What Size Armoured Cable Do I Need For Outdoor Lights?
Outdoor lighting enhances your home's aesthetic appeal and increases safety. When installing outdoor lights, choosing the right size armoured cable is crucial for optimal performance and longevity. Here's a comprehensive guide to help you determine the appropriate cable size for your outdoor lighting needs:
Voltage and Wattage
The voltage and wattage of your outdoor lights determine the current flow through the cable. Higher voltage and wattage require thicker cables to handle the increased current safely. Determine the total wattage of your connected lights and consult an electrician or refer to the cable manufacturer's specifications to determine the minimum cable size required.
Cable Insulation
Armoured cables feature an outer protective layer (armour) that protects the inner conductors from damage. The type of armour material used, such as steel, aluminium, or plastic, can vary depending on the cable's intended application. For outdoor use, armoured cables with UV-resistant insulation are recommended to withstand exposure to sunlight and extreme weather conditions.
Cable Length
The length of the cable run influences the voltage drop, which refers to the loss of voltage over distance. Longer cable runs experience higher voltage drops, requiring thicker cables to compensate for the potential voltage loss. Use a voltage drop calculator or consult an electrician to determine the appropriate cable size for your specific cable length.
Grounding
Outdoor lighting systems require proper grounding to protect against electrical shocks and ensure safety. Armoured cables typically have a bare copper conductor for grounding purposes. Ensure that the cable is securely grounded to an earth rod or other suitable grounding point.
Example Cable Sizing
For low-voltage outdoor lighting (12V-24V), such as path lights or deck lights, a 14 AWG or 16 AWG armoured cable is generally sufficient for runs up to 100 feet. For higher-voltage lighting (120V-240V), such as floodlights or security lights, a 12 AWG or 10 AWG armoured cable is recommended for runs up to 100 feet. It's always advisable to consult an electrician for specific recommendations based on your unique requirements.
Additional Considerations
In addition to the factors mentioned above, consider the following additional considerations when choosing the size of armoured cable for outdoor lights:
- Future expansion: If you plan to add additional lights in the future, choose a cable size that can accommodate the increased load.
- Local codes and regulations: Check local building codes and electrical regulations for specific requirements on cable sizing and installation.
- Professional installation: It's always recommended to have outdoor lighting installed by a qualified electrician to ensure safety, proper grounding, and compliance with electrical codes.

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