SA Master Installation Electrician key terms

The joint Australian/New Zealand Wiring Rules that set mandatory requirements for electrical installations, covering design, construction, verification and protection of wiring systems.

All wiring, accessories, switchgear, appliances and equipment installed for supplying or using electrical energy at a premises, from the point of supply to the final subcircuits.

The point where the electrical supply authority's responsibility ends and the consumer's installation begins, usually at the main switchboard or metering point.

The greatest electrical load, calculated using diversity and load-group rules, that an installation or circuit is expected to draw under normal operating conditions.

A multiplier applied to connected load to account for the fact that not all loads operate simultaneously, reducing the calculated maximum demand.

A category of appliances or equipment with similar usage patterns, used in maximum demand calculations to apply appropriate diversity factors.

Connection of exposed conductive parts and the main earthing terminal to earth so that fault current can flow and protective devices operate to disconnect supply.

Electrical connection of all exposed and extraneous conductive parts to ensure they remain at substantially the same potential, reducing shock risk during faults.

A conductive part that is not part of the electrical installation but may introduce a potential, such as metal water pipes or building steel.

A conductive part of electrical equipment that can be touched and is not normally live but may become live under fault conditions.

The total impedance of the path taken by fault current from the point of fault back to the supply source, used to verify that protective devices will operate within the required time.

The maximum current that would flow at a given point in an installation if a short circuit or earth fault occurred there, used for selecting switchgear and protective devices.

A device such as a circuit breaker, fuse or residual current device that automatically disconnects supply when a fault or overload is detected, protecting people and equipment.

A protective device that monitors the difference between live and neutral currents and trips when a small earth leakage current is detected, providing personal protection against electric shock.

Coordination of protective devices so that the device nearest a fault operates first, minimising disruption to the rest of the installation.

The property of a protection scheme whereby a fault is cleared by the designated device without unnecessary operation of upstream devices, often achieved by time or current grading.

The maximum continuous current a cable can carry under specified installation conditions without exceeding its temperature rating, after applying derating factors.

A multiplier less than one applied to a cable's tabulated current rating to account for adverse conditions such as grouping, ambient temperature, or thermal insulation.

The reduction in voltage along a circuit due to conductor impedance, which must be limited to ensure equipment operates correctly and within regulatory limits.

The way cables are installed (e.g., clipped to a surface, buried, in conduit, in thermal insulation), which affects heat dissipation and therefore current-carrying capacity.

An area where explosive gas, vapour, dust or fibres may be present in quantities that could ignite, requiring special equipment and installation practices.

A system that categorises hazardous areas by the likelihood and duration of explosive atmospheres, such as Zones 0, 1 and 2 for gases, to determine equipment requirements.

Electrical equipment designed and certified to prevent ignition of surrounding explosive atmospheres, often marked with an Ex rating and suitable for specific zones.

The process of inspecting and testing an electrical installation to confirm it complies with AS/NZS 3000 and other requirements before it is placed into service.

The measurement and assessment of electrical parameters such as insulation resistance, continuity, polarity and fault loop impedance to confirm installation safety and compliance.

A formal document, often called a Certificate of Electrical Safety, issued by a licensed electrician to certify that the electrical work complies with regulations and standards.

The systematic process of identifying the cause of an electrical malfunction using observation, testing and logical elimination to determine necessary repairs.

Scheduled inspection, testing and servicing of electrical equipment to prevent failures, maintain safety and extend the life of the installation.

The process of eliminating or minimising workplace hazards by applying the hierarchy of controls, from elimination and substitution to engineering and administrative controls.

A ranked system of hazard control measures: eliminate, substitute, isolate, engineer, administrate, and use personal protective equipment as the last resort.

A document that outlines the high-risk construction work activities, associated hazards, and control measures to be implemented, required before work commences.

A procedure that breaks a job into steps, identifies hazards at each step, and specifies controls to manage risk before and during the task.

A safety procedure used to ensure dangerous machines or circuits are properly shut off and not started up again before maintenance or repair is completed.

The process of disconnecting electrical supply from an installation or circuit and securing it against reconnection to allow safe work to proceed.

The regulatory requirement for electricians to hold a current licence or registration to legally perform electrical work, demonstrating competence and accountability.

The professional management of interactions with clients, including clear communication, quoting, complaint handling, and ensuring work meets agreed expectations and regulations.

The legal duties and responsibilities agreed between parties in a contract, such as completing work to standard, within time, and for the agreed price.

The duties of a licensed electrician to oversee the work of apprentices or other workers, ensuring compliance, safety and quality of electrical installation.

The resistance measured between live conductors and earth, or between conductors, used to verify that insulation is intact and safe.

The correct connection of active, neutral and earth conductors to their intended terminals, ensuring switches and protective devices are in the active conductor.