electrical safety requirements, including the requirements of AS/NZS 4836 Safe working on low-voltage electrical installations basic electrical circuits, including: simple electric circuit (supply, control device and load) industry standard symbols, units of measurement and the abbreviation for electromotive force, potential difference, current and resistance using multiples and sub-multiples for voltage, current and resistance values a.c and direct current (d.c.) supplies single phase electrical loads electrical circuit protection devices relationships in an electrical circuit, including: relationship between voltage, current and resistance (Ohm’s Law) changes in circuit parameters for altered values of voltage, current and resistance electrical power in relationship to d.c. or resistive a.c. circuits test equipment - resistance measurement, including: types of electrical test equipment used for resistance measurement (analogue and digital multimeters, insulation resistance testers and continuity testers) selection of appropriate electrical test instrument for continuity and insulation resistance measurement using analogue and digital multimeters for resistance measurement (ensuring zero setting, correct scale selection, avoidance of parallax error and estimation of between division readings for analogue multimeters) continuity tests and using a continuity tester to check the polarity of a three-core extension cord insulation resistance tests and minimum values for insulation resistance for low voltage (LV) equipment reasons for insulation resistance testing is conducted at higher than supply voltage to relevant industry standards using insulation resistance handheld tester care and storage of electrical instruments regulatory requirements relating to the maintenance and testing of test instrumentation for resistance measurement selection of flexible cords and plugs to suit given applications, including: types, structures and applications of common cores, including: parallel two core unsheathed (‘figure 8’) cords, light duty sheathed ordinary duty sheathed heavy duty sheathed textile braided service duty purpose of colour coding and the recommended single phase colour code conventional code used in the most common alternative colours factors affecting the choice of plugs and sockets, including ingress protection (IP) rating connecting flexible cords and plugs to appliances, including: design features of plugs and sockets which protect the conductor terminations from undue force when disconnecting a cord - tortuous path cord preparation - not to mark/damage the inner core when stripping the sheath for termination, double the end of the conductor to be terminated purpose of earthing structure of double insulated appliances, symbol, reasons they should not be earthed, and maintenance of the integrity of the double insulation preparation of the surfaces at an earthing connection before and after completion of the termination, including terminations exposed to corrosion, and those for which no specific earthing terminal is provided techniques for fitting plugs and sockets techniques for terminating cords and conductors including consequences of poor electrical terminations testing, including: importance of conducting both visual and electrical tests to ensure leads are safe and appropriate for connection to supply in regard to physical condition checking the polarity of plug, and for any abnormal or obvious damage or fault minimum acceptable value of insulation resistance between active neutral and earth conducting insulation resistance and continuity tests prior to, and after, connecting cords and plugs to appliances visually checking that the cord/plug assembly has a suitable IP rating for the operating environment visual checks to ensure that arrangements for protection against dangers of mechanical movement as relevant are undamaged and in place techniques for fault finding attached cords and plugs, and cord extension leads producing documentation and reports, including: nature and content of, and the need to produce, status reports and documents relevant WHS/OHS legislated requirements including inspection and testing of electrical equipment relevant industry standards relevant manufacturer specifications and operating instruction for tools, equipment and testing devices relevant safe job safety assessments or risk mitigation processes relevant workplace policies, procedures and instructions, including relevant workplace quality procedures. |