QLD Electrical Licence flashcards
QLD Electrical Licence · Build recall with a focused review session.
32 cards. Read the term and the definition here. The deck at the top of this page is optional.
- Ohm's law
- For a resistive circuit, voltage equals current multiplied by resistance; current equals voltage divided by resistance; resistance equals voltage divided by current.
- Electrical power formula
- Power in a DC or resistive circuit equals voltage times current; also current squared times resistance or voltage squared divided by resistance.
- Three-phase power
- For a balanced three-phase load, real power equals the square root of three times line voltage times line current times power factor.
- Impedance
- Total opposition to alternating current, combining resistance and reactance; calculated as the square root of resistance squared plus reactance squared.
- Series circuit
- A circuit with one current path; the same current flows through all components and total resistance is the sum of individual resistances.
- Parallel circuit
- A circuit with multiple current paths; voltage is the same across each branch and total resistance is found from the reciprocal sum.
- MEN system
- Multiple earthed neutral system used in Australia; the neutral and protective earth are connected at the point of supply only, then separated throughout the installation.
- Protective earthing
- Connection of exposed conductive parts to the earthing system so fault current returns to source and protective devices operate to disconnect supply.
- Voltage drop limit
- AS/NZS 3000 generally limits voltage drop from the point of supply to any point of an LV installation to 5 percent of nominal voltage.
- RCD 30 mA
- Residual current device with maximum rated residual current of 30 milliamps, required by AS/NZS 3000 for specified final subcircuits to reduce electric shock risk.
- IP rating
- Ingress protection code; first digit indicates protection against solids and dust, second digit indicates protection against water, with higher numbers giving greater protection.
- Maximum demand
- The greatest load an installation is expected to draw, calculated using diversity and AS/NZS 3000 methods rather than simply adding all connected loads.
- Circuit segregation
- Separation of electrical, communications and data cables to prevent interference and unsafe contact; required by AS/NZS 3000 and communications standards.
- Electrical Safety Act 2002
- Queensland legislation imposing duties on PCBUs and others to ensure electrical safety and eliminate or minimise electrical risks to people and property.
- Electrical Safety Regulation 2013
- Queensland regulation supporting the Electrical Safety Act, covering licensing, safety requirements, testing, and adoption of AS/NZS 3000.
- Electrical Safety Office
- Queensland regulator administering electrical safety legislation, licensing, investigations, and compliance, often called the ESO.
- Electrical contractor licence
- Queensland licence required for a business to carry out electrical contracting work; individual electrical workers also need the appropriate worker licence.
- Primary duty of PCBU
- A person conducting a business or undertaking must ensure, so far as reasonably practicable, the health and safety of workers and others affected by the business.
- Incident notification
- Serious electrical incidents and dangerous events must be reported to the Electrical Safety Office or WorkSafe Queensland under Queensland safety laws.
- Insulation resistance test
- Test using an insulation tester at 500 volts DC with installation isolated; LV circuits should generally achieve at least 1 megohm.
- Continuity test
- Low-resistance test confirming protective earthing conductors and bonding connect exposed conductive parts to the earth bar.
- Polarity test
- Verification that active conductors are switched and connected correctly, neutrals are not switched, and socket outlets are wired to correct terminals.
- Earth fault loop impedance
- Impedance of the fault current path; must be low enough for the protective device to disconnect within the required time.
- RCD trip test
- Operational test of a residual current device using a tester to confirm it trips at its rated residual current and within the required time.
- Test for dead
- Confirming a circuit is de-energised using a proven voltage tester, checking all conductors and proving the tester before and after.
- Visual inspection
- Pre-test check of connections, enclosures, labels, damage, earthing, and IP integrity before electrical testing and energisation.
- Hierarchy of control
- Risk control order: eliminate the hazard, substitute, use engineering controls, then administrative controls, with personal protective equipment as the last resort.
- Lock out tag out
- Isolation procedure using locks and tags to prevent unexpected energisation while electrical work or maintenance is being performed.
- Arc flash
- Dangerous release of energy from an electrical arc, causing intense heat, light, pressure, and molten metal; avoid energised work and use arc-rated PPE.
- SWMS
- Safe work method statement; document identifying high-risk work hazards, control measures, and responsibilities before work starts.
- Electric shock response
- Isolate supply, call emergency services, start CPR and use a defibrillator if trained; do not touch the person until supply is isolated.
- Prove test instrument
- Check the voltage tester on a known live source before and after testing to confirm it is functioning and the circuit is actually dead.