Pintek PA-655 Instruction Manual page 18

Table 6: Certifications and compliances (cont.)
Installation
(Overvoltage)
Category
Pollution Degree
Terminals on this product may have different
installation (overvoltage) category designations.
The installation categories are:
CAT III
Distribution-level mains (usually permanently
connected).
Equipment at this level is typically in a fixed
industrial location.
CAT II
Local-level mains (wall sockets). Equipment at this
level includes appliances, portable tools, and
similar products. Equipment is usually
cord-connected.
CAT I
Secondary (signal level) or battery operated circuits
of electronic equipment.
A measure of the contaminates that could 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.
Pollution Degree 1
No pollution or only dry, nonconductive pollution
occurs. Products in this category are generally
encapsulated, hermetically sealed, or located in
clean rooms.
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.
18
www.tmatlantic.com