The post AutoQuiz: How Do You Avoid a Ground Loop on Shielded Cable? first appeared on the ISA Interchange blog site.
Today’s automation industry quiz question comes from the ISA Certified Control Systems Technician (CCST) program. Certified Control System Technicians calibrate, document, troubleshoot, and repair/replace instrumentation for systems that measure and control level, temperature, pressure, flow, and other process variables. Click this link for information about the CCST program. This question comes from the Level I study guide, Domain 3, Troubleshooting. Level I represents a professional who has a five-year total of education, training, and/or experience.
A ground loop on shielded cable can be avoided by:
a) attaching a safety ground to the instrument casing
b) grounding the shield at only one end of the circuit
c) attaching a safety ground to the control panel
d) grounding the shield at both ends of the cable
e) none of the above
Source: ISA News