Field Wiring & Grounding

Practical wiring and grounding guidance for instrumentation technicians, based on real plant installations and failures.

Shielding Best Practices

• Ground shield at one end only
• Avoid floating shields
• Keep signal and power cables separate

Grounding Principles

• Single-point grounding philosophy
• Avoid multiple earth paths
• Bonding is as important as grounding

Common Wiring Failures

• Loose terminals in junction boxes
• Incorrect gland termination
• Improper cable armor grounding

Field Symptoms

• Intermittent signal loss
• Noise only during heavy load operation
• Multiple instruments failing together