8) Essential knowledge and associated skills (EKAS): This describes the essential skills and knowledge and their level, required for this unit. Evidence shall show that knowledge has been acquired of laying, installing and maintaining LV underground cables. All knowledge and skills detailed in this unit should be contextualised to current industry practices and technologies. KS01-TCJ33A Network infrastructure LV underground cables Evidence shall show an understanding of installation and maintenance of network infrastructure LV underground cables to an extent indicated by the following aspects: T1 Transmission, distribution and rail systems encompassing: Relationship between the transmission, distribution and rail/tram system within an overall power system - different organisations responsible for generation, transmission, distribution and rail/tram and, how they correlate and their functions Characteristics of a transmission, a distribution and a rail system - principal components, typical voltage levels and methods of transmission and distribution including grid type transmission systems, radial, parallel and ring main feeders Relationship between an overhead and underground supply systems within an overall power system - advantages/disadvantages, applications and the basic steps for planning and installing an overhead and underground distribution system Single line drawings and layouts - drawings and layouts of transmission and distribution systems including, radial, parallel and ring main feeders and the HV equipment associated with substations T2 Substations, power transformers and reactors encompassing: Relationship between the substations within an overall power system - purpose, location in relation to load centres, layout of HV equipment within the substation and auxiliary equipment Characteristics of a power transformer - basic construction of distribution transformers, operation under load/no load conditions, types and basic operation of tap changing switches including solid state types, efficiency and cooling Auxiliary equipment used on transformers - function and basic operation of equipment Maintenance of a power transformer - basic connections, restrictions to parallel operation, problems and remedies associated with harmonics, testing and fault finding procedures Description, purpose and characteristics of a reactors T3 Powerline safety practices encompassing: Protective apparatus and apparel for linework - responsibilities for the selection, use, maintenance and storage of protective apparatus and apparel and the types of protective apparatus and apparel used for the line worker Requirements for the use of ladders - carrying, erecting, collapsing and lowering different types of extension ladder against a standing pole, maintenance checks on different types of ladders, renewal of extension ropes and the safety issues relating to clearances from overhead conductors Requirements for climbing and working aloft - methods used to identify a pole is safe to climb, methods used to inspect a line worker’s body belt, application of knots and hitches appropriate to the requirements of a line worker, height safety principles including personal fall protection, prevention and related requirements, and the practical procedure of climbing an overhead structure and fitting a pole chair Traffic management - purpose of traffic management and a line worker’s responsibilities in accordance with relevant statutory requirements and electricity supply industry requirements, demonstration of the procedure used to provide an effective traffic management scheme and the use of a two-way radio Control of small fires - identification, selection and operation of the appropriate extinguishing mediums for various types of fires, general fire prevention methods and the precautions for personal protection when fighting small fires Rescue victims from heights and confined spaces - planning, identifying, the procedures, and establishing responses, developing techniques, involvement of external emergency services and practical demonstration/rehearsals of rescuing a person from heights and from confined spaces and emergency procedures for the rescue of an electric shock victim including CPR Requirements for aerial linework - planning, establishing and implementing relevant aviation authority clearances, determining system requirements, aircrew familiarisation with network operations and equipment, requirements for effective communications operations for aerial work T4 Procedure in providing store support encompassing: Classification and identification of equipment, components and tools Procedures for purchasing/ordering items, removing/dispatching items, stocktaking, security, bookkeeping/record keeping Material handling - warehouse/depot storage techniques, handling equipment, pallet lift trucks, forklifts Cable drum handling equipment Safety procedures - storage and care of safety equipment, handling hazardous materials, storage of hazardous substances and dangerous goods, depot safety procedures, manufacturers and suppliers information including material safety data sheets (MSDS) T5 Installation of underground cable encompassing: Requirements for the use of enterprise construction manuals, system diagrams/plans and drawings Safety precautions specific to the installation of underground cable - excavation and trench safety regulations, gas detection procedures, working in confined spaces, personal protective equipment, hazards for the use of LPG equipment for jointing of underground cable, gas bottle testing procedures, permit to work systems and isolation procedures. Trench excavation and reinstatement procedures Installation of underground cable procedures - types of tools and equipment, methods of installing conduits, methods of installing cables and sealing cable ends (direct buried, ducts cleated and racked) Procedures for the safe use of LPG equipment for cable jointing T6 LV polymeric cable jointing principles encompassing: Techniques in jointing LV XLPE cables - straight through joint, jointing different types of cable and service and street light cable joints Techniques in terminating LV XLPE - pole top terminations, substation terminations, distribution pillar /column/cubicle terminations and service and street light cable terminations Techniques in repairing LV XLPE cable - different types of damage, repairs to sheath, repairs to cores Methods of testing cable after jointing T7 Jointing and termination of LV polymeric cable encompassing: Standards, codes, legislation, supply authority regulations and or enterprise requirements pertaining to the jointing of LV polymeric cables Types of cables - single core, multi core and XLPE insulation Methods of cable handling - direct laid cables, duct laid cables, solid laid cables, cables supported in cleats or hangers Corrosion protection Minimum bending radius of cables Methods of cable sealing - shorting of cables cores, core of un-terminated cables Methods of protection from corrosion Polymeric sheathed cables sealing with mastic lined Heat shrink caps buried sealed ends Types of jointing tools - general hand tools, compression tools Techniques in the use of LPG - safety precautions, personal protective equipment, general maintenance and repair Safety precautions when cable jointing -working in confined spaces, permit to work systems and isolation procedures and emergency rescue/response including First Aid T8 Underground cables construction and types encompassing: Safety precautions specific to handling underground cables Requirements for the use of enterprise manuals, system diagrams/plans and drawings Types and applications of UC Construction types and structures of underground cables Characteristics of different types of underground cables Ratings |