Fatigue Management NZ: Your Compliance Guide Under HSWA 2015

Fatigue is one of the most under‑recognised hazards in New Zealand workplaces. Under the Health and Safety at Work Act 2015 (HSWA), every PCBU (Person Conducting a Business or Undertaking) has a primary duty to manage fatigue as a risk to health and safety. This guide explains what that means for shift workers, managers, and drivers — with exact legal references and practical steps.

What the Law Says: HSWA 2015 Primary Duty

Section 36 of HSWA 2015 states that a PCBU must ensure, so far as is reasonably practicable, the health and safety of workers and others affected by the work. Fatigue is explicitly recognised as a health and safety risk — it impairs judgment, slows reaction times, and increases the likelihood of incidents.

What 'Reasonably Practicable' Means for Shift Work

Section 22 HSWA defines 'reasonably practicable' as what is, at the time, reasonably able to be done in relation to the risk, weighing up:

• The likelihood of the hazard or risk occurring
• The degree of harm that might result
• What the person knows or ought to know about the risk and ways to control it
• The availability and suitability of controls
• The cost associated with controls (grossly disproportionate to the risk)

For shift work, this means you must consider shift length, rotation patterns, recovery time between shifts, and the nature of the work. A common benchmark is the NZS 8134:2021 standard (Health and Disability Services) which at clause 2.7 recommends limiting consecutive night shifts to no more than three, and ensuring at least 10 hours between shifts. While this standard is specific to health care, it reflects good practice across industries.

Transport Agency Fatigue Rules for Drivers

If your workers drive as part of their job (including light vehicles), you must comply with Land Transport Rule: Work Time and Logbooks 2007 (Rule 62001). Key requirements:

• Maximum work time: 13 hours in any 24‑hour period (s4.2)
• Minimum rest: 10 continuous hours off in every 24‑hour period (s4.3)
• Break after 5.5 hours: A 30‑minute continuous rest break (s4.5)
• Logbooks: Required for vehicles over 3.5 tonnes or carrying dangerous goods (s6.1)

These rules apply to all driving time, not just when the vehicle is moving. Loading, unloading, and waiting count as work time.

Rest Break Requirements Under the Employment Relations Act 2000

Section 69ZD of the Employment Relations Act 2000 (ERA) requires employers to provide:

• 10‑minute paid rest break for every 2–4 hours worked
• 30‑minute unpaid meal break for every 4–6 hours worked
• Breaks must be continuous and taken at reasonable times

For shift workers, these breaks must be scheduled so they are actually taken. A common mistake is to schedule a break at the end of a shift — that doesn't count. The ERA also allows for compensatory breaks if the nature of the work prevents a break (s69ZD(3)), but this must be agreed in writing and the break taken as soon as practicable.

Practical Fatigue Management Steps

Here’s how to meet your duties:

1. Assess the risk: Use a fatigue risk assessment tool (e.g., the Fatigue Risk Management System from WorkSafe NZ). Consider shift timing, workload, commute time, and individual factors (e.g., sleep disorders).
2. Design rosters wisely: Avoid forward‑rotating shifts (morning → afternoon → night). Limit consecutive night shifts to 2–3. Ensure at least 10–12 hours between shifts.
3. Provide education: Train workers and managers to recognise fatigue signs (yawning, microsleeps, irritability) and to report concerns without fear.
4. Monitor and review: Use fatigue‑detection technology (e.g., in‑vehicle cameras) or simple check‑ins. Review incident data for fatigue‑related patterns.
5. Document everything: Keep records of risk assessments, rosters, break schedules, and training. This is your evidence of 'reasonably practicable' steps.

If you’re unsure how your current policies stack up, your team can ask ShiftScript questions directly from uploaded policy documents at shiftscript.nz/portal/. It’s a fast way to check compliance without reading every clause.

Industry‑Specific Standards

Some sectors have additional rules:

• Health care: NZS 8134:2021 standard 2.7 (as above) and the DHB Fatigue Management Policy
• Aviation: Civil Aviation Rule Part 121 (flight crew) and Part 135 (air transport)
• Maritime: Maritime Transport Act 1994, Part 4B (fatigue management plans)
• Mining: Health and Safety at Work (Mining Operations and Quarrying Operations) Regulations 2016, reg 37 (fatigue management plan required)

Check with your industry association or WorkSafe NZ for specific guidance.

Frequently Asked Questions

Can a worker refuse to work a shift because of fatigue?

Yes, under s83 HSWA, a worker may refuse to carry out work if they believe it would expose them to a serious risk to health or safety. Fatigue can be such a risk. The PCBU must investigate and address the concern.

Do the Transport Agency rules apply to light vehicles?

Yes, the work time and rest break rules apply to all drivers of vehicles over 3.5 tonnes gross vehicle mass, or any vehicle carrying dangerous goods. For light vehicles (e.g., courier vans), the ERA rest break rules apply, but the 13‑hour limit does not — though it’s still best practice.

What is the maximum number of consecutive night shifts?

There is no specific legal limit under HSWA, but NZS 8134:2021 recommends no more than three consecutive night shifts. Many collective agreements also cap it at three. Beyond that, cumulative fatigue becomes a significant risk.

Can I use a fatigue‑detection app instead of a logbook?

For drivers subject to the Land Transport Rule, a logbook is mandatory (s6.1). However, you can use an electronic logbook system approved by NZ Transport Agency. Fatigue‑detection apps are supplementary, not a replacement.

What should I do if a worker falls asleep on the job?

First, ensure the worker is safe and not operating machinery. Then, investigate the root cause — is it a one‑off (e.g., illness) or a systemic issue (e.g., poor roster design)? Update your fatigue risk assessment and consider medical referral. Do not discipline without understanding the cause.

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