This part of IEC62735, which is a Technical Specification, applies to plugs and fixed socket-outlets for class I equipment with two active contacts plus an earthing contact, a rated power of 2,6kW and a rated voltage range from 294V to 400V d.c. They are intended to power d.c. information and communication technology equipment only, products according to IEC60950.

The accessories according to this part of IEC62735 are intended to be used by ordinary persons in data centres only where the value of the d.c. voltage distribution system is defined as follows:

• 380V with a tolerance of±20V for installations with no backup battery or with a voltage regulation system;

• 380V with a voltage range of 294V to 400V for installations with a backup battery where voltage regulation is not guaranteed;

• the voltage value between each live conductor and earth does not exceed 200V d.c. during normal operation;

• there are two abnormal voltage ranges (duration below 10min):

  • 260V up to 294V, and

  • above 400V to 410V.

The maximum current of the plug and the socket-outlet is

• 6,5A when the voltage between live contacts is 400V d.c.,

• 8,8A when the voltage between live contacts is 294V d.c.

and can rise up to 10A when the voltage between live contacts decreases to 260V d.c. for 10min maximum.

The voltage between live conductors can fall down to 260V d.c. when the voltage discharge value of the battery reaches the disconnecting level. The consequence is that the current increases accordingly.

The accessories according to this part of IEC62735 do not require maintenance.

Plugs and socket-outlets covered by this part of IEC62735 are intended for use in circuits where

• basic protection,

• an overcurrent protection (of 8,8A or less for each socket-outlet or multiple socket-outlet),

• the fault protection (indirect contact protection), and

• additional protection

are already assured.

This part of IEC62735 does not cover requirements for flush mounting boxes: however, it covers only those requirements for surface-type mounting boxes which are necessary for the tests on the socket-outlet.

NOTE1 General requirements for mounting boxes are given in IEC60670.

This part of IEC62735 also applies to

• plugs incorporated in cord sets,

• plugs and socket-outlets incorporated in cord extension sets for data centres to be fixed to a wall or a rack,

• the cord extension set and multiple socket-outlets for data centres intended to be fixed to a wall or a rack, and

• socket-outlets which are a component of an assembly,

unless otherwise stated in the standard for the relevant assembly.

This part of IEC62735 does not apply to

• single or multiple portable socket-outlets not fixed to a wall or a rack;

• plugs, socket-outlets and couplers for industrial purposes;

• plugs, socket-outlets and vehicle couplers for electric vehicles according to the IEC61851 and IEC62196 series;

• plugs and socket-outlets for household;

• appliance couplers;

• plugs, fixed and portable socket-outlets for extra-low voltage (ELV);

  NOTE2 ELV values are specified in IEC60364-4-41.

• fixed socket-outlets combined with fuses, automatic switches, etc.

Socket-outlets with pilot lights are allowed provided that pilot lights comply with the relevant standard, if any.

Plugs and socket-outlets complying with this part of IEC62735 are only suitable for use at ambient temperatures not normally exceeding+40°C, but their average over a period of 24h does not exceed+35°C, with a lower limit of the ambient air temperature of−5°C.

Socket-outlets complying with this part of IEC62735 are only suitable for incorporation or mounting in equipment in such a way and in such a place that it is unlikely that the surrounding temperature exceeds 35°C.