ITU-T K.148 PDF

This Recommendation provides application guidance on multiservice surge protective devices (MSPDs) and explains how MSPDs provide local overvoltage protection for the services used by an equipment or equipment cluster. The requirements of the individual service surge protective devices (SPDs) are outlined, together with possible interactions on the MSPD protected side. This Recommendation also explains how the MSPD interacts with the surges on the services and the consequences of these surges when the local protective earthing (PE) connection is high impedance or is missing.