What Size Armoured Cable For Outdoor Lighting

When it comes to outdoor lighting, it's important to choose the right size armoured cable to ensure safety and optimal performance. Armoured cables provide additional protection against damage or interference from external factors, such as weather conditions, rodents, or accidental impact. Here's a detailed guide to help you determine the appropriate cable size for your outdoor lighting needs:

Factors to Consider:

Wattage of the lighting fixtures:

The wattage of the lights will determine the current draw and the appropriate cable size. Higher wattage fixtures require larger cables to handle the increased current. -

Length of the cable run:

Longer cable runs experience voltage drop, which can affect the brightness of the lights. Choose a larger cable size for longer runs to minimize voltage loss. -

Burial depth:

Cables buried underground must be protected against damage from digging or other activities. Larger cables are more resistant to crushing and penetration. -

Environmental conditions:

Consider the weather conditions and potential exposure to moisture, sunlight, or extreme temperatures. Choose a cable with an appropriate insulation rating and UV resistance.

Cable Size Recommendations:

Low-wattage fixtures (up to 150W):

14 AWG or 16 AWG armoured cable -

Medium-wattage fixtures (150W-500W):

12 AWG armoured cable -

High-wattage fixtures (over 500W):

10 AWG armoured cable -

Long cable runs (over 100 feet):

Consider using a larger cable size, such as 10 AWG or 8 AWG, to minimize voltage drop.

Other Considerations:

Conductor material:

Copper conductors offer better conductivity and durability compared to aluminum. -

Voltage rating:

Ensure the cable's voltage rating is compatible with the voltage of the lighting fixtures and power source. -

Armour type:

Interlocked armour provides the highest level of protection, while corrugated armour is more flexible. Choose the appropriate armour type based on the installation requirements.

Conclusion:

Selecting the correct size armoured cable for outdoor lighting is crucial for safe and efficient operation. By considering the wattage of the fixtures, length of the cable run, burial depth, and environmental conditions, you can ensure that your outdoor lighting system performs optimally and provides years of reliable illumination.