Product Overview

Summary: This Electrical System Diagnostic Safe Operating Procedure sets out a clear, step-by-step method for safely fault-finding and testing electrical systems in Australian workplaces. It helps technicians identify issues efficiently while controlling electrical risks, supporting compliance with WHS duties and electrical safety regulations across workshops, facilities, and field service environments.

Electrical diagnostics is one of the highest-risk activities carried out in many workplaces, particularly where live testing, complex control panels, and mixed new/legacy installations are involved. Without a structured procedure, technicians may adopt inconsistent methods, bypass safety controls, or miss critical isolation steps, exposing themselves and others to electric shock, arc flash, equipment damage, and unplanned outages. This Electrical System Diagnostic Safe Operating Procedure provides a clear, repeatable framework for planning, conducting, and documenting diagnostic work on low-voltage electrical systems and associated plant in line with Australian WHS expectations.

The SOP guides workers from initial job assessment and verification of documentation, through lock-out/tag-out, safe testing practices, fault isolation, and confirmation of rectification. It embeds key WHS principles such as risk assessment, hierarchy of control, and safe work on or near energised equipment, while also addressing practical realities like production pressures and after-hours call-outs. By implementing this procedure, businesses can standardise diagnostic practices across teams, reduce downtime from misdiagnosis, and demonstrate due diligence under electrical safety and general WHS legislation in every state and territory.

Key Benefits

• Ensure electrical diagnostic work is carried out in a consistent, controlled and WHS-compliant manner.
• Reduce the risk of electric shock, arc flash, and equipment damage during testing and fault-finding.
• Improve diagnostic accuracy, reducing repeat call-outs, downtime and unnecessary part replacements.
• Support compliance with Australian electrical safety legislation and AS/NZS standards for testing and isolation.
• Provide clear guidance for training new technicians and reinforcing safe habits among experienced staff.

Who is this for?

• Electricians
• Electrical Technicians
• Maintenance Electricians
• HVAC Technicians
• Service and Repair Technicians
• Maintenance Supervisors
• Facilities Managers
• WHS Managers
• Workshop Managers
• Engineering Managers

Hazards Addressed

• Electric shock from contact with live conductors or exposed terminals
• Arc flash and arc blast during testing or when removing covers and panels
• Short circuits and equipment damage caused by incorrect test methods or test lead placement
• Uncontrolled energisation of circuits during diagnostic work due to inadequate isolation and tagging
• Burns from hot components, cables or faulted equipment
• Falls or strains while accessing switchboards, ceiling spaces or elevated plant for testing
• Fire ignition from faulty wiring, overloaded circuits or misapplied test equipment
• Exposure to hazardous environments (confined spaces, damp areas, explosive atmospheres) during electrical testing

Included Sections

• 1.0 Purpose and Scope
• 2.0 Definitions and Abbreviations
• 3.0 Roles, Responsibilities and Competency Requirements
• 4.0 Applicable Legislation, Standards and Codes of Practice
• 5.0 Tools, Test Instruments and Personal Protective Equipment (PPE)
• 6.0 Pre-Diagnostic Planning and Risk Assessment
• 7.0 Verification of Documentation, Drawings and System Information
• 8.0 Isolation, Lock-Out/Tag-Out (LOTO) and Proving De-energised
• 9.0 Safe Work on or Near Energised Equipment (Exceptional Circumstances)
• 10.0 Step-by-Step Electrical Diagnostic Procedure
• 11.0 Use of Test Instruments and Measurement Techniques
• 12.0 Managing Specific System Types (Motors, Control Circuits, HVAC, Power Circuits)
• 13.0 Hazard Identification and Control Measures During Diagnostics
• 14.0 Re-energisation, Functional Testing and Verification of Rectification
• 15.0 Documentation, Reporting and Recordkeeping Requirements
• 16.0 Incident, Near Miss and Equipment Damage Reporting
• 17.0 Training, Competency Assessment and Refresher Requirements
• 18.0 Review, Audit and Continuous Improvement of the Procedure

Legislation & References

• Work Health and Safety Act 2011 (Cth) and corresponding WHS Acts and Regulations in each state and territory
• AS/NZS 3000:2018 Electrical installations (Australian/New Zealand Wiring Rules)
• AS/NZS 4836:2011 Safe working on or near low-voltage electrical installations and equipment
• AS/NZS 3017:2007 Electrical installations – Verification guidelines
• AS/NZS 3760:2022 In-service safety inspection and testing of electrical equipment
• Safe Work Australia – Model Code of Practice: Managing electrical risks in the workplace
• Safe Work Australia – Model Code of Practice: How to manage work health and safety risks