Discussion
The desired minimum depth from ground level to the top of the underground cable at road crossings, is ______.
Answer: A
Underground cables are buried to protect them from damage, and where they cross a road they have to be deeper because of the weight and the vibration of the traffic. The key gives the desired minimum depth from the ground level to the top of the cable at road crossings as 1 metre, option (A). The greater depths of 2, 3 and 4 metres are more than needed and would add to the cost of digging without improving the protection.
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