This describes the essential skills and knowledge and their level required for this unit Evidence shall show that knowledge has been acquired of safe working practices and designing switchboards rated for high fault levels All knowledge and skills detailed in this unit should be contextualised to current industry practices and technologies KSEGA Switchboard design Evidence shall show an understanding of the design of low voltage switchboards rated for high fault currents to an extent indicated by the following aspects T Trade calculations encompassing mathematical techniques relevant calculations linear measurement areas volumes ratios T Engineering mechanics encompassing base physical quantities concepts principles SI units their applications in engineering calculations in relation to physical quantities and associated formulae mass velocity acceleration force weight density angles energyworkpower momentstorque centre of gravity mechanical advantage levers pulley blocks efficiency friction vectors resolution of forces forces in strung conductors forces on poles and towers determination of sag pressurestress elementary fluid mechanics T Engineering materials encompassing classification ferrous and nonferrous metals steels alloys properties tensile strength temperature and expansion in metals stress and strain ductility applications corrosion galvanic corrosion hardwoods and soft woods T Fault current calculations encompassing Calculation of fault currents CalculationDetermination of positive negative and zero sequence impedances Determination of fault current breaking and letthrough energy capacities of protection devices The influence of faultarc impedances Impedances operative for phasetophase and phasetoearth faults Calculation of fault currents for phasetophase and phasetoearth faults Approximation calculations by selecting the components with the major impedance |