The arcing current is what relative to the bolted fault current value?

The arcing current is what relative to the bolted fault current value?

• A. Greater than
• B. Equal to
• C. Less than
• D. Not related

Answer: (C)

The arcing current is less than the bolted fault current. A bolted fault represents a near-zero-impedance path, so the current is limited only by the source and line impedances—the maximum fault current the system can deliver. When the fault is arcing, the plasma arc adds resistance and varies with factors like arc length and temperature, which limits the current flow. So, even though arcing faults can produce significant, dangerous currents, the arc path prevents them from reaching the bolted fault level.

The arcing current is less than the bolted fault current. A bolted fault represents a near-zero-impedance path, so the current is limited only by the source and line impedances—the maximum fault current the system can deliver. When the fault is arcing, the plasma arc adds resistance and varies with factors like arc length and temperature, which limits the current flow. So, even though arcing faults can produce significant, dangerous currents, the arc path prevents them from reaching the bolted fault level.