Question

When signaling cables operating at low-voltage DC are installed in close proximity to AC cables, these cables should installed ___ to each other to minimize interference.

Select one:
a. perpendicular
b. parallel

Answer 1

To minimize interference, low-voltage DC signaling cables should be installed perpendicular to AC cables, as this orientation reduces inductive coupling and electromagnetic field interactions.

Step-by-step explanation:

When installing signaling cables that operate at low-voltage DC near AC cables, it is recommended to install them perpendicular to each other. This orientation minimizes electromagnetic interference since the perpendicular arrangement reduces the inductive coupling between the cables. Inductive coupling is more significant when cables run parallel to each other, which could lead to unwanted noise or signals being induced in the low-voltage DC cables by the neighboring AC cables.

Additionally, the electromagnetic fields of perpendicular cables do not interact as closely as those of parallel cables, further reducing potential interference. When cables must cross, it is best to do so at a 90-degree angle rather than having them lie parallel, even for a short distance.