The present document contains requirements for: - the output of the power supply feeding interface A1; - the input of the ICT equipment connected to interface A1. The voltage at interface A1 defined in the present document is single phase and three phase AC. The following voltage range categories are covered: - Narrow single phase A1n-1p and narrow three phase A1n-3p AC voltage range defined to comply with nominal European AC voltages [i.2]. - Wide single phase A1w-1p and wide three phase A1w-3p AC voltage range for worldwide nominal AC voltages. The present document aims at providing compatibility between the power supply equipment and both the ICT equipment, and the different load units connected to the same interface A1 (e.g. control/monitoring, cooling system, etc.).