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AWG710 Service Manual
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Table 1-23: Installation category and pollution degree descriptions
Characteristics Description
Installation category Terminals on this product may have different installation category designations. The
installation categories are:
Category Descriptions
CAT III DistributionĆlevel mains (usually permanently connected).
Equipment at this level is typically in a fixed industrial
location.
CAT II LocalĆlevel mains (wall sockets). Equipment at this level
includes appliances, portable tools, and similar products.
Equipment is usually cordĆconnected.
CAT I Secondary (signal level) or battery operated circuits of
electronic equipment
Pollution degree
A measure of the contaminants that can occur in the environment around and within a
product. Typically, the internal environment inside a product is considered to be the same
as the external. Products should be used only in the environment for which they are rated.
Category Descriptions
Pollution Degree 1 No pollution or only dry, nonconductive pollution occurs.
Products in this category are generally encapsulated,
hermetically sealed, or located in cleanrooms.
Pollution Degree 2 Normally only dry, nonconductive pollution occurs.
Occasionally a temporary conductivity that is caused by
condensation must be expected. This location is a typical
office/home environment. Temporary condensation occurs
only when the product is out of service.
Pollution Degree 3 Conductive pollution, or dry, nonconductive pollution that
becomes conductive due to condensation. These are
sheltered locations where neither temperature nor humidity is
controlled. The area is protected from direct sunshine, rain,
or direct wind.
Pollution Degree 4 Pollution that generates persistent conductivity through
conductive dust, rain, or snow. Typical outdoor locations.