Who Responds When It's Not Your Crew During Shutdowns?

Ever been on a shutdown site where half the crew wears a different logo on their shirt? It's a common setup, especially in WA's resources sector, and it works fine right up until something goes wrong. That's when the question nobody asked during planning suddenly gets very loud: when an emergency hits, who's actually running the show? If your shutdown workforce is mostly contractors, the lines of responsibility can blur fast. The host, the principal contractor and the subbies all have duties, but an emergency operations plan only works if it states, before mobilisation, who responds, who's trained and who's accountable. In this post, we'll unpack why contractor-heavy shutdowns open an accountability vacuum, what the Work Health and Safety Act 2020 (WA) and WorkSafe WA expect from PCBUs, and which rulebook applies if your site is a mine. We'll then look at where duties split, why interoperability trips up most plans, what your emergency response plan must nail down before anyone steps on site, and how to build the capability to back it. Let's dig in.

Why Contractor-Heavy Shutdowns Open an Accountability Vacuum

Picture a WA industrial shutdown: a compressed schedule, contractor numbers swelling, host operations staff stepping back from the day to day, and crews who know their trade inside out but not the site's emergency layout. That is the setting for a quiet gap. The host assumes the principal contractor has emergency response covered. The principal assumes each contractor brings its own arrangements. Each contractor assumes the host's site emergency team will respond when something goes wrong. Nobody has written it down, so nobody owns it. This is structural, not a personality failure, and the vacuum usually only becomes visible during an incident. The stakes are rising too. SafetyLine identifies three drivers of emergency planning change: climate-linked fire and flood risk, new industries and materials, and industrial sites sitting closer to each other. Having a site emergency operations plan is not the same as having one the contracted workforce can actually follow. Many contractors have never read it or been walked through it. On-site shutdown emergency response capability has to be more than a document. Evacuation training during shutdowns and turnarounds is where that gap often shows up first.

The WA Legal Backdrop: PCBU Duties Under the WHS Act 2020

Right, so if the vacuum is structural, the law's response to it is worth understanding.

A PCBU, or person conducting a business or undertaking, is the Act's way of saying "whoever is running the show." It's deliberately broad. It covers companies, partnerships, sole traders, and it extends well past the traditional employer-employee relationship. A PCBU owes a primary duty of care to the workers it engages or causes to be engaged, and to workers it directs or influences, so far as is reasonably practicable.

Here's the catch for a shutdown: more than one PCBU can share the same workplace. Each owes duties to its own workers. Under WA's Work Health and Safety Act 2020, the host, the principal contractor and every subcontractor are usually all PCBUs at once. So the real question isn't who's liable. It's who does what, when, and on which shift.

The Act moved away from prescriptive rules. As SafetyLine explains, PCBUs now identify hazards and choose their own controls. That means no checklist arrives from WorkSafe WA, the regulator sitting within the Department of Local Government, Industry Regulation and Safety, telling you who responds to a contractor emergency on your site.

And WHS duties can't be contracted away. A commercial clause can allocate operational roles, but it doesn't transfer the legal duty. The emergency operations plan is the document that does the real work.

Next, we'll look at which rulebook actually applies to your site.

Which Rulebook Applies to Your Shutdown Site?

Before you scope the plan, sort out which rulebook actually governs your site. Where a site is not classified as a mine under WA law, the Work Health and Safety Act 2020 (WA) and Work Health and Safety (General) Regulations 2022 (WA) are the applicable instruments, confirm your site's classification with WorkSafe WA before scoping the plan. A shutdown at a mine pulls in the Work Health and Safety (Mines) Regulations 2022 (WA) as well, and SafetyLine notes emergency management planning and response has been significantly prescribed under the Mines Regulations 2022. That is a different level of prescription, and it changes what the plan must contain.

The practical consequence is simple: the same shutdown job can carry different emergency planning, training and drill expectations depending on how the site is classified. Confirm that classification before scoping the plan, not after mobilisation. If a site straddles both regimes, treating the more prescriptive one as the floor so one plan satisfies the strictest applicable requirement is a practical approach worth discussing with your duty holders and checking against the site's actual obligations.

Terminology matters too. Emergency operations plan and emergency response plan are often used interchangeably. Use whichever language the host site, principal contractor and emergency services already use on the radio, so nobody is translating during an incident.

Where Duties Split: Host, Principal Contractor and Contractor

Once you know which rulebook applies, the next thing to pin down is who actually does what.

Host or mine operator. They hold the site knowledge: access control, permits, alarms and evacuation systems, and the gatekeeping role when emergency services arrive at the gate.

Principal contractor. Coordinates the works, runs site inductions, sets emergency arrangements for the works area, and brokers the interface between contractor crews and host systems.

Contractors and subcontractors. Responsible for their own workers, supervision and competencies, and obliged to know the site emergency operations plan rather than assume induction covered it. Relying on the host's emergency response doesn't hand over the duty either: a business receiving WHS services still carries responsibility for meeting the Act, per the WorkSafe WA interpretive guideline on WHS services.

This is where it blurs in practice. Shared muster points, shared first aid resources, shared rescue equipment, simultaneous operations in the same area, and shift handovers between host and contractor crews all create moments where each side assumes the other is moving.

So write it down. A role matrix should name who responds to each emergency type, who calls 000, who meets and briefs emergency services, and who holds authority to stop work. Leave any of those blank and the split stays theoretical until someone needs it at 3am.

One caveat: check the principal contractor definition and duties in the Work Health and Safety Act 2020 (WA) directly on the WA legislation website rather than trusting a summary, because the published guidance doesn't spell it out.

Interoperability: The Part Most Emergency Operations Plans Miss

Once you've mapped the role matrix, the next question is how those roles talk to each other when things go sideways. SafetyLine identifies interoperability as central to emergency management, with PCBUs needing to work with other PCBUs, response agencies and stakeholders, a principle that flows from the shared-duty provisions of the Work Health and Safety Act 2020 (WA).

In practice, interoperability means shared radio channels and call signs, common terminology, an agreed incident command structure, and one site layout everyone understands, not three competing versions. Emergency services also need one point of contact and one site familiarisation, not competing briefings from host, principal and each major contractor.

Run joint exercises before mobilisation, not after the first incident. Contractor crews arriving mid-shutdown need to be pulled into drills rather than assumed to have absorbed the plan. Document mutual expectations in the plan too: response times, what rescue capability sits on site versus what comes from outside, and how a contractor's own emergency arrangements plug into the host's systems.

What Your Emergency Response Plan Must State Before Mobilisation

Once interoperability is sorted, the emergency response plan has to get specific. Vague lines like "contractor to manage emergencies" won't survive a 3am incident. Under the Work Health and Safety Act 2020 (WA), duties can't be contracted away, so the emergency operations plan is where the real allocation gets written down.

Who responds, who is trained

Name roles, not companies: who enters a confined space to rescue, who attends a medical emergency, and who is incident controller on night shift. Then list the competencies each role needs. Confined space, working at heights, gas testing, breathing apparatus, tower and rope rescue, low voltage rescue and CPR, plus fire extinguisher and warden training are useful capability illustrations, not a legal checklist.

Who is accountable and notified

Nominate one accountable person for each emergency type on each shift, covering handovers, fatigue and days the usual person is off site. Build a call tree for host, principal contractor, contractor supervisors, emergency services and the regulator where notification is required. Names and numbers must stay current for the whole shutdown window.

Drills, records and reviews

Schedule joint drills with contractor crews, record attendance, and keep those records so you can show the plan was tested, not just written. Review it when scope changes, a new contractor mobilises, layout or shift patterns change, or fire and flood risk rises. If your crews need to build or refresh those competencies, check that any training you use is current on the National Training Register before you mobilise.

Building the Capability to Back the Plan

Once those roles, competencies and records are written down, the next question is whether the people filling them can actually do the job. Safety Heights and Rescue Training delivers nationally recognised training for workers, supervisors and administrative staff in high-risk environments. Course areas relevant to shutdown emergency response include confined space, working at heights, gas testing, low voltage rescue and CPR, breathing apparatus, tower and rope rescue, manual handling, and fire extinguisher and warden training. The company also provides shutdown emergency response services and can assist with developing and implementing emergency response plans across Western Australia.

Training supports the capability the plan depends on, the written allocation of roles still belongs to the duty holders.

The Plan Has to Answer the Question Before Anyone Arrives on Site

Training gives your crews capability, but capability without a written allocation just means someone reacts. If the answer to "who responds?" is only discovered during an incident, the plan has already failed.

Four things to lock down before mobilisation:

• Map every PCBU on site and write down who responds to each emergency type, by role and by shift. Not company names. Roles.

• Confirm the applicable regime (general WHS or Mines Regulations 2022) and check duty-holder provisions in the Act itself.

• Back the plan with verified training, joint drills that include contractor crews, and records showing you tested it. A drill without contractor attendance tests half the response.

• Review the plan whenever scope, contractors or conditions change. Treat interoperability with other PCBUs and emergency services as a design requirement, not an afterthought. Keeping a standard emergency action plan template on hand is a decent way to keep that review honest.

Conclusion

Accountability during a shutdown doesn't disappear just because your own crew has clocked off. The WHS Act 2020 (WA) is clear: the duty to respond belongs to the PCBUs in control of the site, and that duty must be written down, not assumed. A plan that names companies instead of roles, or relies on training without a documented allocation of responsibility, will leave someone guessing when it matters most.

Verify your training is current against the National Training Register before you mobilise.

Do the paperwork now, so the response happens on the day.

Frequently Asked Questions

Why do contractor-heavy shutdowns create an accountability gap during emergencies?

Each party can assume someone else has emergency response covered. The host assumes the principal contractor has it, the principal assumes each contractor brings its own arrangements, and contractors assume the host's site emergency team will respond. Because nobody has written it down, nobody owns it, and the gap usually only becomes visible during an incident.

What duties do PCBUs have under the Work Health and Safety Act 2020 (WA)?

A PCBU (person conducting a business or undertaking) owes a primary duty of care to the workers it engages or causes to be engaged, and to workers it directs or influences, so far as is reasonably practicable. More than one PCBU can share a workplace, so the host, principal contractor and subcontractors are usually all PCBUs at once. WHS duties cannot be contracted away, though a commercial clause can allocate operational roles.

Which rulebook applies to a shutdown site?

If the site is not classified as a mine, the Work Health and Safety Act 2020 (WA) and Work Health and Safety (General) Regulations 2022 (WA) apply. A shutdown at a mine also pulls in the Work Health and Safety (Mines) Regulations 2022 (WA), which prescribe emergency management planning and response in more detail. Confirm the site's classification with WorkSafe WA before scoping the plan.

What must an emergency response plan state before mobilisation?

It should name roles rather than companies: who responds to each emergency and what competencies they need, and who is the accountable person for each emergency type on each shift. It should also include a call tree covering the host, principal contractor, contractor supervisors, emergency services and the regulator where notification is required. Joint drills with contractor crews should be scheduled and recorded, and the plan reviewed when scope, contractors, layout, shift patterns or risks change.

What does interoperability mean in a shutdown emergency plan, and how is it achieved?

Interoperability means PCBUs, the host, principal contractor, contractors and emergency services can work together during an incident. In practice it involves shared radio channels and call signs, common terminology, an agreed incident command structure, and one site layout everyone understands. Emergency services should have one point of contact. Joint exercises should be run before mobilisation, and mutual expectations such as response times and rescue capability should be documented.