ISO 22237 relates four levels of protection classes.
The protection classes start concentrically from the
internal number going out being four to one.
The outer edge of the protection class leading to the center,
which would be the data center, is the one that's going to have the greatest
level of protection, is the most critical and highly valued.
So, the one that's the farthest out will be considered general office space.
Go into the next protection level and you have physically walked closer to
the center of the building, and you've arrived at Class 2.
Here, the area is accessible to all authorized
personnel, employees, and visitors.
Examples could be a personnel entrance to a data center,
a docking bay, or a storage space. At Class 3, we've arrived at a highly
restricted space. Specified employees and visitors who have some type of
specialized pass with access to Class 2 have to be accompanied by personnel
authorized to access protection Class 3.
Then, as we get to the most concentric middle,
the Class 4 area is restricted to specified employees who
have an identified need to access the space here. Examples
here could be control room space, data center office space,
the main distribution space, and the computer room space.
Let's next talk about design resilience from a fire suppression
perspective that's also about protection classes.