What Size Armoured Cable for Garage? Consider This!

The garage, often a hub of activity, requires a reliable and safe electrical supply to support various functions. From powering tools and lighting to potentially accommodating an electric vehicle charger in the future, selecting the appropriate armoured cable size is crucial.

This article aims to guide homeowners through the decision-making process, ensuring a robust and future-proof electrical setup for their garage.

Understanding Armoured Cables

Armoured cables, known for their durability and protective features, play a vital role in electrical installations. Comprising layers of insulation and armor, these cables shield against external factors, making them suitable for outdoor and underground use.

Before delving into the selection process, it’s essential to grasp the basics of armoured cables and their typical applications.

Factors to Consider

  1. Distance from House to Garage: The distance between the house and the garage significantly influences the choice of armoured cable. As a rule of thumb, longer distances may require thicker cables to mitigate voltage drop and ensure efficient power delivery.
  2. Intended Usage: Assessing the planned activities within the garage is paramount. Whether it’s basic lighting and power tools or future considerations like EV charging stations, understanding the garage’s electrical demands helps determine the appropriate cable size.

Cable Size Options

  1. Common Cable Sizes: Commonly, garages are equipped with 10mm 3 core SWA or 16mm 3 core SWA cables. The sizing denotes the cable’s cross-sectional area, and the choice depends on the expected load and distance.
  2. Electrician Recommendations: Seeking advice from qualified electricians is invaluable. Professionals consider factors such as load requirements, distance, and potential future needs to recommend the most suitable cable size.

Voltage Drop Considerations

Voltage drop, the reduction in electrical potential along the cable’s length, is a critical consideration. Minimizing voltage drop ensures consistent power supply, particularly crucial for longer cable runs.

Homeowners should be mindful of this factor to prevent performance issues in the garage’s electrical system.

Important: EV battery replacement can cost $1000s. To avoid high-voltage battery replacement, there are some things you can do. Read this article to find out the 10 best ways to maximize EV battery life and save tons of money!

Planning for Future Needs

Considering future electrical requirements is a strategic approach to ensure the longevity of your garage’s electrical setup.

While current needs may revolve around lighting and power tools, anticipating future additions such as electric vehicles, additional outlets, or smart home technologies is essential. Selecting a cable size that accommodates potential upgrades saves both time and resources in the long run.

Also read: EV Battery in Hot Temperature: 5 Things to Know

Installation Tips

Proper Burying and Ducting: Installing the armoured cable underground demands careful planning. Bury the cable at a depth of at least 600mm to protect it from external elements and potential damage. Consider using a 63mm plastic cable duct for added protection. Placing a layer of sand and incorporating yellow marker tape over the duct serves as a visual indicator, alerting anyone to the presence of buried cables.

Professional Assistance: While DIY enthusiasts may be tempted to undertake the installation process, consulting with a qualified electrician is strongly advised. Electricians bring expertise in assessing load requirements, understanding local regulations, and ensuring the installation complies with safety standards. Their input not only guarantees a secure setup but also helps prevent issues down the line.


In conclusion, the choice of armoured cable size for your garage is a decision that warrants careful consideration. Factors such as distance, intended usage, and future plans all contribute to determining the appropriate cable size.

Seeking professional guidance, whether from electricians or reputable sources, ensures that your garage’s electrical supply is not only current but also future-ready.