Reference no: EM133107782
Electrical Systems and Fault Finding
Chapter 1: Investigate the constructional features and applications of electrical distribution systems
P1 Describe to the supervising engineer the features of an electrical distribution system for a residential building. Giving the description of the main switchboard after the transformer and how the power goes up to each floor of this building.
- Describe the customer main switchboard including the typical connection with transformer
- Describe the rising main system (refer HK Electric documents)
- Describe vertical and horizontal busbar trunking
- Put diagrams if necessary for illustration
P2 Your supervising engineer also asks you to discuss and review the electrical components symbols used in 2 circuit diagrams, namely the lighting and power circuit diagrams.
- Discuss and review the electrical system of MEP (Mechanical, Electrical and Plumbing) of BIM (Building Information Modelling) (e.g. Autodesk Revit)
- Review the typical components of electrical systems
- Review the application in the lighting and power circuit diagrams
P3 Please also explain to the supervising engineer how the single and three phases connections can be distributed and installed.
- Explain the conditions to provide single or three phase to customer
- Explain single and three phases supply
- Explain single and three phases meter installation
- Explain single and three phases connections distribution
Chapter - Examine the types and applications of electrical motors and generators
P4 Your supervising engineer asks you to prepare to explain different types of motors and generators available. You can talk about the common ones that you may expect in the building services industrial for buildings.
- You can explain the following machines
•Induction machine as motor or generator
•Permanent magnet synchronous machine as motor or generator
•DC machine as motor or generator
•Step motor
P5 In addition, you should be also conversant in giving your opinions on how to select the suitable motors for different industrial applications like the water pumps and for large air-handling units
- Discuss motor selection criteria
- Take large water pumps as example to analyze the requirements, then apply the motor selection criteria to select suitable motors
- Take large air-handling units as example to analyze the requirements, then apply the motor selection criteria to select suitable motors
P6 Then he further asks you to prepare and give your reviews on at least 2 different ways to start induction motors and synchronous machines
- Review the starting method of induction motors and synchronous machines, e.g.
•Slip-ring rotor starting method
•Star-delta starting
P7 Examine and investigate the types and construction of lighting devices commonly used in residential buildings. You can discuss the existing and more new lighting fitting.
- Examine and investigate the types and construction of lighting devices commonly used in residential buildings, e.g.
•Direct luminaries
•Indirect luminaries
•Direct/indirect luminaries
•Downlights
•Spotlights
P8 Explore a suitable lighting type for the main lobby of a residential building and consider its characteristics.
- Analyze the requirement of main lobby
- Apply lighting design for the main lobby of a residential building
- Explore a suitable light type and consider its characteristics
P9 Prepare and describe the operations, types and uses of electrical safety devices including the circuit breakers and fuse system.
- Discuss the electrical safety devices requirement in Electricity (Wiring) Regulations and Factories and Industrial Undertaking (Electricity) Regulations
- Describe the operations, types and uses of electrical safety devices including
• Circuit breakers
• fuse
P10 Further list suitable safety components of a power supply to a 30KW Air Handling Unit.
- Outline the power connection from customer's main to the 30KW Air Handling Unit
- List suitable safety components for a power supply to a 30KW Air Handling Unit according to Hong Kong corresponding regulations, including
• Isolation and switch
• Overcurrent protection
• Neutral conductor protective devices, isolators and switches
• Earth leakage and earth fault currents
• Earth arrangement
• Switches, conductors and electric motors
Attachment:- Electrical Systems and Fault Finding.rar
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