How would you identify a short to ground in a bus electrical circuit?

• A. Symptoms include blown fuses or breakers, excessive current, heat, and low resistance to ground; use a resistance measurement and isolate sections to locate the fault.
• B. Short to ground results in high resistance, no heat.
• C. Short to ground can be located by measuring only voltage.
• D. Symptoms include blown fuses or breakers, excessive current, heat, and low resistance to ground; use a resistance measurement and isolate sections to locate the fault.

Answer: (D)

A short to ground creates a low-resistance path to ground, causing excessive current that leads to heat and typically blows fuses or opens breakers. Because of that low resistance to ground, you can confirm a fault by measuring resistance and then isolating sections of the circuit to zero in on where the path to ground exists. Measuring voltage alone won’t reliably locate the fault since voltage can be present on conductors without revealing the actual current path or pinpointing the exact point of the fault. So the best method combines resistance measurement with systematic isolation to locate the fault. High resistance to ground or relying only on voltage measurements would not indicate a short to ground. Always ensure power is safely de-energized and use proper test gear.