Evidence shall show that knowledge has been acquired of safe working practices and attaching cords and plugs to electrical equipment for connection to a single phase 230 Volt supply. All knowledge and skills detailed in this unit should be contextualised to current industry practices and technologies. KS01-EP024A Flexible cords and plugs to 230 V Evidence shall show an understanding of flexible cords and plugs to 230 V to an extent indicated by the following aspects T1 Safety encompassing: OH&S and electrical safety requirements requirements of AS/NZS 4836:2001 Safe working practices on low voltage installations T2 The basic electrical circuit encompassing: simple electric circuit (supply, control device and load) symbol, units of measurement and the abbreviation for electromotive force, potential difference, current and resistance. drawing of a basic electrical circuit using correct symbols using multiples and submultiples for voltage, current and resistance values a.c and d.c supplies single phase electrical loads electrical circuit protection devices T3 Relationships in an electrical circuit encompassing: 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 T4 Test Equipment - resistance measurement encompassing: 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 equipment reasons for insulation resistance testing is conducted at higher than supply voltage (AS/NZS3000 requirements) using insulation resistance hand held tester care and storage of electrical instruments regulatory requirements in regard to the maintenance and testing of test instrumentation for resistance measurement. T5 Selection of flexible cords and plugs to suit given applications encompassing: types , structures and applications of common cores (parallel two core unsheathed (‘figure 8’) cords, light duty sheathed, ordinary duty sheathed, heavy duty sheathed and textile braided) determining the current rating of a range of commonly used flexible cords service duty purpose of colour coding and the recommended single phase colour code and the conventional code used in the most common alternative colours selection of appropriate flexible cords for a range of single phase appliances in regard to application, load, and service duty identification of correct plug and socket polarities for the range of commonly used 230 volt plug socket combinations factors affecting the choice of plugs and sockets including IP rating selection of the correct plug and socket combinations for a range of applications including use in damp areas T6 Connecting flexible cords and plugs to appliances encompassing: 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 fitting a range of various plugs and sockets with attention to requirements, colour code, polarity, and correct termination of conductors with the sheath well into the body, and the cord grip anchored terminate cords to several appliances utilising the appropriate cord type and rating T7 Testing encompassing: importance of conducting both visual and electrical tests to ensure leads are safe and appropriate for connection to supply in regard to physical condition, sufficiently high insulation resistance, continuity, arrangements for protection against indirect contact are undamaged and in place, appropriate IP rating, and arrangements for protection against dangers of mechanical movement as relevant are undamaged and in place check polarity of plug, and for any abnormal or obvious damage or fault minimum acceptable value of insulation resistance between active neutral and earth conduct insulation resistance and continuity tests prior to, and after, connecting cords and plugs to appliances fault finding attached cords and plugs, and cord extension leads T8 Producing documentation and reports encompassing: nature and content of, and the need to produce, status reports and documents Producing status reports and documents |