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9. (a) Using notes and freehand sketches, show the electrical wiring layout for two lights and two switches in a radial circuit of a dwelling house - Leaving Cert Construction Studies - Question 9 - 2008
Question 9
9. (a) Using notes and freehand sketches, show the electrical wiring layout for two lights and two switches in a radial circuit of a dwelling house. Indicate on th... show full transcript
Worked Solution & Example Answer:9. (a) Using notes and freehand sketches, show the electrical wiring layout for two lights and two switches in a radial circuit of a dwelling house - Leaving Cert Construction Studies - Question 9 - 2008
Step 1
Using notes and freehand sketches, show the electrical wiring layout for two lights and two switches in a radial circuit of a dwelling house.
Answer
To sketch the radial circuit for two lights and two switches, follow these steps:
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Draw the Circuit Layout: Begin by sketching a simple representation of the dwelling house layout. Include the positions of the two lights and the two switches in the diagram.
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Indicate Wire Sizes: Use appropriate symbols to depict the wiring. The typical sizes for the wire cables are:
- 1.5 mm² for lighting circuits, using Twin and Earth cable.
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Colour Coding: Indicate the typical colour coding for the electrical wires:
- Brown for live (L)
- Blue for neutral (N)
- Yellow/Green for earth (E)
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Label Components: Clearly label the lights and switches in your diagram. Show their connections and ensure there are junction connections as needed.
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Final Touches: Ensure the sketch is neat, with necessary component labels and sizes visible for assessment.
Step 2
Using notes and freehand sketches, show two safety features in the design of the lighting circuit that ensure that it is safe for all users.
Answer
For the safety features, include the following:
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MCB and RCD: Draw a Miniature Circuit Breaker (MCB) connected to each circuit, and indicate a Residual Current Device (RCD) as an essential device to prevent electrical shock.
- Label these components and their connections in the diagram.
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Wiring Safety Practices: Indicate that all wiring must adhere to safety standards, such as using junction boxes for all connections and ensuring that no neutral is connected from another circuit.
- Show that the switch must be on the live side of the lighting circuit.
Step 3
Using notes and freehand sketches, show two features that should be incorporated into the design of the lighting system of a dwelling house to ensure the economical use of electricity.
Answer
Incorporating design features for economical use of electricity can include:
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Lighting Controls: Sketch automated lighting controls, such as occupancy sensors and timers that turn lights on/off as needed. Demonstrate how these features can minimize energy wastage.
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Energy-Efficient Lighting: Depict the use of energy-efficient light sources, like Compact Fluorescent Lamps (CFLs) or LEDs. Indicate their benefits such as reduced energy consumption compared to traditional bulbs, along with potential renewable energy sources like solar panels.