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2.1.1 Explain why copper is suitable for the manufacturing of electrical cables - NSC Agricultural Technology - Question 2 - 2020 - Paper 1
Question 2
2.1.1 Explain why copper is suitable for the manufacturing of electrical cables. Copper is widely used in the manufacturing of electrical cables due to its excellen... show full transcript
Worked Solution & Example Answer:2.1.1 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 widely used in the manufacturing of electrical cables due to its excellent electrical conductivity. It conducts electricity effectively, making it an ideal choice for applications requiring minimal resistance. Furthermore, copper is a good conductor of heat, which allows it to efficiently handle high current loads without overheating.
Additionally, copper is lightweight and easily joined through methods like soldering and crimping, promoting versatility in cable design. Its durability and resistance to corrosion ensure a long lifespan, while its malleability allows for easy shaping and insulation integration, essential for safe and effective electrical installations.
Step 2
Discuss THREE safety requirements that must be considered when installing the electric cables and leads of electric fences.
Answer
When installing electric cables and leads for electric fences, safety is paramount. Here are three essential safety requirements:
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Insulation: Connecting leads that are run inside buildings must be effectively insulated from the earth's structural parts to prevent electrical shock.
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Depth and Protection: Underground cables must be buried deep enough to avoid physical damage and should be installed in a conduit to minimize the risk of electric shock due to accidental contact with the cables.
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Identifying Cables: Care must be taken to indicate where cables are buried using proper signage to prevent accidental digging or interaction that may lead to electrical hazards.
Step 3
Draw a labelled sketch of a lightning arrestor installed on an electric fence.
Answer
When installing a lightning arrestor, it should be placed on the electric fence line, usually connected to the ground rods for effective grounding. The diagram should include the following:
- Clamp: To hold the lightning arrestor in place.
- Isolator: To separate the energiser from the lightning arrestor.
- Electric fence line: The wire that carries the electric current.
- Ground rods: To safely direct the lightning's energy into the ground.