Cross power cables at 90-degree angles when possible.

Cross power cables at 90-degree angles when possible.

• A. 45-degree angles
• B. Parallel
• C. Overlapping
• D. 90-degree angles

Answer: (D)

Crossing at right angles minimizes interference and mutual coupling between power cables and other lines. When cables cross perpendicularly, the length of the interaction between their fields is very short, which greatly reduces the chance that one cable will induce unwanted voltages or noise into the other. If you cross at a shallow angle like 45 degrees, or run them parallel for a distance, the cables influence each other along a longer path, increasing crosstalk and potential interference. Overlapping isn’t practical or safe, as it can cause physical damage and safety issues. So, crossing at 90 degrees whenever possible is the best practice.

Crossing at right angles minimizes interference and mutual coupling between power cables and other lines. When cables cross perpendicularly, the length of the interaction between their fields is very short, which greatly reduces the chance that one cable will induce unwanted voltages or noise into the other. If you cross at a shallow angle like 45 degrees, or run them parallel for a distance, the cables influence each other along a longer path, increasing crosstalk and potential interference. Overlapping isn’t practical or safe, as it can cause physical damage and safety issues. So, crossing at 90 degrees whenever possible is the best practice.