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An application in a hazardous area calls for

  • A.the highest available switching frequency
  • B.an open machine with the best possible ventilation
  • C.a machine and enclosure certified for that area
  • D.a dc machine with a commutator and brushes

Answer: C

Certification governs what may be installed, and a cage machine in a flameproof or increased-safety enclosure is the usual choice. Brushgear is exactly what such an area cannot tolerate, and enclosure reduces the rating a given frame can deliver.

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