International Standards and Conformity Assessment for all electrical, electronic and related technologies



Reference HD 549 S1:1989
Title Conference systems - Electrical and audio requirements
Project Number 2564
Abstract/Scope Applies to conference systems and to parts of which they are composed or which are used as auxiliaries to such systems (headphones, microphones, amplification equipment). Describes the different types of conference systems with both wired and wireless systems, and specifies the basic electrical requirements of audio equipment for conference systems. Prescribes the minimum requirements for conference systems in order to ensure interchangeability and optimum performance under conditions of normal operation.


Current Stage code 6060
Current Stage code date 1989-12-13
Current Stage code deadline 1990-09-01
Deadline date for vote  


Directive(s) LVD (2006/95/EC)
Order Voucher  


IEC Technical Body IEC/TC 100
Reference Document IEC 60914:1988 (EQV)
Keywords Conference system; Electrical requirement; Audio requirement
Note IEC withdrawn * SR 100 invited to advise on possible withdrawal vote for HD
Special National Condition(s)  


Categories - Aspects
Product Life Cycle


Deadline Date
6060 1989-12-13 1990-09-01 export to doc file  EN
5099 1989-11-01 1989-12-01  
5020 1989-04-05 1989-07-15  
1599 1989-03-07 1989-07-07  
1520 1988-10-10 1989-01-15  

Implementation Dates

date of Ratification (DOR) (1) 1989-11-01
date of Availability (DAV) (2) 1989-12-13
date of Announcement (DOA) (3) 1990-03-01
date of Publication (DOP) (4) 1990-09-01
date of Withdrawal (DOW) (5) 1990-09-01


Superseded by  
Normative reference (6)  

(1) Date of ratification (dor) date when the Technical Board notes the approval of an EN (and HD for CENELEC), from which time the standard may be said to be approved

(2) Date of availability (dav) date when the definitive text in the official language versions of an approved CEN/CENELEC publication is distributed by the Central Secretariat

(3) Date of announcement (doa) latest date by which the existence of an EN (and HD for CENELEC), a TS or a CWA has to be announced at national level

(4) Date of publication (dop) latest date by which an EN has to be implemented at national level by publication of an identical national standard or by endorsement

(5) Date of withdrawal (dow) latest date by which national standards conflicting with an EN (and HD for CENELEC) have to be withdrawn

(6) This list of normative references is purely indicative. The only official list of normative reference is the list of the published standard.