Cabinet Selection Guidelines
Equipment that is intended for installation in controlled environmental space has average yearly levels of
contamination. Ventilated cabinets or racks can be used if pollutant levels are maintained within allowable
limits.
Equipment intended for installation in outside plant (OSP) areas must have sealed cabinets with heat exchanger
that meet the NEMA -4 or IP66 protection and low average yearly levels of concentration of contaminants
inside the cabinet.
Ventilated cabinets and racks are not recommended for OSP applications.
Note
Table 1: Cabinet Type for Indoor and Outdoor Installation
Suitable for Outdoor Installation?
Suitable for Indoor Installation?
Cabinet Type
No
Yes
Open rack with no front and rear
doors
No
Yes
Ventilated cabinets with normal air
filter at intake and fans
Yes
Yes
Sealed cabinets with heat
exchanger that meet NEMA -4 or
IP66 protection
Yes
Yes
Sealed cabinets with
air-conditioners that meet NEMA
-4 or IP66 protection
Allowable limits for Environmental Pollutants
Concentration of pollutant levels in outdoor and indoor environment must be less than pollutant levels
mentioned in Table 2.3 and Table 2.4 of
NEBS GR-63-CORE Issue 5 Dec 2017
, respectively. High
concentrations of pollutants have a negative impact on the equipment life time.
Allowable Temperature and Humidity
Maximum allowable temperature and humidity levels must be within the values that are mentioned in the data
sheets. Do not install in places where condensation may occur, or where equipment is exposed to high humidity
for long time, such as near the sea, rivers, and large water bodies.
Installations in Highly-corrosive Environment
Installation in highly corrosive areas is not recommend. Examples of highly corrosive area are seashore, less
than 10 meters from high traffics roadway, and areas having high industrial pollutants.
Periodic Measurement of Environmental Pollutants
We recommend that you check concentration of pollutants periodically. Necessary protection should be
provided to ensure the equipment is not exposed to high concentration level of pollutants.
Prepare for Installation
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Prepare for Installation
Cabinet Selection Guidelines
