Electrical Machine Compliance and Safety Design in Melbourne
ARA Electrical Services provides machine safety engineering and electrical machine compliance for industrial sites across Melbourne. Our engineers hold TUV certification and have direct experience delivering AS 4024 risk assessments, safety system design, and machine safety upgrades on manufacturing and processing plant of varying age and complexity.
Machine compliance on industrial sites is rarely straightforward. Most of the issues we find involve plant that has been modified or extended over time, where the safety systems have not kept pace with how the machine is now used. Emergency stop architectures that no longer cover all hazardous zones, guarding that does not account for maintenance access, and safety circuits implemented at Category 1 where the risk assessment requires Category 3 or 4 — these are common findings, and they require engineering to resolve properly.
Machine Safety Risk Assessments
Every machine safety project starts with a structured risk assessment in accordance with the AS 4024 series. The assessment covers all modes of machine operation — production, setup, cleaning, fault clearance, and maintenance — with particular attention to how operators and maintenance personnel access the machine, how the machine is reset and restarted, and whether existing guarding and interlocking adequately controls access to each identified hazard.
The outcome of the risk assessment is a documented set of required safety functions and the Performance Level (PLr) that each must achieve, determined in accordance with ISO 13849 (AS 4024.1501). That forms the engineering basis for all subsequent design and upgrade work.
Safety System Design and Performance Level Verification
- Stop categories and defined safe states for each hazardous condition
- Emergency stop system architecture, coverage, and response time requirements
- Guard interlocking arrangements and safe zone entry control
- Restart inhibit logic and reset conditions
- Diagnostic coverage and common cause failure requirements for Category 3 and 4 systems
On older plant where control systems have been built up incrementally over time, the design process often uncovers a significant gap between what the installed system achieves and what the risk assessment requires. Identifying and closing that gap is the core of what machine safety engineering involves.
Machine Guarding Design
Machine guarding is the primary risk control measure for most mechanical hazards under AS 4024. Guarding needs to physically prevent access to hazardous zones during normal operation while remaining practical for maintenance, tooling changes, and material feed. Where fixed guarding alone is not sufficient, interlocked guarding, light curtains, area scanners, or two-hand controls are specified based on the risk assessment outcome and the required Performance Level.
ARA designs guarding arrangements to the safety distance requirements of AS 4024.1601, ensuring guarding geometry is correct and that interlocked guarding is properly integrated with the control system safety architecture. Guarding that is geometrically incorrect or interlocked in a way that does not achieve the required Performance Level does not meet the standard regardless of its physical quality.
Safety PLC Programming and Commissioning
Where safety functions are implemented through safety-rated PLCs or safety relay systems, ARA provides programming, configuration, and commissioning. Safety PLC logic is written to align directly with the risk assessment outcomes and safety function definitions. Commissioning includes functional testing of all safety inputs and outputs, verification of stop category and response time, validation of restart inhibit and reset behaviour, and Performance Level verification against the ISO 13849 architecture requirements.
Machine Safety Engineering and Installation Services
- Machine safety risk assessments to AS 4024 series
- Safety function design and Performance Level determination to ISO 13849
- Machine guarding design to AS 4024.1601 safety distance requirements
- Safety PLC programming and safety relay configuration
- Safety validation testing and compliance reporting
- Machine safety upgrades on existing and legacy plant
- Supply and installation of guards, interlocks, light curtains, and E-stop systems
- Site-wide emergency stop upgrades and machine safety programmes
- Hazardous area machine safety installations
Electrical Machine Compliance in Melbourne
