Explainer: How New Zealand made machinery work safer

New Zealand's machinery safety rules have changed substantially since the first nationwide guarding requirements of the 1950s, but the central problem has remained much the same: preventing workers from reaching dangerous moving parts and stopping machines from starting while people are exposed to them. WorkSafe's revised Safe use of machinery guidelines, published in June 2026, bring that long history into the current health and safety framework. 

Old problem

Machine guarding is not a recent requirement in New Zealand. WorkSafe says workplaces have been required to adequately guard machinery since the Machinery Act 1950 came into force. That law established specific controls around machinery at a time when industrial production depended heavily on exposed mechanical equipment. 

The machinery regime evolved as workplace health and safety regulation broadened. The Health and Safety in Employment Act 1992 moved the system towards wider employer duties rather than relying only on rules for individual hazards or machines. More detailed guidance followed. In 1995, the Department of Labour published Guidelines for Guarding Principles and General Safety for Machinery, which set out suitable types of guarding for different equipment. 

Isolation was also recognised well before the current WorkSafe guidance. A 2003 publication produced by occupational safety officials, ACC and the timber processing sector set out lockout practices for sawmills. It called for written procedures, personal locks and controls for multiple workers carrying out maintenance on the same equipment. 

Those principles remain familiar today. The terminology and legal framework have changed, but preventing access to hazardous movement and controlling stored or unexpected energy are still core machinery risks. 

System reform

The machinery guidance developed further during a wider overhaul of New Zealand workplace safety regulation.

WorkSafe was established in December 2013 after the Royal Commission on the Pike River Coal Mine Tragedy and the Independent Taskforce on Workplace Health and Safety called for major changes to the regulatory system. The Government's Working Safer programme followed, creating a dedicated regulator and setting the stage for new legislation. 

Machinery was already part of that programme. WorkSafe and the Ministry of Business, Innovation and Employment produced a position paper on safe machinery use in November 2013. WorkSafe followed with its Safe Use of Machinery best-practice guidelines in May 2014. 

Those guidelines were significant because they identified the AS 4024 machinery safety standards as a benchmark for the state of knowledge on safeguarding. Courts subsequently referred to the 2014 publication when considering whether businesses had adequately addressed machinery risks. 

The legislative framework then changed again. The Health and Safety at Work Act 2015 took effect on 4 April 2016. It replaced the Health and Safety in Employment Act 1992 and repealed the Machinery Act 1950. 

The new law put greater emphasis on identifying and managing risks before someone was harmed. Businesses became primarily responsible for the health and safety of workers and others affected by their work, while officers, workers and other people at workplaces received defined duties. 

Control hierarchy

One of the most important changes reflected in the 2026 machinery guide is its treatment of risk controls.

The updated guidance tells businesses to identify machinery hazards, assess the associated risks and then eliminate or minimise those risks so far as is reasonably practicable. It also emphasises worker involvement during that process. 

That approach reflects the hierarchy of control measures used under New Zealand's current health and safety framework. Elimination sits at the top. A business should first consider whether it can remove the risk entirely rather than protect people from a hazard that remains in place. 

Where elimination is not reasonably practicable, businesses move through progressively less effective controls. They should first consider substitution, isolation and engineering measures. Administrative controls follow if risk remains, with personal protective equipment used as the last line of defence. More than one measure may be required. 

That ordering matters for machinery. A written instruction telling a worker to keep clear of a moving component depends on human behaviour. A physical system that prevents the worker from reaching that component does not rely to the same extent on memory, concentration or compliance. 

The 2026 guide therefore describes guarding as an important way to isolate machinery hazards, but says it should be secondary to eliminating the hazard where elimination is practicable. 

Guarding gap

The persistence of serious machinery incidents helps explain why guarding occupies so much of New Zealand's safety guidance.

WorkSafe has repeatedly prosecuted businesses where workers could reach rollers, presses, conveyors, cutting equipment or other moving components. Its machinery material identifies improper use of metalworking equipment as a frequent cause of amputations, crush injuries and fractures involving fingers, hands and arms. 

A 2022 prosecution involving a steel fabrication business illustrates the issue. A worker's hand entered the pressing mechanism of a steel bending and pressing machine, causing a partial finger amputation. WorkSafe found no observable safety devices on the machine and said physical guards or safety sensors could have been installed. 

Another case involved Bag Boys at Horotiu. WorkSafe inspectors found missing and inadequate guarding, exposed chains, cogs and rollers, and machinery without effective lockout systems. Workers were clearing conveyor blockages while equipment was operating. The District Court recorded that guarding and lockout requirements were already available through regulations, machinery standards and WorkSafe guidance. 

In a separate prosecution involving Oji Fibre Solutions, a worker was seriously injured at an unguarded nip point. The court recorded that relying on a safe operating procedure or past practice was insufficient when physical protection could have prevented access to the hazard. 

These cases also show why machinery safety extends beyond normal production. Cleaning, clearing blockages, adjusting equipment and carrying out maintenance can place workers closer to moving components than routine operation does. The 2026 hazard checklist specifically asks businesses to consider what happens during blockages, cleaning, servicing and repairs. 

Lockout focus

The revised guide gives lockouts and isolation procedures their own section rather than treating them only as part of broader machinery management. 

Lockout is designed to prevent machinery or stored energy from unexpectedly putting a worker at risk during servicing or other intervention. WorkSafe's separate lockout guidance advises businesses to isolate and de-energise machinery components that could cause harm. Procedures may need to cover individual workers, multiple workers, group lockouts and safe restarting. 

Isolation has to consider more than electricity. Machinery can contain hydraulic, pneumatic, gravitational, mechanical or other stored energy. Simply pressing a stop button may therefore leave hazardous energy available or allow equipment to restart. WorkSafe's guidance stresses shutting down energy sources and releasing stored energy before work proceeds. 

Lockout is not a substitute for better machine design. WorkSafe describes lockout and tagout as an administrative measure that sits lower in the hierarchy than controls that physically remove or isolate a hazard. A court made a similar point in the Kiwi Lumber case, noting that lockout systems depend heavily on training, supervision and human behaviour, while interlocked guarding can provide a stronger physical control. 

That distinction becomes particularly important when workers regularly enter hazardous areas. Repeated intervention increases the number of occasions on which a missed step, misunderstanding or lapse can expose someone to moving plant. 

Current benchmark

The 2026 revision also brings WorkSafe's general machinery guidance into line with newer technical standards.

The guide now refers throughout to AS/NZS 4024:2019. WorkSafe describes that standards series as representing the current state of knowledge for safeguarding machinery and plant and says businesses should use it as the primary benchmark. Other standards can be used where they achieve an equivalent or higher level of safety in the circumstances. 

The standards do not replace the law. WorkSafe states that following AS/NZS 4024:2019 does not, by itself, guarantee compliance with the Health and Safety at Work Act or relevant regulations. The legal question remains whether the duty holder has managed the particular risk as required. 

The revised guide also includes a hazard-identification checklist shaped around how machinery is actually used. It asks about guards, controls, power transmission, electrical hazards, training, protective equipment, cleaning, repairs, lockouts and the physical layout around machinery. 

That reflects a broader shift in New Zealand machinery safety. The focus has moved from treating a guard as a standalone compliance item towards examining the full life of a machine: its design, supply, installation, operation, cleaning, modification, maintenance and eventual decommissioning. Designers, manufacturers, importers, suppliers, installers and users can all have responsibilities. 

Yet the basic safety question has changed little since machinery guarding entered New Zealand law more than seven decades ago. Businesses still need to determine how someone could be caught, crushed, cut or drawn into equipment, then prevent that exposure using the strongest reasonably practicable controls. The June 2026 update puts those long-established principles into the language, standards and risk-management structure of today's workplace safety system.