8) 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 overhauling and repairing major switchgear/controlgear. All knowledge and skills detailed in this unit should be contextualised to current industry practices and technologies. KS01-EG129A Switchgear and controlgear – 20 kA Evidence shall show an understanding of the switchgear and controlgear to an extent indicated by the following aspects: T1 Types and applications of switchgear and controlgear T2 Operating principles of switchgear and controlgear T3 Interlocking systems encompassing: external interlocking systems such as Castell Key systems internal interlocking systems for either safety or that operate in conjunction with say Castell Key systems T4 Control and protection of switchgear and controlgear T5 Installation requirements encompassing: operating specifications for equipment areas requiring repairs and maintenance determining if repairs/maintenance are to be carried in situ or in workshop environment relevant legislation and Standards applicable to the installation OHS issues with regard to removing/ re-installing heavy equipment electrical safety issues with regard to removing/ re-installing equipment understanding of CFC units T6 Electrical switchgear and controlgear protection methods encompassing: understanding of the operation of switchgear when it opens under load understanding on the settings and operation required for both magnetic short-circuit and thermal overload with equipment determining the earth fault loop impedance requirements required to keep touch voltage values within requirements thermal imaging techniques time/current curves from manufacturers specifications equipment to safely test switchgear after repairs or maintenance effectiveness of arc suppression installed within the equipment modern types of switchgear that are computer controlled and programmed modern types of switchgear that are interconnected to other protective devices certification process for any repair or maintenance work performed phase-failure systems Verifying the correct fault-level for the installation is consistent with the kA rating of the equipment x-ray and ultrasonic detection systems with regard to metallurgy different types of lubricants required for different locations, temperatures and humidity T7 Electrical safe working practices of working safely on or around electrical equipment encompassing: determining safe working Standards and codes of practice for equipment and installations over 20 kA OHS requirements for equipment and installations over 20 kA working knowledge of operating within the vicinity of live conductors, such as barriers procedures for working on switchgear over 20 kA risks and control measures associated with harmful dusts and airborne contaminants - sources include thermal insulation, fibrous cement materials and asbestos and other fibre reinforced switchboard materials checks and storage methods for maintaining the safety of testing devices |