Gateway Metalworks fabricated and installed a heavy-gauge steel protection cage around a live City of Cape Town mini substation. The structure shields the transformer from theft, tampering and accidental contact, while keeping full access for authorised technicians.

Mini substations sit exposed on pavements and verges across South Africa. They draw constant attention from copper thieves and vandals. Each breach cuts power to entire neighbourhoods and costs municipalities millions in repairs.

This project delivered a custom security mesh infill sized to the existing concrete plinth. The enclosure uses a galvanised steel frame with security infill panels. A lockable service door provides City crews with safe access for maintenance.

Some sites require security mesh infill, and for others, we installed palisade fencing, depending on the needs and requirements of the City of Cape Town.

THE CHALLENGE

• Protect a live transformer without disrupting power supply during installation.
• Match the footprint of an existing concrete base with zero tolerance for misalignment.
• Resist angle grinder attacks, bolt cutters and prying tools.
• Allow airflow to prevent transformer overheating.
• Provide technicians with quick access for scheduled maintenance.

THE APPROACH

Gateway Metalworks designed a modular cage with these specifications.

• Mesh: Heavy-gauge security mesh infill, anti-cut profile
• Door: Reinforced single leaf with anti-drill lock housing
• Base fixing: Chemical anchor bolts into the existing concrete plinth
• Ventilation: Full mesh walls allow continuous airflow
• Finish: Galvanised coating for 25-plus years of corrosion resistance