Toms Gully HV Upgrade

Services

Electrical & Lighting / Project Management

Industries

Mining & Resources / Utilities & Energy Infrastructure

Client

Hanking (Principal Contractor per project SWMS)

Location

Toms Gully Mine, NT

Scope

Design and installation of four 30m lighting towers with floodlights, distribution board, and underground reticulation 

Programme

Preliminary site investigations and PWC submissions late 2022; PWC review/approval early 2023; construction and switchboard manufacture in 2023; as‑constructed drawings and handover in September 2023.

Project Overview

• Design, supply and installation of an overhead 22 kV HV line from the Power and Water (PWC) network into the mine site, 
• pole-mounted transformers (100 kVA and 500 kVA), cross-arm and switch assemblies, 
• new distribution boards (630 A and 160 A), LV reticulation and earthing, 
• surveys, negotiated connection approvals, QA/ITP documentation, testing, commissioning and handover.
  

Challenge

• Deliver an HV extension into a brownfield mine site with constrained access and variable ground conditions (rock at pole footing locations). 

• Coordinate PWC negotiated connection process, surveys and approvals while manufacturing site‑specific distribution boards (AS/NZS 61439 compliance). 

• Maintain electrical safety and quality through structured ITPs and commissioning in a remote setting.
  

Solution

• Design & approvals: Submitted Negotiated Connection Application (NCA) to PWC; progressed design through issued‑for‑review, approval and as‑constructed stages. 

• Overhead works: Procured and installed HV poles (13.5 B/C/D types), cross‑arms, EDO switch assemblies, lightning arrestors, earthing and fluorine conductor including droppers and dead‑ends. 

• Transformers & LV: Installed 
         – 100 kVA and 500 kVA 22 kV pole‑mount transformers with associated LV lightning arrestors, service arms and links; 
        – distribution boards: 630 A IP66 Form 1 board and 160 A IP56 Form 2BI board (AS/NZS 61439). 

• QA & commissioning: Applied Power Services ITP templates; completed earthing tests, LV board checks, transformer commissioning sheets and compiled handover pack. 

• Site execution: Managed rock excavation for pole footings and logistics; raised purchase orders for survey, engineering and materials to support schedule. 

Results

• Reliable 22 kV supply into the mine with compliant HV assets and documented commissioning. 

• Upgraded site distribution capacity via new boards and transformers, improving resilience and future expansion capability. 

• Complete handover package (as‑constructed drawings, test sheets and certifications) supporting operations and maintenance.