Which of the following geometrical arrangements is allowable for conduits on power and communication poles?

The arrangement of conduits on power and communication poles is critical for ensuring proper function and safety. When conduits are placed 180 degrees apart, it helps to minimize interference between different types of cables, such as power and communication lines. This arrangement allows for adequate separation of electrical components, reducing the risk of electromagnetic interference and thermal issues that could arise if conduits were too closely aligned.

Placing conduits 180 degrees apart also maintains a balanced load on the pole, which is crucial for structural integrity. It ensures that the forces acting on the pole come from opposing sides, which can help reduce the likelihood of structural failure due to uneven weight distribution.

In contrast, arrangements such as stacked vertically or all in line can lead to stacking of electromagnetic fields or heat buildup within conduits, potentially causing performance issues or even damage to the cables inside. Similarly, opposing ends creates an unbalanced structure that does not add any significant benefit compared to the 180-degree arrangement. Thus, positioning conduits 180 degrees apart is the most suitable combination for achieving operational efficiency and safety.