本文件定义了电信设备可能暴露的环境条件类别及其严重程度。规定的严重程度是指被超过的可能性很低的严重程度；通常低于1%。本文件适用于主要为海上用途设计的设备。使用条件因容器的大小和设计用途而有很大差异。读者应确保选择的相关类别适合此特定应用。本文件涵盖以下类型的船舶:通过机械方式推进的船舶，包括海上装置；非机械推进的船只，包括帆船和救生筏。定义的类别适用于从游艇到拖网渔船、渡船、破冰船和包括油轮在内的货船的所有尺寸的船舶。

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 %.The present document applies to equipment designed principally for maritime use. Conditions of use vary significantly in relation to the size of the vessel and the function for which it was designed. The reader should ensure that the relevant classes are chosen to suit this particular application.The present document covers the following types of vessel:vessel propelled by mechanical means, including offshore units;vessel not propelled by mechanical means, including sailing boats and life rafts.The classes defined apply to all sizes of vessel from pleasure craft to trawlers, ferry boats, icebreakers and cargo ships including tankers.