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



Reference prEN 50171:2013
Title Central safety power supply systems
Project Number 23607
Abstract/Scope This European Standard specifies the general requirements for central power supply systems for an independent energy supply to essential safety equipment. This standard covers systems that are permanently connected to AC supply voltages not exceeding 1 000 V and use batteries as an alternative power source. Central safety power supply systems are intended to ensure energy supply to emergency escape lighting in the event of normal supply failure and may be suitable for energising other essential safety equipment, for example: – electric circuits of automatic fire extinguishing installations; – paging systems and signalling safety installations; – smoke extraction equipment; – carbon monoxide warning systems; – special safety installations related to specific buildings, e.g. high-risk areas. Combination of the aforementioned equipment types should not be mixed together on the same central safety power supply system. Schematic representations of typical central safety power supply equipment are depicted in Clause 4. Power supply systems for fire alarm equipment that are covered by EN 54 are excluded.
Enquiry stage


Current Stage code 4060
Current Stage code date 2013-10-28
Current Stage code deadline 2013-11-18
Deadline date for vote  


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


IEC Technical Body  
Reference Document  
Keywords Central power; Power; Supply
Note Will supersede EN 50171:2001 * D139/C110: NWI approved * 2012-09-20: 9-month tolerance allocated
Special National Condition(s)  


Categories - Aspects
Product Life Cycle


Deadline Date
4060 2013-10-28 2013-11-18 export to doc file  EN
4020 2013-05-24 2013-10-25 export to doc file  EN  FR  DE
3099 2013-03-12    
2020 2011-08-10 2011-09-30  
1099 2011-06-01    
1000 2011-06-01 2011-08-31  

Implementation Dates

date of Ratification (DOR) (1)  
date of Availability (DAV) (2)  
date of Announcement (DOA) (3) -
date of Publication (DOP) (4) -
date of Withdrawal (DOW) (5) -


Supersedes EN 50171:2001
EN 50171:2001/corrigendum Aug. 2001
Superseded by  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.