Recommendation ITU-T L.1204 describes the extended architecture of power feeding systems of up to 400 volts DC (VDC) for information and communication technology (ICT) equipment in telecommunication centres, data centres and customer premises. It describes aspects such as configuration, redundancy, power distribution and monitoring, in order to construct safe, reliable and manageable power feeding systems. This Recommendation can be used also as an architecture reference model for future Recommendations e.g. on the performance of DC power feeding systems. This Recommendation describes extended power feeding architectures using up to 400 VDC e.g. hybrid redundant DC and AC power feeding based on Recommendation ITU-T L.1201.