Appendix A: Performance Specification

Table A- 15: Certifications and compliances (cont.)

CATEGORY

STANDARDS OR DESCRIPTION

 

 

InstallationTerminals on this product may have different installation
(Overvoltage)

(overvoltage) category designations. The installation categories

Categoryare:

 

 

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.

 

 

Pollution DegreeA 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.

 

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.

 

 

 

A-14

1740A/1750A Series Waveform/Vector Monitor User Manual