EN 55024 CISPR 24

Information technology equipment – Immunity characteristics – Limits and methods of measurement

Published: May 10th, 2022

EN 55024 is equivalent to CISPR 24 and applies to, as the name implies, information technology equipment (ITE). EN 55024 defines the immunity test requirements for information technology equipment in relation to continuous and transient conducted and radiated disturbances. Tests within the standard include Electrostatic Discharges (ESD), Electrical Fast Transients (EFT), Surge, Power Frequency Magnetic Fields, Power interruptions, Radio Frequency Interference (RFI).

EN 55024 establishes requirements that will provide an adequate level of intrinsic immunity so that the equipment will operate as intended in its environment. The test requirements are specified and applied on port by port approach. Ports are defined and described within the standard. The ports include the overall enclosure, DC Power, AC Power, Earth, Signal, and finally Telecommunication ports.

Compliance with this standard gives partial presumption of conformity with the European EMC Directive, 2004/108/EC. Most products will also require assessment to the emissions companion standard EN 55022, for the measurement of the levels of spurious signals generated by the ITE. Additionally, devices powered via the A.C. mains, may require additional testing for power line harmonics and power line flicker.

Other documents referred to by EN 55024 are;

  • EN 55016-1-2:2004
  • EN 55020:2007
  • EN 55022:2010
  • IEC 60050-161
  • EN 60318-1:2009
  • EN 61000-4-2:2009
  • EN 61000-4-3:2006
  • EN 61000-4-4:2012
  • EN 61000-4-5:2006
  • EN 61000-4-6:2009
  • EN 61000-4-8:2010
  • EN 61000-4-11:2004

Information Technology Equipment (ITE), as would be tested for EN 55024, may include:

  • Central processing units (mainframes) and all related features and peripheral units, including processor storage, console devices, channel devices, etc.;• Minicomputers, midrange computers, microcomputers and personal computers and all peripheral units associated with such computers;
  • Special purpose systems including word processing, Magnetic Ink Character Recognition (MICR), Optical Character Recognition (OCR), photo composition, typesetting and electronic bookkeeping;
  • Communication devices used for transmission of data such as: modems, data sets, multiplexors, concentrators, routers, switches, local area networks, private branch exchanges, network control equipment, or digital components of microwave or satellite communications systems; and
  • Input-output (peripheral) units (off-line or on-line) including: terminals, card readers, optical character readers, magnetic tape units, mass storage devices, card punches, printers, computer output to microform converters (COM), video display units, data entry devices, teletypes, teleprinters, plotters, scanners, or any device used as a terminal to a computer and control units for these devices.

Europe has a series of standards prefixed “EN” – European Norm. These are written by the European Committee for Standardization (CEN), the European Committee for Electrotechnical Standardization (CENELEC), and the European Telecommunications Standards Institute (ETSI). The vast majority of ENs that are relevant for the EMC Directive are produced by CENELEC.

Harmonized standards are ENs produced by CEN, CENELEC or ETSI, following a mandate issued by the European Commission, for use with one or more directives. The lists of harmonized standards suitable for each Directive are published from time to time in an official publication called the Official Journal of the European Union, often referred to as “the Official Journal” or “the OJ”. We have links to harmonized standards lists on our European Conformity Assessment page.

The date of publication (dop) for an EN standard is commonly 6 months from the date of availability (dav). The date the standard becomes mandatory is its date of withdrawal (DOW).

All European Standards, including EN 55024, are shaped by consensus among enterprises, public authorities, consumers, and trade unions, through a consultation process organized by independent, recognized standardization bodies at national, European and international level.

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