IEC 60870-2-2:1996

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Climatic conditions
3.1 General
3.2 Types of location
3.2.1 Air-conditioned locations (class A)
3.2.2 Heated or/and cooled enclosed locations (class B)
3.2.3 Sheltered locations (class C)
3.2.4 Outdoor locations (class D)
3.3 Classes of climatic parameters
3.3.1 Temperature, humidity, solar radiation, condensation, wind,
        rain, snow, frost, ice
3.3.2 Air pressure
4 Mechanical influences
4.1 General
4.2 Type of locations and transportation conditions
4.2.1 Light installation and storage conditions (class Am)
4.2.2 Normal installation and storage conditions, light transport
        (class Bm)
4.2.3 Severe installation and storage conditions, normal transport
        (class Cm)
4.2.4 Critical installation conditions, severe transport (class
4.3 Classes of mechanical parameters
4.4 Seismic effects (earthquakes)
4.4.1 Quantification of earthquakes
5 Other influences
6 Climatic and mechanical tests
Annexes
A Interdependence of air temperature, relative humidity and
        and absolute humidity
B Phenomena of earthquakes related to the scale of Richter
        and Mercalli

Applies to telecontrol equipment and systems with coded bit serialdata transmission for monitoring and control of geographically widespread processes. Specifies classes for environmental conditionsunder which the various components of the systems have to operate.