Substation Civil Construction SWMS
SWMS template for substation civil construction. Covers Substation slab, bunding, fence. 8-state AU coverage, CIH-reviewed editable DOCX, available as an instant download.
SWMS variants reference your state’s WHS legislation. Instant download after payment.
Substation civil construction involves the formation of reinforced concrete plinths, transformer bunds, cable trenches, earth grids and perimeter security fencing within or adjacent to energised high-voltage switchyards. This work is High Risk Construction Work under WHS Regulation 2011 r291 because it is performed in proximity to energised electrical installations exceeding the no-go zones in AS 5804, frequently involves excavation greater than 1.5 metres for cable routes and earth mats, and includes structural concrete work supporting plant in excess of 25 tonnes. A documented Safe Work Method Statement is mandatory before any work commences on site and must be developed in consultation with workers under WHS Act s47. The SWMS must address electrical induction from adjacent live conductors, mobile plant clearance from live apparatus, and the coordination interface with the network operator's access permit system. Failure to prepare, communicate and monitor a compliant SWMS exposes the PCBU to enforcement under WHS Regulation r299–r300 and personal liability for officers under WHS Act s27.
Hazards identified
7 hazards covered, sorted by priority.
Induced voltage flashover causing cardiac arrest, deep tissue burns, regulator notifiable incident and EnergySafe investigation
Phase-to-earth arc flash causing fatality, plant destruction, network outage and prosecution under WHS Act s31 reckless conduct
Worker engulfment causing crush asphyxia, traumatic asphyxiation and notifiable incident under WHS Act s35
Ventricular fibrillation from body current exceeding IEC 60479-1 thresholds, with delayed cardiac complications
EPA prosecution under state Protection of the Environment Operations Act, remediation orders and project shutdown
Acute lumbar disc injury, chronic musculoskeletal disorder and workers compensation claim under state scheme
Accelerated silicosis, lung cancer and notifiable occupational disease under WHS Regulation r675
Control measures
Hierarchy-of-controls order: elimination → substitution → isolation → engineering → administrative → PPE.
- 1Elimination — Sequence civil works to occur during a network access permit with adjacent feeders isolated, earthed and tagged before any plant enters the switchyard footprint.
- 2Elimination — Prefabricate fence panels, formwork cages and bund liners off-site to remove cutting, welding and grinding activities from the live substation environment entirely.
- 3Substitution — Replace diesel concrete boom pumps with line pumps and ground-level placement to remove elevated boom encroachment risk into HV no-go zones under AS 5804.1.
- 4Substitution — Use self-compacting concrete and screw-pile bund anchors to substitute for vibrator and percussion-driven plant near sensitive protection relays.
- 5Engineering — Install temporary insulated tiger tails, goal posts and physical barricades at AS 5804.1 clearance distances, verified by the network operator's authorised access officer before plant mobilisation.
- 6Engineering — Bond all formwork, rebar mats and crane outriggers to the station earth grid using 70 mm² copper conductors to dissipate induced voltages to ground.
- 7Engineering — Shore all excavations over 1.5 m with hydraulic struts or trench boxes designed by a competent person under AS 5100 and the Excavation Work Code of Practice.
- 8Administrative — Conduct daily pre-start briefings against this SWMS, network operator switching program and JSEA, with sign-on register retained for the project plus two years.
- 9Administrative — Restrict access using a switchyard entry permit system; only HV-inducted workers holding current EWP, dogging and confined space tickets enter the live yard.
- 10PPE — Issue Cat 2 arc-rated coveralls (minimum 8 cal/cm²), Class 00 insulated gloves, P2 respirators for silica tasks and dielectric boots compliant with AS/NZS 2210.3.
Applicable Codes of Practice
Defines mandatory no-go and vicinity zones for plant and persons working near energised HV apparatus, triggering controls for boom and crane operations.
Imposes duties for trench shoring, ground assessment and emergency rescue for earth grid and cable trench excavations exceeding 1.5 metres depth.
Governs bonding, earthing continuity and protective measures for temporary site supplies and the permanent earth grid tie-in interface.
Triggers edge protection, EWP selection and fall arrest duties during fence erection, formwork stripping and bund liner installation above 2 metres.
High-Risk Construction Work triggered
Civil construction occurs inside operating switchyards adjacent to energised HV busbars, transformers and overhead conductors within AS 5804.1 vicinity zones.
Earth grid installation, cable trenches and bund footings routinely require excavation between 1.5 and 3 metres through disturbed switchyard fill material.
Concrete trucks, boom pumps, cranes, excavators and EWPs operate concurrently within the constrained switchyard footprint during slab, bund and fence works.
The PCBU must prepare the SWMS in consultation with workers under WHS Act s47, provide it to the principal contractor before work starts, and retain it for two years from completion or until any notifiable incident is fully investigated; non-compliance penalties are substantial and indexed, with the current maximum following the prevailing WHS schedule.
Who this is for
- →Civil contractors delivering transmission substation upgrades
- →Principal contractors on distribution network capital works
- →Electrical service providers performing substation augmentation
- →Site supervisors managing renewable connection switchyards
What you receive
- ✓Editable DOCX template — Microsoft Word compatible
- ✓State-specific WHS legislation schedule (NSW/VIC/QLD/SA/WA/TAS/NT/ACT)
- ✓Hazard register with risk ratings + hierarchy-of-control mapping
- ✓Worker sign-on register, pre-start checklist, and incident escalation flow
Worked example
On a 132/33 kV zone substation augmentation in a regional industrial precinct, the civil crew is pouring a new transformer plinth and bund three metres from an energised 132 kV busbar that cannot be isolated due to network load. At the 6:30 am pre-start, the site supervisor opens this SWMS on a ruggedised tablet and works through the hazard register with the four-person crew, the concrete pump operator and the network operator's authorised access officer. The induction hazard row prompts the team to verify that the rebar cage and pump boom are bonded to the station earth grid with a 70 mm² copper conductor, which the leading hand tests with a clamp meter before the pour. The no-go zone control triggers the access officer to confirm the tiger tails and goal posts are positioned at the AS 5804.1 vicinity distance for 132 kV, and the pump operator demonstrates the boom-height limiter setting. Each worker signs the SWMS sign-on register, noting their HV induction expiry. Mid-pour, wind gusts increase and the spotter calls a stop because the boom is drifting toward the vicinity zone; the supervisor reopens the SWMS, applies the documented adverse weather trigger, and the crew switches to a ground-level line pump for the remaining two cubic metres. The amendment, the stop event and the resumed sign-on are recorded against the SWMS revision log for retention.
Related legislation
- WHS Act 2011 (model)
- WHS Regulation 2025
- AS/NZS 3000 — Electrical installations; AS/NZS 3012 — Electrical installations construction sites