X Equipment
Equipment types that include Class I and Division 1/Zone 1 require adequate air purging via a type X purging system.
If your system has not been properly purged and your environment is not a positive-pressure environment—then the power to this area must be cut off immediately.
Proper use of a type X purging system will reduce your hazards from Division I/Zone 1 to unclassified.
Should you have any planned disruptions to the air feeding of your control room you will need to take the electrical power circuit for the positive-pressure equipment offline.
If you’re questioning the safety of your system during regular or disruptive periods you can use a combustible gas detector to find potentially-dangerous gases and vapors.
An alternative safety measure would be to use an air-purge timer that can help prevent systems being put back online before the necessary air pressurization