The class and group approval required by the NEC for teh visible components of a dispenser electrical system which must be marked on all visible components with the exception of the wiring condui

The class and group approval required by the NEC for teh visible components of a dispenser electrical system which must be marked on all visible components with the exception of the wiring condui

• A. Class 2 Group G
• B. Class 3 Group B
• C. Class 1 Group D
• D. Class 1 Group C

Answer: (C)

Hazardous-location classifications are used to ensure electrical equipment is suitable for areas with flammable vapors. For a fueling dispenser, you’re dealing with hydrocarbon vapors, so the equipment must be rated for Class I locations. Within Class I, the group that fits most dispensing environments is Group D, which covers common hydrocarbon vapors like gasoline and other fuels found at service stations. That’s why visible components of the dispenser’s electrical system should be marked Class I, Group D to show they’re approved for those vapors. Wiring conduits are typically exempt from this marking because they’re not active equipment in the same way as the enclosures and devices. The other options don’t fit because they pertain to different hazards (dust or fibers) or to gases that aren’t the typical fuels encountered at a gasoline/diesel dispenser.

Hazardous-location classifications are used to ensure electrical equipment is suitable for areas with flammable vapors. For a fueling dispenser, you’re dealing with hydrocarbon vapors, so the equipment must be rated for Class I locations. Within Class I, the group that fits most dispensing environments is Group D, which covers common hydrocarbon vapors like gasoline and other fuels found at service stations. That’s why visible components of the dispenser’s electrical system should be marked Class I, Group D to show they’re approved for those vapors. Wiring conduits are typically exempt from this marking because they’re not active equipment in the same way as the enclosures and devices. The other options don’t fit because they pertain to different hazards (dust or fibers) or to gases that aren’t the typical fuels encountered at a gasoline/diesel dispenser.