1-6
Examining the installation site
Before you install the switch, verify that the installation site meets the installation requirements. The
switch can operate correctly in an A1 or A2 installation site. Availability issues might occur if you
install the switch in an A3, B1, B2, or C installation site.
Table1-5 Installation sites
Category
Definition
Example
A1: indoor controlled
environment
•
Indoor environments where
temperature and humidity are
controlled.
•
Completely enclosed or shielded
indoor environments.
Central equipment rooms, IDC
equipment rooms, mobile cabins
with air conditioners, outdoor air
conditioner cabinets, and heat
exchanger cabinets.
A2: indoor partially
controlled
environment
•
Indoor environments where
temperature and humidity are partially
controlled.
•
Incompletely enclosed or shielded
places.
•
Places far from pollution sources.
Simple equipment rooms, ordinary
houses, garages, corridors, and
direct ventilation cabinets far from
pollution sources, houses without
direct exposure to sunlight or rain,
railway station platforms, and
stadiums.
A3: indoor
uncontrolled
environment
•
Indoor environments where
temperature and humidity are
uncontrolled.
•
Incompletely enclosed or shielded
places.
•
Places near pollution sources.
Simple equipment rooms, ordinary
houses, garages, corridors, and
direct ventilation cabinets near
pollution sources, houses without
direct exposure to sunlight or rain,
railway station platforms, stadiums,
uncleaned rooms after decoration,
and rooms under decoration.
B1: outdoor general
environment
•
Unshielded places where the
temperature and humidity are not
controlled.
•
Places far from pollution sources.
Completely exposed outdoor places
far from pollution sources.
B2: harsh
environment
•
Unshielded places where the
temperature and humidity are not
controlled.
•
Sea environments or outdoor land
environments near pollution sources.
Islands, ships, and completely
exposed outdoor places near
pollution sources.
C: special
environments
Special application environments
Buried, underwater, or undersea
environments and manholes.
Table1-6 Pollution sources
Category
Radius range
Saline water areas such as oceans and saline lakes
≤ 3.7 km (2.30 miles)
Serious pollution sources such as metallurgic plants, coal mines, and
heat and power plants
≤ 3 km (1.86 miles)
Medium pollution sources such as chemical factories, rubber plants,
and electroplating factories
≤ 2 km (1.24 miles)
Light pollution sources, such as food factories, tanneries, and
heating boilers
≤ 1 km (0.62 miles)
