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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 suitable for the manufacturing of electrical cables due to its excellent conductivity, allowing efficient transmission of electricity. It is a good conductor of heat, making it easily soldered and crimped. Additionally, copper is lightweight and durable, resistant to corrosion which prolongs the lifespan of electrical installations while maintaining flexibility and malleability for various applications.
Step 2
Discuss THREE safety requirements that must be considered when installing the electric cables and leads of electric fences.
Answer
- Connection Insulation: Connecting leads that run inside buildings must be effectively insulated from the earth strut of the building to prevent electrical shocks.
- Underground Installation: Leads that are buried should be installed in a manner that prevents them from coming into contact with water or animal burrows that may damage the insulation.
- Clear Identification: Safety signs should be posted to indicate where cables are buried, ensuring that workers are aware to avoid accidents.
Step 3
Draw a labelled sketch of a lightning arrestor installed on an electric fence.
Answer
The sketch should include a representation of an electric fence structure with the following components labeled:
- Lightning Arrestor: Positioned near the point of entry for the electric line, designed to divert any excess energy from lightning strikes.
- Clamp: Used to hold the electric fencing wire secure.
- Isolator: To prevent backfeed of current into the system during maintenance.
- Copper Connecting Wires: Conduct the electric currents from the energizer to the fence.
- Ground Rods: For grounding the system and ensuring safety during lightning events.