Improper grounding can cause which outcome?

• A. Improvement of signal clarity
• B. Equipment damage
• C. Decreased sensor response time
• D. Lower installation cost

Answer: (B)

Proper grounding provides a safe reference and a clear fault current path. When grounding is improper, voltage differences can develop between equipment grounds, allowing stray or fault currents to flow through devices that aren’t designed to handle them. Those currents can cause overheating, insulation breakdown, and component damage, especially in electrical instrumentation loops like the 4–20 mA/HART setup where multiple devices share a common reference. Ground faults and EMI also introduce transients that stress sensors, transmitters, power supplies, and controllers, increasing the risk of hardware failure. This is why improper grounding is a safety and reliability concern that can lead to equipment damage. It wouldn’t improve signal clarity—noise and interference typically worsen the measurement—and it wouldn’t reduce response time or installation costs; any potential short-term savings are far outweighed by the potential for damage and downtime.