ITU-T K.89 PDF

This Recommendation deals with the risk management of lightning protection for occupants of a structure related to a telecommunication service using metallic conductor cables. Where the telecommunication service is provided by CDMA WLL, or similar, refer to [ITU-T K.71].

The risk assessment is limited to injury of occupants where the installation of the telecommunication service increases the risk of injury due to lightning. This Recommendation provides a procedure for the evaluation of such a risk. Once an upper tolerable limit for the risk has been selected, this procedure allows the selection of appropriate protection measures to be adopted to reduce the risk to a level at or below the tolerable limit.

This Recommendation is mainly aimed at mitigating the risk associated with a telecommunication service in a private, public or commercial structure. The risks in telecommunication structures are generally mitigated by network operator practices and policies. However, this Recommendation can be used for telecommunication structures if agreed by the telecommunication operator.

This Recommendation shall be used together with [ITU-T K.72], which provides the risk assessment against lightning flashes to the telecommunication line. Recommendation [ITU-T K.85] provides the risk assessment against equipment damage in customer premises.

The protection need for line equipment (such as multiplexers, power amplifiers, optical network units) and line termination equipment is not considered in this Recommendation and it should be evaluated using the risk assessment applied to the structure where the equipment is located (i.e., exchange, customer's building, or remote electronic site).