensure your installation complies with local regulations and is safe.