#774554

#774554: In what class are zones are located in areas where under normal operation of equipment allocated combustible dusts or fibers which form with air an explosive mixture at a concentration of 65 grams per cubic meter.

In what class are zones are located in areas where under normal operation of equipment allocated combustible dusts or fibers which form with air an explosive mixture at a concentration of 65 grams per cubic meter.
Варианты ответа:
  • 21-th class.
  • 20-th class.
  • 22-th class.

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Тематика: Автоматические системы пожаротушения и связь Пожарная безопасность Техника безопасности и санитария
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