scope:

This Recommendation addresses the lightning protection of dedicated transformers used to provide electrical power for radio base stations (RBSs). It contains procedures for earthing, bonding and direct lightning protection of the dedicated transformer, including protection methods for the associated power lines, requirements for surge arresters (medium voltage (MV) and low voltage (LV) arresters), and protection procedures for ancillary facilities.

Transformers used for powering an RBS and other components (i.e., shared transformers) are not covered in this Recommendation. The lightning protection of these shared transformers is contained in [b-ITU-T K.111].