Questions and Answers
What happens when a single breakout mounted breaker is removed?
The power automatically turns off
What is a challenge when handling drawout mounted breakers?
They are difficult to manipulate by hand due to their weight and size
How are drawout mounted breakers typically installed and removed?
By using a jacking screw and then hoisted onto a support
What must be done before testing and removing a drawout mounted breaker?
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What is a key difference between daylight and artificial lighting?
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What is a consideration when designing outdoor lighting systems?
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What is the lumen method of lighting design a measure of?
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What does a higher value of luminous efficacy indicate?
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What is the primary difference between daylighting and artificial lighting?
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What is essential for a successful floodlighting project?
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Why is it important to consider the appearance of a building at night-time during its design stage?
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What is the primary purpose of a ring main system in domestic wiring?
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What is the rating of a live conductor in a ring or power circuit?
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What is the purpose of an earth loop in a ring or power circuit?
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Why is it important to consider the aesthetic values of the architecture when floodlighting a building?
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What is the benefit of floodlighting ancient monuments and civic buildings?
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What is the main reason for providing a range of values for each lamp type?
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What is a key consideration when choosing fittings for outdoor use?
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What is a requirement for the daytime appearance of luminaires and columns?
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What type of lamps require adjustable mounting arrangements?
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Why is accurate aiming important in floodlighting systems?
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What is the primary purpose of electrical conduits and conduit fittings?
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What factors should be considered when selecting the material, size, and fittings of electrical conduits?
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Why is ease of access to the lamp, reflector, and front glass important in luminaires?
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Study Notes
Drawout Mounted Breakers
- Interlocked for safety, automatically turning off power when a single unit is removed
- Large and bulky, requiring a jacking screw and support for installation and removal
- Can be replaced without disconnecting power, but testing and removal require the load to be turned off
Conduit Systems
- Important considerations for daylight and artificial lighting
- Different orders of contrast and object relationships in daylight vs. artificial lighting
- Direction and distribution of light vary between day and night
- Lighting equipment must be visually acceptable in daylight
Lighting Design
- Lumen method measures lamp efficiency in converting electrical power to light
- Higher luminous efficacy indicates greater efficiency
- Daylighting is general and non-selective, while artificial lighting can reveal specific buildings
- Floodlighting can enhance architectural features and landscapes
Lighting Applications
- Bedrooms: consider lighting design in early stages to enhance interior features
- Halls: importance of lighting design in enhancing interior features
- Corridors: importance of lighting design in enhancing interior features
Basic Wiring Systems
- Two major ways of wiring in domestic buildings: ring main and radial systems
- Ring main system: fuse or miniature circuit breaker protected sub-circuit with a 32 amp rating
- Radial system: not specified in the provided text
Lighting Installation and Maintenance
- Consideration of design life and maintenance ease in choosing outdoor fittings
- Importance of initial cost, maintenance frequency, and economics in installation
- Daytime appearance of luminaires and columns should be in keeping with surroundings
- Mounting arrangements vary based on lamp type and burning position
- Accurate aiming and ease of access for relamping and cleaning are important
Electrical Conduits and Conduit Fittings
- Used to protect electrical cables and wires in various environments
- Material, size, and fittings chosen based on installation surroundings and wiring type
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