HSC Electrotechnology (VET) case studies
HSC Electrotechnology (VET) · Put your knowledge to work in context.
The HSC Electrotechnology course sits within the Stage 6 VET Board Endorsed courses (VET BECs) published by NESA, the NSW Education Standards Authority. VET BECs are designed for Year 11 and 12 students and give them practical skills and experience to confidently step into work, further training, or even a related university course. The HSC Electrotechnology (VET) case studies are 5 cases and about 2,985 words.
1Fault-finding a tripping RCD in a workshop sub-board
A school technology workshop is fed from a 32 A sub-main protected by a 30 mA Type II (non-delayed) residual current device. Since a new bench grinder and two extra double GPOs were installed, the RCD trips intermittently, usually a few minutes after the grinder starts under load, and sometimes when the workshop is empty overnight.
676 words, about 3 min2Choosing cable size for a long run to a welder outlet
A customer wants a 15 A single-phase outlet installed for a portable welder at the far end of a 42 m run from the main switchboard. The welder draws a continuous 12 A with an inrush of about 60 A for a fraction of a second at strike.
611 words, about 3 min3Deciding whether a motor circuit needs a contactor upgrade
A three-phase 415 V, 7.5 kW induction motor drives a dust extractor in a workshop. The existing starter uses a contactor rated AC-3 at 9 kW at 415 V and a thermal overload set to 14 A.
573 words, about 3 min4Deciding on a safe isolation and testing sequence for a switchboard upgrade
An electrician is asked to add a new 32 A three-phase circuit to a live distribution board in an occupied building. The board has a main switch, a busbar system, and existing circuits that include a lift supply and a fire-panel supply that must remain energised.
572 words, about 3 min5Selecting and terminating data cabling in an electrically noisy plant room
A contractor is installing a small data network in a plant room that contains variable-speed drives, contactors, and 415 V motor cables. The run from the patch panel to a monitoring PC is 85 m.
553 words, about 3 min