ITU-T K.143 PDF

This Recommendation provides guidance on how to ensure the safety of construction and maintenance personnel as well as customers of telecommunication systems in customer buildings and access networks when surge protectors are installed in telecommunication equipment.

The safety of persons on access metallic lines, in-home lines and terminal equipment lies within the scope. The requirements for surge protectives devices/surge protective components (SPDs/SPCs) in multiservice surge protective devices (MSPDs) external to the equipment and SPDs installed on lines in building lie outside the scope of this Recommendation, as does equipment in telecommunication centres and outdoor network equipment operating by remote or local power feeding.