During surface faults, porcelain fragmentation is observed on the surface of a ______ or insulator.

During surface faults, porcelain fragmentation is observed on the surface of a ______ or insulator.

• A. Bushing
• B. Conductor
• C. Transformer
• D. Panel

Answer: (A)

During a surface fault, the current travels along the surface of the insulation rather than through the air, causing arcing and mechanical stress that chips and fragments the porcelain. A bushing is a porcelain-insulated component through which a conductor passes, so its outer porcelain surface is where fragmentation is most readily observed. While conductors, transformers, and panels may be involved in faults, the visible porcelain fragmentation described here is characteristic of the insulating surface—specifically a bushing or insulator.

During a surface fault, the current travels along the surface of the insulation rather than through the air, causing arcing and mechanical stress that chips and fragments the porcelain. A bushing is a porcelain-insulated component through which a conductor passes, so its outer porcelain surface is where fragmentation is most readily observed. While conductors, transformers, and panels may be involved in faults, the visible porcelain fragmentation described here is characteristic of the insulating surface—specifically a bushing or insulator.