EN 50274:2002
(Main)Low-voltage switchgear and controlgear assemblies - Protection against electric shock - Protection against unintentional direct contact with hazardous live parts
Low-voltage switchgear and controlgear assemblies - Protection against electric shock - Protection against unintentional direct contact with hazardous live parts
This standard applies to low-voltage switchgear and controlgear assemblies with a rated voltage not exceeding AC 1 000 V or DC 1 500 V. It sets out the requirements for the provision of additional features to provide protection against electric shock from direct contact with hazardous live parts only for skilled and instructed persons when they are required to manually actuate devices within the assembly and where a level of protection for the operating face of not less than IPXXB cannot be achieved. These devices are those only accessible via a door or cover requiring a key or tool to open it or in an assembly located in an area set apart and where the access to that area is restricted solely to skilled or instructed persons. This standard does not apply to – manually operated devices and their locations where access is available to ordinary persons, – low-voltage switchgear and controlgear assemblies where the operating voltage does not exceed AC 50 V or DC 120 V and there is protective separation, in accordance with EN 61140, between these circuits and any other circuits, NOTE Voltages generated by means of auto-transformers, potentiometers, semiconductor components etc. do NOT meet these requirements. – low-voltage switchgear and controlgear assemblies where protection of persons is provided by limitation of steady-state touch current or charge in accordance with EN 61140.
Niederspannungs-Schaltgerätekombinationen - Schutz gegen elektrischen Schlag - Schutz gegen unabsichtliches direktes Berühren gefährlicher aktiver Teile
Ensembles d'appareillage à basse tension - Protection contre les chocs électriques - Protection contre le contact direct involontaire avec des parties actives dangereuses
Sestavi nizkonapetostnih stikalnih in krmilnih naprav - Zaščita pred električnim udarom - Zaščita pred nenamernim neposrednim stikom z nevarnimi deli pod napetostjo (vsebuje popravek AC:2009)
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2002
6HVWDYLQL]NRQDSHWRVWQLKVWLNDOQLKLQNUPLOQLKQDSUDY=DãþLWDSUHGHOHNWULþQLP
XGDURP=DãþLWDSUHGQHQDPHUQLPQHSRVUHGQLPVWLNRP]QHYDUQLPLGHOLSRG
QDSHWRVWMR YVHEXMHSRSUDYHN$&
Low-voltage switchgear and controlgear assemblies - Protection against electric shock -
Protection against unintentional direct contact with hazardous live parts
Niederspannungs-Schaltgerätekombinationen - Schutz gegen elektrischen Schlag -
Schutz gegen unabsichtliches direktes Berühren gefährlicher aktiver Teile
Ensembles d'appareillage à basse tension - Protection contre les chocs électriques -
Protection contre le contact direct involontaire avec des parties actives dangereuses
Ta slovenski standard je istoveten z: EN 50274:2002
ICS:
13.260 9DUVWYRSUHGHOHNWULþQLP Protection against electric
XGDURP'HORSRGQDSHWRVWMR shock. Live working
29.130.20 Nizkonapetostne stikalne in Low voltage switchgear and
krmilne naprave controlgear
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN 50274
NORME EUROPÉENNE
EUROPÄISCHE NORM April 2002
y 2009
ICS 29.120.60 Incorporates corrigendum Jul
English version
Low-voltage switchgear and controlgear assemblies -
Protection against electric shock -
Protection against unintentional direct contact with hazardous live parts
Ensembles d'appareillage à basse tension - Niederspannungs-
Protection contre les chocs électriques - Schaltgerätekombinationen -
Protection contre le contact direct Schutz gegen elektrischen Schlag -
involontaire avec des parties actives Schutz gegen unabsichtliches direktes
dangereuses Berühren gefährlicher aktiver Teile
This European Standard was approved by CENELEC on 2002-02-01. CENELEC members are bound to
comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and
notified to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic,
Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands,
Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2002 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50274:2002 E
Foreword
This European Standard has been prepared by WG 3 of Technical Committee CENELEC TC 17D, Low-voltage
switchgear and controlgear assemblies. It is intended as a complementary document to EN 60439-1. EN 60439-1
does not address in detail the issue of protection of skilled and instructed persons from electric shock when they
are required to gain access into the assembly to manually operated devices. The intent of this standard is to
provide additional requirements for the protection of these persons against electric shock.
The text of the draft has been submitted to the formal vote and was approved by CENELEC as EN 50274 on
2002-02-01.
The following dates were fixed:
– latest date by which the EN has to be implemented at
national level by publication of an identical national
standard or by endorsement (dop) 2003-02-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2005-02-01
Annexes designated "informative" are given for information only.
In this standard, annex A is informative.
The contents of the corrigendum of July 2009 have been included in this copy.
- 3 - EN 50274:2002
Contents
Page
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Definitions . 5
4 Requirements . 7
4.1 General requirements . 7
4.2 Positioning of operating devices . 7
4.3 Measures . 7
4.4 Space of protection . 7
4.5 Base area . 7
4.6 Access area . 8
4.7 Equipment installed on movable parts . 8
5 Tests . 8
5.1 Operating devices and access area . 8
5.2 Finger protected and back of the hand protected locations . 8
Annex A (informative) Figures for explanation . 9
Figure 1 – Permissible area for locating of operating devices . 9
Figure 2 – Maximum and minimum height of the base area depending on the service position .10
Figure 3 – Operating space for pushbutton actuation .11
Figure 4 – Operating space for actuation by rotary means .12
Figure 5 – Example for operating space during activation by pushbutton.13
Introduction
Within the European Community there are a number of Directives which impact upon electrical equipment
including switchgear and controlgear assemblies with regard to the health and safety of the users and others
when at work. The Framework Directive (89/391/EEC) on Health and Safety sets out in article 6 - General
Obligations on Employers. These include a set of criteria to be observed. This listing is in a preferred order, and
in the case of switchgear and controlgear assemblies and their operation, the intent can be summarised as
follows.
a) Remove the danger - in the case of assemblies where access inside for the operation of certain devices is
required, this can be achieved by either isolating the assembly before entry is permitted or ensuring that the
degree of protection of these devices and the accessible surrounding areas is not less than IPXXB
according to EN 60529. For assemblies located in areas set apart with access restricted to skilled and
instructed persons the assembly can be isolated before access is permitted or the operating device has a
degree of protection of not less than IPXXB according to EN 60529.
Or if this is not possible
b) Separate the person from the danger by means of screens, barriers or obstacles.
This standard sets out requirements according to b) for assemblies where the measures for the protection
of persons as set out in a) above cannot be achieved.
Or if this is not possible
c) Provide personal protective equipment to ensure the health and safety of the person – this is a measure of
last resort and is not considered suitable for these assemblies.
In addition, the requirements set out in both the Low Voltage Directive (73/23/EEC) and the use of Work
Equipment Directive (89/655/EEC) together with both of their Amending Directives (93/68/EEC and 95/63/EEC)
need to be observed. The particular article of the LVD to be considered is article 2 together with clauses 1 and 2
of annex 1.
Within the use of Work Equipment Directive, article 3 is particularly relevant to the design and construction of
switchgear and controlgear assemblies. Controls of any description should be sited in locations such that when
they are actuated, the operator is not exposed to any danger nor risks to health.
The preferred approach is to ensure that the assembly has a degree of protection not less than IPXXB at the
operating faces. Alternatively, the assembly should be designed and constructed so that the controls are set
apart in a safe location within the assembly where there are no hazardous live parts. It should be noted that the
Basic Safety Publication (EN 61140) sets a minimum level of protection against electric shock of IPXXB for
equipment.
- 5 - EN 50274:2002
1 Scope
This standard applies to low-voltage switchgear and controlgear assemblies with a rated voltage not exceeding
AC 1 000 V or DC 1 500 V. It sets out the requirements for the provision of additional features to provide
protection against electric shock from direct contact with hazardous live parts only for skilled and instructed
persons when they are required to manually actuate devices within the assembly and where a level of protection
for the operating face of not less than IPXXB cannot be achieved. These devices are those only accessible via a
door or cover requiring a key or tool to open it or in an assembly located in an area set apart and where the
access to that area is restricted solely to skilled or instructed persons.
This standard does not apply to
– manually operated devices and their locations where access is available to ordinary persons,
– low-voltage switchgear and controlgear assemblies where the operating voltage does not exceed AC 50 V
or DC 120 V and there is protective separation, in accordance with EN 61140, between these circuits and
any other circuits,
NOTE Voltages generated by means of auto-transformers, potentiometers, semiconductor components etc. do NOT
meet these requirements.
– low-voltage switchgear and controlgear assemblies where protection of persons is provided by limitation of
steady-state touch current or charge in accordance with EN 61140.
2 Normative references
This European Standard incorporates, by dated or undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text and the publications are listed hereafter. For
dated references, subsequent amendments to or revisions of any of these publications apply to this European
Standard only when incorporated in it by amendment or revision. For undated references, the latest edition of
the publication referred to applies (including amendments).
EN 60529, Degrees of protection provided by enclosures (IP Code) (IEC 60529)
EN 61032, Protection of persons and equipment by enclosures – Probes for verification (IEC 61032)
EN 61140, Protection against electric shock – Common aspects for installation and equipment (IEC 61140)
IEC 60050-195, International Electrotechnical Vocabulary – Part 195: Earthing and protection against electric
shock
IEC 60050-826, International Electrotechnical Vocabulary – Part 826: Electrical installations of buildings
3 Definitions
For the purposes of this European Standard, the following terms and definitions apply.
3.1
low-voltage switchgear and controlgear assembly (ASSEMBLY)
a combination of one or more low-voltage switching devices together with associated control, measuring,
signalling, protective, regulating equipment, etc., completely assembled under the responsibility of the
manufacturer with all internal electrical and mechanical interconnections and structural parts
3.2
hazardous live part
live part which, under certain conditions, can give a harmful electric shock [IEV 195-06-05]
3.3
operating device
actuator (e.g. pushbutton, toggle) and replaceable warning or protective device (e.g. screw plug fuse, flashing
light) which serves to operate, protect or indicate the operating status of an equipment or installation
3.4
protection against unintentional direct contact
protection of skilled and/or instructed persons against unintentional direct contact of hazardous live parts
NOTE Hazardous live parts are protected so as to prevent unintentional direct contact with fingers, hands, arms or other
parts of the body of an operator while actuating operating devices.
3.5
space of protection
space designated in an assembly where skilled and/or instructed persons can activate the operating devices
without danger; defined by the base area around the operating device and by the access area in front of the
operator
NOTE Space of protection is shown in Figure 2.
3.6
base area
area limiting the operating space at the side of the operating device
NOTE Base area is shown in
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