Overhead Powerline Work SWMS

Overhead powerline work is construction, maintenance and repair on or near energised overhead electrical conductors. It is high risk construction work under the WHS Regulation because it involves a risk of a person falling more than 2 m and work on or near energised electrical installations or services (s291), so a SWMS is mandatory (s299). Energised electrical work is prohibited unless de-energising is not reasonably practicable or the work meets the limited live-work exceptions, so the SWMS opens by testing that prohibition. The two defining hazards run together: electrocution from contact with, or approach within the minimum safe distance of, an energised conductor — which can kill without contact via arc or flashover — and falls from height, because the work is done from poles, towers and elevating work platforms above 2 m. A conductor that is assumed dead but is still live, an approach that breaches the minimum clearance, or a conductive tool or load that bridges to the line are the failure modes that cause fatalities. The controls turn on isolation and proving dead wherever practicable, network-operator authorisation and access permits, minimum approach distances with an observer, and fall protection at height. The SWMS controls the electrical and fall envelope. It is supplied in eight jurisdiction editions, each citing its own Act, Regulation and regulator, with network and licensing duties left to the applicable state legislation and the relevant network operators.

Hazards identified

8 hazards covered, sorted by priority.

Control measures

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

1. 1Elimination — De-energise, isolate, earth and prove dead so the work is carried out on a dead line wherever de-energising is reasonably practicable
2. 2Substitution — Substitute live-line stick (hot-stick) or glove-and-barrier methods, or work from the ground, for direct contact work where energised work is justified
3. 3Engineering — Network-operator isolation, access permit and applied earths, with the line proven dead before work
4. 4Engineering — Minimum approach distances maintained with insulated barriers, line covers and an EWP rated and tested for the work
5. 5Engineering — Fall-arrest harness and certified anchorage for all work on poles, towers and EWP baskets above 2 m
6. 6Administrative — Energised-work justification and permit where de-energising is not reasonably practicable, with a trained safety observer
7. 7Administrative — Network Service Provider authorisation, electrical licensing and a documented switching/access procedure
8. 8Administrative — Exclusion zone, traffic management and weather stop-criteria for work at height on lines
9. 9PPE — Insulated gloves tested to voltage, arc-rated clothing where flashover is credible, and insulated tools
10. 10PPE — Fall-arrest harness, hard hat, high-visibility clothing and safety footwear

Applicable Codes of Practice

High-Risk Construction Work triggered

Worked example

At 5:30 am, before peak load, a line crew from Vantage Powerline is set to replace a cross-arm on a distribution pole. The supervisor first tests the prohibition: the network operator confirms the feeder can be isolated for the work window, so the line is de-energised, isolated, earthed and proven dead at the worksite rather than worked live. The crew confirms the access permit and the applied earths before anyone climbs. The linesman ascends in a fall-arrest harness clipped to a certified anchor, and the EWP supporting the work is rated and set clear of adjacent live circuits, with minimum approach distances marked. A spotter watches the EWP movement and the exclusion zone keeps the public clear of the drop area. When a second, parallel circuit cannot be isolated, work near it is done to minimum approach distances with line covers and a safety observer, and no conductive tool is allowed to bridge toward it. A storm cell is tracked; when wind picks up, work at height stops until it passes. The line is restored only after the crew is clear and the earths removed.

Related legislation

• WHS Act 2011 (model)
• WHS Regulation 2025
• Managing Electrical Risks in the Workplace Code of Practice
• AS/NZS 4836:2023

Frequently asked questions