A farmer has to erect an electric fence around the buildings on the farm for security reasons - NSC Agricultural Technology - Question 2 - 2017 - Paper 1
Question 2
A farmer has to erect an electric fence around the buildings on the farm for security reasons.
2.1.1 Name the minimum size of the warning sign for an electric fence... show full transcript
Worked Solution & Example Answer:A farmer has to erect an electric fence around the buildings on the farm for security reasons - NSC Agricultural Technology - Question 2 - 2017 - Paper 1
Step 1
Name the minimum size of the warning sign for an electric fence.
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Answer
The minimum size of the warning sign for an electric fence is 100 mm × 200 mm.
Step 2
Write down the minimum distance between two separate electric fences with different energizers.
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Answer
The minimum distance required between two separate electric fences powered by different energizers is 2 meters.
Step 3
Name the depth to which the earth electrode must penetrate the soil when a high output energizer is used.
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Answer
The earth electrode must penetrate the soil to a depth of 1 meter when using a high-output energizer.
Step 4
How would you know when an isolator, like the one below, is cracked?
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Answer
You can identify a cracked isolator by the presence of sparks and by visual inspection. A cracked isolator may produce sparks which can lead to interference and can be visually inspected for any visible damage.
Step 5
How are electric fence wires protected against rust?
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Answer
Electric fence wires are protected against rust through techniques such as galvanizing or using a copper coating.
Step 6
Make a neat freehand drawing of a standard electric fence with various essential components.
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Answer
The drawing should include the following components:
Battery
Energizer
Poles
Isolator
Wiring (both + and -)
Earth spikes
Ensure that the components are labeled appropriately, and the layout is correct for full marks.
