BS EN 60870-2-2:1997

INTRODUCTION
1 Scope and object
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 location
                  (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 Dm)
    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 absolute humidity
B Phenomena of earthquakes related to the scales
    of Richter and Mercalli
ZA (normative) Normative references to international
    publications with their corresponding European
    publications

Applicable to telecontrol equipment and systems having coded bit serial data transmission for monitoring and control of geographica lly widespread processes. To be used also as reference for teleprotection equipment and systems and for a power line carrier.