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2.1 Explain why copper is suitable for the manufacturing of electrical cables - NSC Agricultural Technology - Question 2 - 2020 - Paper 1
Question 2
2.1 Explain why copper is suitable for the manufacturing of electrical cables. 2.1.2 Discuss THREE safety requirements that must be considered when installing the e... show full transcript
Worked Solution & Example Answer:2.1 Explain why copper is suitable for the manufacturing of electrical cables - NSC Agricultural Technology - Question 2 - 2020 - Paper 1
Step 1
Explain why copper is suitable for the manufacturing of electrical cables.
Answer
Copper is an excellent conductor of electricity, making it a primary choice for electrical cables. It has a high thermal conductivity, which facilitates efficient heat dissipation during operation. Additionally, copper is lightweight and offers durability, allowing it to withstand various environmental conditions without significant degradation. Its malleability enables easy joining through techniques such as soldering and crimping, providing reliable connections.
Step 2
Discuss THREE safety requirements that must be considered when installing the electric cables and leads of electric fences.
Answer
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Effective Insulation: Leads that are run inside buildings must be insulated from the earth's structure effectively to prevent electrical shock.
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Proper Burial: Underground leads must be buried at a specified depth to avoid damage caused by external forces or animal activity.
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Clear Marking: Markers should indicate where cables are buried to prevent accidental digging that could lead to power outages or injuries.
Step 3
Draw a labelled sketch of a lightning arrestor installed on an electric fence.
Answer
The sketch should show the electric fence line connected to a lightning arrestor, which features:
- Clamp: The point where the electric line connects.
- Isolator: A component that separates the arrestor from the charging circuit.
- Ground rods: These should be illustrated below the arrestor, indicating where the system grounds the energy. Ensure the arrangement reflects a clear design with labels for each component.