If low voltage (LV) and extra low voltage (ELV) cables are installed in the same containment, what can occur?

• A. The LV cables disrupt the ELV cables, rendering them useless.
• B. The ELV cables enhance LV performance.
• C. There is no interaction between the two.
• D. The containment can safely house both without any effect.

Answer: (C)

Cables carrying different voltage levels can share the same containment, and in normal operation they do not interact with each other. Extra-low-voltage circuits carry very little current and stay electrically isolated from low-voltage power cables, while the containment, insulation, and proper routing minimize any coupling. As a result, the magnetic fields and electrical noise from LV power lines do not significantly affect ELV circuits, and ELV signals are not boosted or disrupted by the presence of LV cables. Only fault conditions or poor design/overcrowding could introduce interference. So, under standard installation practice, there’s no meaningful interaction between the two.