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The present document defines classes of environmental conditions and their severities to which telecommunication
equipment may be exposed. The severities specified are those which will have a low probability of being exceeded;
generally less than 1 % of the operating time in a year.
The present document applies to equipment mounted for stationary use including periods of erection work, down time,
maintenance and repair at weatherprotected locations defined in clause 5.
The purpose of the present document is to define a class of environmental conditions and their severities to which
equipment may be exposed. Only severe conditions, which may be harmful to the equipment, are included. The
severities specified are those which will have a low probability of being exceeded; generally less than 1 % of the
operating time in a year.
The present document applies to equipment mounted for stationary use including periods of erection work, down time,
maintenance and repair at non-weatherprotected locations defined in clause 5.