This standard defines influences from the sorroundings on fixed electrical installations in open air, in covered areas, tunnels and within cubicles placed in above areas. Such influences include altitude, temperature & humidity, air movement, rain, snow, hail, ice, sand, solar radiation, lightning, pollution and vibrations. In this respect it gives general guidance in order to allow the fairness of bid assessments and the process of railway projects. The environmental conditions are considered for normal operation. More severe conditions may be specified for the equipment to withstand, when not operating, without suffering damage.Microclimates surrounding components may need special requirements which are covered by product standards. In case of environmental conditions not covered by the standard the data to be adopted for a specific project shall be clearly stipulated when preparing a specification. This standard is not intended to apply to cranes, installations in underground mines, suspended cable cars and funicular railways. Biological influences, EMC, electromagnetic interference and nuclear radiation are excluded. Signalling and telecommunications systems are not considered in this standard. Equipment in tunnels will include the running tunnel and the platform together with fixed equipment essential to operate the railway. Not included will be escalators, lifts, fire protection, lighting in tunnels and on platforms, ticket machines, toilets and ventilation systems.
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