This part of lEC 63236 sets the additional requirements for appliance inlets used for information and communication technology (ICT) equipment installed in data centers and telecom central offices and are suitable for both a.c. and d.c.. The accessories according to this part of IEC 63236 are intended to be used by ordinary persons in data centres only where the value of the voltage distribution system is defined as follows: For a d.c. voltage distribution system the values defined in this clause of IEC 63236-1 apply. For an a.c. voltage distribution system the voltage does not exceed 250 V (a.c.) and the rated current according to the standard sheets. Appliance couplers complying with this part of lEC 63236 are suitable for normal use at ambient air temperatures not normally exceeding +60 °C, with a lower limit of the ambient air temperature of -5 °C. This part of IEC 63236 is valid for appliance couplers for protection class I equipment.