HK Grade B Electrical Worker Exam case studies
HK Grade B Electrical Worker Exam · Put your knowledge to work in context.
The Grade B Electrical Worker qualification is issued under Hong Kong's electricity legislation and is administered by the Electrical and Mechanical Services Department (EMSD). It is the middle tier of the local electrical worker grades: it permits a registered worker to carry out electrical work of a defined scope on fixed installations, and it is the grade most contractors, property managers and maintenance employers ask for when hiring for installation, alteration, repair and maintenance duties. The HK Grade B Electrical Worker Exam case studies are 5 cases and about 2,697 words.
1Motor CPC Continuity in a Wet Plant Room
A factory maintenance team has installed a new 7.5 kW, 380 V three-phase pump motor in a wet plant room. The motor is fed from a local sub-board by a 4-core 4 mm² PVC/SWA cable, with the armour used as the circuit protective conductor (CPC) at the motor end.
552 words, about 3 min2Combi Oven Cable Sizing in a Restaurant Kitchen
A restaurant kitchen is adding a 24 kW, 380 V three-phase combi oven with a power factor of 0.95. The oven will run for about four hours per day.
574 words, about 3 min3DOL Motor Tripping on Start
A 15 kW, 380 V, three-phase induction motor drives a conveyor. The motor has a full-load current of 30 A, a power factor of 0.85 and an efficiency of 0.90.
537 words, about 3 min4Cumulative Leakage Tripping a Domestic RCBO
A 15-year-old domestic flat has a 30 mA RCBO protecting the kitchen socket circuit. The owner has added a washing machine, dishwasher, fridge-freezer, microwave and small counter appliances.
442 words, about 2 min5Electric Shower in a Hotel Bathroom
A small hotel is refurbishing an ensuite bathroom. The existing 8.5 kW, 220 V instantaneous electric shower is to be retained.
592 words, about 3 min