Question

AAAC conductor supported in horizontal construction between two three member wooden pole structures in a level ground gives a minimum clearance of 1 0 � of its blue phase conductor is a sag of 4 � fro a span of 3 0 0 � . If the structure is to be used over a hill of 1 in 1 5 ; Find the minimum ground clearance obtained for the same span same conductor and weather conditions

Answer 1

The minimum ground clearance obtained for the same span, same conductor, and weather conditions over the hill is 25 units.

Step-by-step explanation:

The minimum ground clearance obtained for the same span, same conductor, and weather conditions can be found by considering the effect of the hill. Since the hill has a slope of 1 in 15, it means that for every 15 units of horizontal distance, there is a change of 1 unit in the vertical distance.

To find the minimum ground clearance, we need to calculate the vertical distance the conductor sags from the span of 300 units and then add the change in vertical distance due to the hill.

Let's start by finding the sag of the conductor from the span of 300 units. Given that the sag of the conductor is 4 units from a span of 300 units, we can use the sag formula:

Sag = (L^2 * S) / (8 * H), where L is the span, S is the sag, and H is the clearance above the ground.

Plugging in the given values, we have:

4 = (300^2 * 10) / (8 * H)

Solving for H, we find that the clearance above the ground is 5 units.

Next, we need to consider the change in vertical distance due to the hill. Since the hill has a slope of 1 in 15, for every 15 units of horizontal distance, there is a change of 1 unit in the vertical distance. The span of 300 units divided by 15 gives us 20 units of change in vertical distance.

Therefore, the minimum ground clearance obtained for the same span, same conductor, and weather conditions over the hill is 5 + 20 = 25 units.