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D2PB Hazardous Area Circuit Breaker Panelboards

D2PB circuit breaker panelboards are designed specifically for use indoors or outdoors in Class I, Division 2 hazardous areas where flammable vapors or gases may be present due to accident or abnormal locations.  Common applications include petroleum refineries, chemical and petrochemical plants and other process industry facilities.

D2PB Hazardous Area Circuit Breaker Panelboards

Certifications and compliances


  • Class I, Division 2, Groups C, D
  • UL standards: UL67, UL877
  • NEMA 3, 7CD (Division 2), 12

Design features

  • Enclosures are of external flange design – interior is completely accessible when cover is removed
  • Provided with concealed mounting – made possible by having four clearance holes for lag screws or mounting bolts in the back of the enclosure, one in each corner
  • The interior sub-assembly, consisting of a mounting plate, main terminal blocks and circuit breakers, is removable as a complete unit
  • Ample gutter space is provided for ease of field wiring
  • Circuit breakers are contained in compact, individual factory sealed enclosures suitable for Class I, Division 2, Groups C, D hazardous areas
  • Gasketed main cover, which excludes dirt and moisture, is attached to the body with hex head bolts and is removed only when installing the panelboard or making wiring changes; in the center of the main cover is a gasketed hinged door, which provides access only to the circuit breaker operating handles, and is held closed by two quick release catches; the door can be locked by as many as three padlocks to prevent unauthorized operation
  • Tapped conduit openings are provided for main conduit and branch circuits; standard openings can be reduced or plugged to meet most installation requirements
  • Circuit breakers are arranged in two vertical rows and have the circuit numbers marked on the handles; the left row is numbered 1, 3, 5, 7, etc. and the right row 2, 4, 6, 8, etc.; identifying information may be typed on the circuit directory card attached to the inside of the hinged door

Standard materials

  • Bodies, covers and hinged doors – copper-free aluminum
  • Breaker operating handles – type 6/6 nylon
  • Interior parts – sheet steel
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