The Challenge
Dawn Fraser Baths is one of Sydney’s most iconic harbour swimming locations. But when swimmers began reporting small electrical tingles from the metal tap system, the situation required immediate investigation.
In coastal environments, even very minor stray voltage can be amplified. Saltwater increases conductivity. Barefoot patrons, wet surfaces, exposed metal fixtures, and ageing infrastructure create a unique electrical risk profile that must be managed carefully.
Under the direction of Con Loukaitis, Facilities Management Manager from Inner West Council, Micron engineers were engaged to conduct a full power and grounding analysis across the facility.
This was not a simple fault-finding exercise. It required a systems-level engineering review.
Engineering Investigation
Micron carried out comprehensive testing across the site including earth impedance measurements, bonding verification, switchboard earthing integrity, and generator bonding assessments.
While no major electrical fault was detected, testing revealed that the existing grounding network was not sufficiently robust for a marine environment. The earthing paths did not provide the low-impedance performance required to eliminate potential differences across metallic infrastructure in a high-moisture coastal setting.
In facilities exposed to salt air, sand, timber, sandstone and concrete, grounding systems must be engineered beyond standard commercial assumptions.
The solution required a significant enhancement of the site’s earthing architecture.
The Engineered Solution
The works comprised installation of a heavy-duty 25mm² earthing cable integrated directly into the main electrical switchboard. The cable was routed via compliant support structures and conduits to the designated sand area.
Within this zone, a 316 stainless steel earth bar was securely buried beneath the sand. It was installed up the concrete, sandstone and timber posts and bonded directly to the building’s electrical system to create a low-impedance earth path. The use of 316 stainless steel was critical to ensure corrosion resistance in the marine environment.
In addition, a supplementary 25mm² earthing link was extended into the garden area, where an approved earth stake was installed and bonded to the main earthing system. This provided improved equipotential bonding across landscaped zones.
A third earth stake was installed adjacent to the generator enclosure on the street side. This ensured that all auxiliary equipment and footpath installations were properly bonded into the same grounding network, eliminating differential voltage potential between separate site areas.
Safety and Compliance
Before any excavation works commenced, comprehensive underground service scans were undertaken to identify and mark all existing utilities and infrastructure. This ensured protection of services and safety of personnel.
All excavation and installation works followed strict safe work procedures, including isolation protocols, PPE requirements, and continuous monitoring of site conditions.
The approach was engineered to deliver a long-term, compliant grounding solution rather than a temporary fix.
The Result
Following completion of all grounding works, testing confirmed compliant earth impedance levels and strong bonding integrity across the facility.
Most importantly, swimmers no longer experienced electrical tingling.
The site now benefits from a robust, multi-point earthing system specifically designed for a coastal aquatic environment.
Why This Project Matters
Public aquatic facilities present unique electrical challenges. Saltwater, exposed metal infrastructure, heritage construction materials, and barefoot patrons all increase risk if grounding systems are not designed correctly.
This project demonstrates the importance of proper engineering analysis, stakeholder collaboration, and designing earthing systems to suit real-world environmental conditions.
Grounding systems are invisible when working correctly. But when they are inadequate, the public feels it immediately.
At Dawn Fraser Baths, Micron engineers delivered a compliant, resilient, and long-term grounding solution — restoring safety and confidence across the entire facility.