TP48200A-DX12A1 Telecom Power
User Manual
Copyright © Huawei Technologies Co., Ltd.
Class A environments refer to indoor environments where temperature and humidity are controllable,
including rooms where human beings live.
Class B environments refer to indoor environments in which the ambient temperature and humidity
are not controlled and outdoor environments (with simple shielding measures) where the humidity
can reach 100%.
Class C environments refer to sea environments or outdoor land environments (with simple
shielding measures) near pollution sources. If a site is near a pollution source, it is at most 3.7 km
away from salt water, such as the sea and salt lakes, 3 km away from heavy pollution sources, such
as smelteries, coal mines, and thermal power plants, 2 km away from medium pollution sources,
such as chemical, rubber, and galvanization industries, or 1 km away from light pollution sources,
such as packing houses, tanneries, and boiler rooms.
Class D environments refer to areas about 500 m away from the seashore. Class D environments are
special Class C environments.
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