Overhead Wiring (Traction) Construction SWMS

Overhead line (OHL) traction construction and maintenance on Australia's electrified rail networks involves erecting, tensioning, and maintaining contact wire, catenary, droppers, registration arms, and section insulators on 25 kV AC mainline corridors and 1500 V DC suburban systems. The work is performed from elevating work platforms, tower wagons, hi-rail EWPs, and structures within the danger zone of energised conductors, adjacent running lines, and the rail corridor itself. A SWMS is mandatory under WHS Regulation 2025 clause 291 because the activity is high-risk construction work involving energised electrical installations, work near a road or railway corridor used by traffic, and the use of powered mobile plant. Additional duties arise under the Rail Safety National Law Act 2012 and ONRSR's safety management system framework, with network operators (TfNSW, ARTC, QR, MTM, V/Line) imposing their own access protocols, electrical permits, and possession rules that the SWMS must integrate. Without a documented, signed SWMS, work cannot lawfully commence and the PCBU is exposed to enforcement action by both the WHS regulator and ONRSR.

Hazards identified

7 hazards covered, sorted by priority.

Control measures

Hierarchy-of-controls order: elimination → substitution → isolation → engineering → administrative → PPE.

1. 1Elimination — Schedule all OHL construction within a full electrical isolation and absolute possession so no live traction supply or train movements occur in the worksite during the task.
2. 2Elimination — Pre-fabricate cantilever assemblies, droppers, and terminations off-site in a controlled workshop to remove working-at-height assembly tasks from the rail corridor entirely.
3. 3Substitution — Replace climbing of structures with EWP or tower wagon access platforms compliant with AS 1418.10 to substitute fall exposure with guarded platform work.
4. 4Engineering — Apply the network operator's traction isolation permit, install short-circuit earths at each work site boundary per AS 4292.6, and bond conductors to traction earth before any touch.
5. 5Engineering — Erect physical track protection (lookouts plus automatic warning devices or hard barricades) defining the safe place of safety per the network rule book and AS 7470 corridor controls.
6. 6Engineering — Fit EWP baskets with anchor points, tool tethers, and kickboards; bond the basket to the earthed conductor system before contact to equalise potential per AS/NZS 7000.
7. 7Administrative — Conduct a documented pre-start briefing on this SWMS, verify all workers hold current Rail Industry Worker (RIW) competencies, EWP HRWL, and network-specific electrical OHL authorisations.
8. 8Administrative — Implement a Protection Officer / Safeworking Coordinator role, issue protection notices, log all on/off-track movements, and maintain continuous radio comms with network control.
9. 9PPE — Issue arc-rated FR clothing rated minimum 8 cal/cm² per AS/NZS 4836, Class 00 insulated gloves tested within 6 months, hi-vis Day/Night to AS/NZS 4602.1, helmet with chinstrap.
10. 10PPE — Use twin-lanyard fall-arrest harness to AS/NZS 1891.1 anchored to rated points, insulated tools to IEC 60900, and safety glasses with side shields during conductor handling and tensioning.

Applicable Codes of Practice

High-Risk Construction Work triggered

Worked example

On a suburban electrification renewal project replacing a section of contact wire on a 1500 V DC corridor, the OHL crew arrives at the access point for a Saturday night absolute possession between two suburban stations. The Site Supervisor opens the pre-start briefing by walking the eight-person crew through this SWMS section by section, projected from a ruggedised tablet on the tower wagon bonnet. The team confirms the traction isolation permit number, witnesses the Protection Officer placing short-circuit earths at both ends of the worksite, and the linesperson performs the test-before-touch on the catenary using an approved high-voltage detector before the first worker enters the EWP basket. Each worker signs the SWMS sign-on sheet, with RIW cards and EWP HRWL numbers logged against the controls they are accountable for. Two hours in, a freight train requires a single-line working movement on the adjacent track. The Supervisor pauses work, reconvenes the crew at the safe place of safety identified in the SWMS, annotates the document with the change in adjacent line status, and re-briefs the lookout protection arrangement before resuming. The marked-up SWMS is retained as the record of the dynamic risk control adjustment for ONRSR audit and post-possession debrief.

Related legislation

• WHS Act 2011 (model)
• WHS Regulation 2025
• AS/NZS 3000 — Electrical installations

Frequently asked questions