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8. (a) Show, using notes and freehand sketches, the correct wiring layout for two electrical sockets in a ring mains circuit for a domestic electrical installation - Leaving Cert Construction Studies - Question 8 - 2012
Question 8
8. (a) Show, using notes and freehand sketches, the correct wiring layout for two electrical sockets in a ring mains circuit for a domestic electrical installation... show full transcript
Worked Solution & Example Answer:8. (a) Show, using notes and freehand sketches, the correct wiring layout for two electrical sockets in a ring mains circuit for a domestic electrical installation - Leaving Cert Construction Studies - Question 8 - 2012
Step 1
(a) Show, using notes and freehand sketches, the correct wiring layout for two electrical sockets in a ring mains circuit for a domestic electrical installation.
Answer
To illustrate the wiring layout for two electrical sockets in a ring mains circuit, we begin with a freehand sketch.
- Sketch Overview: Begin by sketching two electrical sockets labeled S1 and S2. Connect these outlets in a ring using lines that represent the copper wires.
- Cables Used:
- Live Wire (Brown): Connects from the power source directly to the sockets.
- Neutral Wire (Blue): Completes the circuit back to the electrical supply.
- Earth Wire (Green/Yellow): Provides a safety pathway for excess electricity.
- Sizes and Color Coding: Specify that the cables used are 2.5 mm² twin core and earth cables. Each of the wires should be color-coded correctly in your sketch.
- Labeling: Clearly label each wire to improve clarity in the circuit diagram.
Step 2
(b) Show, using notes and freehand sketches, two safety features that should be incorporated into the design of the above circuit to ensure that the circuit is safe for all users.
Answer
Incorporating safety features is paramount to secure electrical installations. Here are two critical features:
- RCD (Residual Current Device): This device disconnects the circuit if it detects an imbalance in electrical current flow, preventing electrocution and ground faults. Add an illustration showing where the RCD would be installed in the circuit.
- Fuse / MCB (Miniature Circuit Breaker): Include a fuse or MCB in your diagram, which will cut off the supply if current exceeds safe levels, preventing wiring overload. Indicate its placement near the circuit entry point.
Step 3
(c) Discuss in detail two strategies that would ensure the economical use of electricity in the home.
Answer
To ensure economical use of electricity in a home, consider the following strategies:
- Smart Metering: Implement smart meters to provide real-time energy usage data, allowing homeowners to adjust and reduce their consumption based on actual usage. This technology helps identify peak usage times and unnecessary energy expenditure.
- Energy-Efficient Appliances: Encourage the use of energy-efficient lighting (CFL and LED bulbs) and appliances. For example, replacing incandescent bulbs with CFLs can reduce energy usage significantly. Provide guidelines on replacing old appliances with more energy-efficient models that conform to energy standards.