One way to avoid EMI problems is to ________.

One way to avoid EMI problems is to ________.

• A. run in plastic conduits
• B. wrap low-voltage cables in insulation
• C. use grounded metal pathways
• D. place unshielded cables near power

Answer: (C)

Reducing EMI comes from shielding the cables and providing a solid grounding path. Grounded metal pathways, such as metal conduit or metal cable trays that are bonded to earth, surround the wires and give EMI currents a low-impedance path to ground. This shielding and grounding keep interference from coupling into the conductors and also limit the radiation that the cables emit, helping maintain signal integrity. Plastic conduits don’t provide meaningful EMI shielding, so simply routing through them doesn’t block interference. Wrapping low-voltage cables in insulation also doesn’t shield against electromagnetic fields—it’s mainly for moisture and physical protection. Placing unshielded cables near power sources increases exposure to magnetic and electric fields, making EMI worse.

Reducing EMI comes from shielding the cables and providing a solid grounding path. Grounded metal pathways, such as metal conduit or metal cable trays that are bonded to earth, surround the wires and give EMI currents a low-impedance path to ground. This shielding and grounding keep interference from coupling into the conductors and also limit the radiation that the cables emit, helping maintain signal integrity.

Plastic conduits don’t provide meaningful EMI shielding, so simply routing through them doesn’t block interference. Wrapping low-voltage cables in insulation also doesn’t shield against electromagnetic fields—it’s mainly for moisture and physical protection. Placing unshielded cables near power sources increases exposure to magnetic and electric fields, making EMI worse.