What two instruments may be used to check the capability of the equipment ground on a branch circuit within the building?

What two instruments may be used to check the capability of the equipment ground on a branch circuit within the building?

• A. Megger and Ground Loop Impedance Tester
• B. Voltmeter and Ammeter
• C. Oscilloscope and Spectrum Analyzer
• D. Receptacle Tester and GFCI Tester

Answer: (A)

Testing equipment grounding on a branch circuit focuses on whether the grounding path back to the source is solid and capable of carrying fault current safely. A megger (megohmmeter) measures insulation resistance, helping verify there are no hidden leakage paths or insulation problems that could affect the ground system and its bonding. A ground loop impedance tester directly measures the impedance of the fault path from the equipment to the source, showing whether the grounding conductor and connections provide a low enough impedance for protective devices to trip quickly in a fault. Together, these two tools give a direct assessment of the grounding capability. The other instruments don’t provide this targeted information: a voltmeter and ammeter track electrical quantities but not the integrity of the grounding path; an oscilloscope and spectrum analyzer analyze signals; and a receptacle tester with a GFCI tester can reveal wiring errors or GFCI function but not the actual grounding path impedance or insulation integrity.

Testing equipment grounding on a branch circuit focuses on whether the grounding path back to the source is solid and capable of carrying fault current safely. A megger (megohmmeter) measures insulation resistance, helping verify there are no hidden leakage paths or insulation problems that could affect the ground system and its bonding. A ground loop impedance tester directly measures the impedance of the fault path from the equipment to the source, showing whether the grounding conductor and connections provide a low enough impedance for protective devices to trip quickly in a fault. Together, these two tools give a direct assessment of the grounding capability. The other instruments don’t provide this targeted information: a voltmeter and ammeter track electrical quantities but not the integrity of the grounding path; an oscilloscope and spectrum analyzer analyze signals; and a receptacle tester with a GFCI tester can reveal wiring errors or GFCI function but not the actual grounding path impedance or insulation integrity.