Transformer & Switchgear Installation SWMS
Transformer and switchgear installation — oil transformer set, dry-type transformer, MV/LV switchgear, cable terminations, oil spill containment, and commissioning testing.
SWMS variants reference your state’s WHS legislation. Instant download after payment.
Transformer and switchgear installation covers the placement, termination, oil filling or dry-type assembly, and commissioning of MV/LV distribution plant up to 11 kV, including DNSP-interface switchgear and protection devices. The work routinely involves crane lifts of 2–15 tonne plant, energised primary connections, dielectric oil handling, and proximity to live network assets under DNSP access permits. Under WHS Regulation 2025 Part 6.3, this is high-risk construction work because of energised electrical exposure and confined oil-bund entry, mandating a documented SWMS before any worker steps on site. The Electricity Safety Acts in each jurisdiction layer additional duties around isolation, earthing, and competent person sign-off that must be reflected in the procedure. Legacy unit replacements carry a residual PCB contamination risk requiring hazardous chemical controls under Chapter 7. A compliant SWMS aligns the PCBU, principal contractor, DNSP, and licensed electrical workers around a single sequence of controls before, during, and after energisation.
Hazards identified
7 hazards covered, sorted by priority.
Third-degree burns, blast lung injury, retinal damage, fatality and prosecution for failure to isolate under Electricity Safety Act
Crush fatality, plinth structural damage, oil release and notifiable incident under WHS Regulation 2025 section 35
EPA-reportable environmental contamination, slip injuries, fire load increase and Chapter 7 hazardous chemical breach
Chronic dermal and inhalation exposure, carcinogenic risk and breach of Stockholm Convention waste tracking obligations
Electric shock through stored capacitive charge, ventricular fibrillation and breach of AS/NZS 4836 earthing requirements
Asphyxiation in pit or basement substations, decomposition products causing pulmonary oedema and reportable greenhouse emission
Lumbar and shoulder injury, dropped object strike on workers below and lost-time injury claim
Control measures
Hierarchy-of-controls order: elimination → substitution → isolation → engineering → administrative → PPE.
- 1Elimination — Specify factory pre-terminated unit substations and pre-cast bunded plinths so site termination and concrete bund construction are removed from the work scope entirely.
- 2Elimination — Complete all primary terminations and meggar testing before DNSP network connection so no worker is exposed to live 11 kV primary conductors during installation.
- 3Substitution — Replace oil-filled units with dry-type cast-resin transformers where load and ambient ratings allow, eliminating dielectric oil, bund, and PCB legacy risks from the task.
- 4Substitution — Use vacuum circuit breakers in lieu of SF6 switchgear for indoor installations to remove greenhouse gas and decomposition product exposure during commissioning.
- 5Engineering — Install fixed earthing switches, interlocked racking trolleys and arc-rated switchroom barriers compliant with AS/NZS 3000 clause 2.5 before any racking or testing operation.
- 6Engineering — Deploy bunded spill trays, vacuum oil rigs with closed-loop sampling, and continuous oxygen monitors in substation rooms to control oil release and asphyxiation hazards.
- 7Administrative — Issue DNSP access permit, electrical isolation certificate and prove-dead sequence per AS 4836, witnessed by a second licensed worker before any conductor is touched.
- 8Administrative — Conduct pre-start SWMS sign-on, exclusion zone briefing per AS 2865 for confined bunds, and emergency response drill including burn first aid and oil spill response.
- 9PPE — Issue Category 4 arc-flash suits rated to calculated incident energy, Class 2 insulating gloves tested within 6 months, and AS/NZS 1337 face shields for all racking and termination tasks.
- 10PPE — Provide nitrile chemical gloves, Tyvek coveralls and P2 respirators for PCB-suspect oil handling, with decontamination station and contaminated waste drums per AS 1940.
Applicable Codes of Practice
Mandates de-energisation, testing for dead, and earthing before work on or near energised electrical parts above extra-low voltage — directly governs MV transformer commissioning.
Specifies dielectric testing, oil sampling protocols, tap-changer commissioning and clearance distances that the SWMS commissioning sequence must implement step-by-step.
Governs isolation, test-before-touch, and authorised person competencies applied to LV switchgear terminations and secondary commissioning circuits within the unit substation.
Required for handling dielectric mineral oils and PCB-contaminated legacy oils, covering SDS access, bunding, spill response and AS 1940 storage compliance during transformer work.
High-Risk Construction Work triggered
Transformer primary terminations, switchgear racking and commissioning occur on 11 kV plant connected to live DNSP feeders with induced voltage exposure throughout the task.
PCBU must prepare, consult workers on, and retain the SWMS for two years post-incident under WHS Regulation 2025 section 291; penalties are substantial and indexed, with current maximum following the prevailing WHS schedule for Category 1 and 2 offences.
Who this is for
- →Licensed electrical contractors installing DNSP unit substations
- →Principal contractors on commercial and industrial fitout projects
- →Renewable energy EPCs commissioning solar farm collector substations
- →Facilities engineers managing campus HV infrastructure upgrades
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 regional logistics warehouse project, a 1000 kVA oil-filled unit substation is being installed adjacent to an existing energised DNSP kiosk. At the 6:30 am pre-start, the electrical supervisor opens the Transformer & Switchgear Installation SWMS on a tablet and walks the four-person crew through the day's three sequenced tasks: crane placement onto the pre-cast bund, MV cable termination, and dielectric testing. The crew confirms the DNSP access permit number, isolation points, and the test-for-dead sequence against the SWMS step list. A rigger flags that the morning wind forecast exceeds the lift plan limit; referencing the SWMS crane control, the supervisor defers the lift to the afternoon window and re-sequences cable gland preparation first. Each worker signs the SWMS register, including the apprentice who is briefed on the 3-metre exclusion zone during racking. Mid-morning, a small weep is observed from a transit-damaged radiator gasket. The crew stops work, references the oil spill control in the SWMS, deploys the spill kit from the bunded tray, and the supervisor amends the SWMS as a recorded change before notifying the principal contractor. Energisation is rescheduled for the following day after gasket replacement, with the amended SWMS re-signed at the next pre-start, demonstrating the document functioning as a live risk management tool rather than a filed compliance artefact.
Related legislation
- WHS Act 2011 (model)
- WHS Regulation 2025
- AS/NZS 3000 — Electrical installations
Frequently asked questions
Is transformer and switchgear installation high risk construction work?
Yes. Primary terminations, switchgear racking and commissioning happen on 11 kV plant connected to live network feeders, with induced voltage on supposedly dead conductors throughout — work on or near energised electrical installations or services under section 291(k) of the WHS Regulation 2025, so a SWMS is required under section 299. Where an oil bund is entered and meets the confined space definition, section 291(f) applies as well. The jurisdiction's Electricity Safety Act layers further duties on top around isolation, earthing and competent person sign-off, and those must be reflected in the procedure rather than assumed.
Does this cover the crane lift onto the plinth?
Yes — the lift is one of the sequenced tasks, and lift failure during placement onto a plinth or bund is a high-priority hazard given unit masses between roughly 2 and 15 tonnes. The method requires the lift plan limits to be checked at the pre-start and then honoured: in the worked example the morning wind forecast exceeds the plan limit, so the lift is deferred to the afternoon window and cable gland preparation is re-sequenced ahead of it. A three-metre exclusion zone applies during racking, and every worker including any apprentice is briefed on it before the crew disperses.
How does the SWMS handle dielectric oil and PCB contamination in legacy units?
As hazardous chemical work with its own control set. For oil handling, bunded spill trays and vacuum oil rigs with closed-loop sampling contain the release, with spill response equipment staged and safety data sheets available before filling or sampling begins. Where a legacy unit is being replaced, residual oil is treated as PCB-suspect: nitrile chemical gloves, disposable coveralls and P2 respirators, a decontamination station, and contaminated waste drummed and stored to AS 1940 with waste tracking documentation completed. A weep from a transit-damaged radiator gasket is enough to trigger that response, as the worked example shows.
Can the oil and SF6 hazards be designed out instead?
Often, and the method puts that option first. Dry-type cast-resin transformers substituted for oil-filled units, where load and ambient ratings allow, remove the dielectric oil, the bund and the PCB legacy question in a single decision. Vacuum circuit breakers in place of SF6 switchgear for indoor installations remove the asphyxiation risk in a pit or basement substation along with the decomposition products. Further up again, specifying factory pre-terminated unit substations and pre-cast bunded plinths takes site termination and concrete bund construction out of the scope entirely.
What permits and competencies are required, and what do I receive?
Before any conductor is touched the method requires the network operator's access permit, an electrical isolation certificate and a prove-dead sequence witnessed by a second licensed worker. PPE is matched to the calculated incident energy, up to Category 4 arc-flash suits for racking and termination, with Class 2 insulating gloves tested within the previous six months. You buy an editable Word document once — hazard register, worker sign-on register, pre-start checklist, incident escalation flow and a state-specific WHS legislation schedule — and it is meant to be amended in the field, as when energisation is rescheduled and the crew re-signs at the next pre-start.
Document details
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