New York State Master Electrician Practice Exam

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When are plug fuses required to be in a hexagon configuration?

  1. For any voltage rating

  2. For ratings above 15 amperes

  3. For ratings of 15 amperes or lower

  4. For any amperage rating

The correct answer is: For ratings of 15 amperes or lower

Plug fuses must be in a hexagon configuration specifically for ratings of 15 amperes or lower to ensure safety and compatibility with the devices they protect. This design is intended to provide a standardized way of connecting and handling lower amperage circuits, reducing the risk of misuse or accidental overload. Fuses designed for higher amperage ratings do not require this configuration, as the design standards and applications differ significantly. Thus, while plug fuses do exist in various configurations, the hexagon shape is specifically mandated for lower-rated fuses to enhance safety during installation and operation.