Stage 1 included the installation of eight no. 150 diameter A15:B15 carrying 11kv feeder cable through the Perth city centre to supply the new BHP building. The cables were laid within eight conduits beneath the road pavement in a trench approximately 1.3m width and 1.2m deep.

This project required close liaison with Western Power, City of Perth, the developer and of course local tenants and residents to ensure minimum disruption to traffic, particularly at peak periods. An added complication was that the project was undertaken in the lead up to Christmas, so as well as traffic management, pedestrian management and pedestrian safety became a priority.

As a result of our successful installation of stage one, our team was awarded Stage 2 of the feeder cable installation to the new BHP building.

Stage 2  also consists of a bank of 8 conduits and two 11,000V feeder cables. The conduits are installed by open trenching in the road, which requires stringent quality control of the backfill compaction prior to asphalt.

One section of the works crosses the Public Transport Authority rail tunnel and as such strict conditions regarding vibration are imposed. To comply with these requirements our team used backfill technologies that require no vibratory compaction.

Both projects were completed on time and on budget with zero harm and to the great satisfaction of all stakeholders.