8) This describes the essential skills and knowledge and their level, required for this unit. Evidence must show that knowledge has been acquired of safe working practices and making and assembling bus bars. All knowledge and skills detailed in this unit should be contextualised to current industry practices and technologies. KS01-EA112A Bus bar fabrication and assembly techniques Evidence shall show an understanding of bus bar fabrication and assembly techniques to an extent indicated by the following aspects: T1 Chemical and metallurgical properties of busbars encompassing: copper aluminium copper clad aluminium hard drawn copper annealing types of high conductivity copper T2 Design considerations encompassing: electrical and thermal resistance mechanical strength in tension, compression and shear resistance to fatigue failure electrical resistance of surface films ease of fabrication resistance to corrosion first cost and high eventual recovery value choice of busbar materials creep properties fatigue properties self extinguishing arcs in Cu and Al insulated busbar provision for busbar expansion T3 Busbar types encompassing: main bus bars intermediate bus bars cell bus bars droppers flexible joints hanger bars short-circuit frames T4 Current carrying capacity encompassing: standard cross sections of bar current ratings temperature rise T5 Shaping and bending equipment and techniques encompassing: hand and power tools hydraulic shears hydraulic punches hydraulic notcher machines allowing multiple operations T6 Jointing types and techniques encompassing: clamped joints bolted riveted welded soldered or brazed T7 Stand-off insulators encompassing: form function physical and electrical properties/characteristics selection T8 Effects of short circuit encompassing: temperature rise electromagnetic stresses cleats and structural supports |