NM CID ES-3 Practice Questions - New Mexico CID ES-3 Low Voltage Special Systems (Under 50 Volts) Examination Exam

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A 60 Hz hum appears only when a mixer, amplifier, and video display share multiple AC ground paths and shield connections. The most appropriate first correction is to:

Lift the equipment grounding conductor on the amplifier power cord Bond the audio shields to a separate isolated ground rod Replace all XLR cables with unshielded speaker wire Identify and break the unintended shield/ground loop, using isolation, a single-point shield bond, or a listed isolation transformer or ground-loop isolator

Correct Answer:

Identify and break the unintended shield/ground loop, using isolation, a single-point shield bond, or a listed isolation transformer or ground-loop isolator

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