HD 60364-4-42:2011

SLOVENSKI STANDARD
01-maj-2011
Nadomešča:
SIST HD 384.4.42 S1:2000
SIST HD 384.4.42 S1:2000/A1:2000
SIST HD 384.4.42 S1:2000/A2:2000
SIST HD 384.4.482 S1:2002
Nizkonapetostne električne inštalacije - 4-42. del: Zaščitni ukrepi - Zaščita pred
toplotnimi učinki (IEC 60364-4-42:2010, spremenjen)
Low voltage electrical installations - Part 4-42: Protection for safety - Protection against
thermal effects
Errichten von Niederspannungsanlagen - Teil 4-42: Schutzmaßnahmen - Schutz gegen
thermische Einflüsse
Installations électriques basse tension - Partie 4- 42: Protection pour assurer la sécurité -
Protection contre les effets thermiques
Ta slovenski standard je istoveten z: HD 60364-4-42:2011
ICS:
29.120.50 Varovalke in druga Fuses and other overcurrent
nadtokovna zaščita protection devices
91.140.50 Sistemi za oskrbo z elektriko Electricity supply systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

HARMONIZATION DOCUMENT
HD 60364-4-42
DOCUMENT D'HARMONISATION
March 2011
HARMONISIERUNGSDOKUMENT
ICS 29.120.50; 91.140.50 Supersedes HD 384.4.42 S1:1985 + A1:1992 + A2:1994

English version
Low voltage electrical installations -
Part 4-42: Protection for safety -
Protection against thermal effects
(IEC 60364-4-42:2010, modified)

Installations électriques basse tension -  Errichten von Niederspannungsanlagen -
Partie 4- 42: Protection pour assurer la Teil 4-42: Schutzmaßnahmen -
sécurité - Schutz gegen thermische Einflüsse
Protection contre les effets thermiques (IEC 60364-4-42:2010, modifiziert)
(CEI 60364-4-42:2010, modifiée)

This Harmonization Document was approved by CENELEC on 2011-02-14. CENELEC members are bound to
comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for implementation of this
Harmonization Document at national level.

Up-to-date lists and bibliographical references concerning such national implementations may be obtained on
application to the Central Secretariat or to any CENELEC member.

This Harmonization Document exists in three official versions (English, French, German).

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus,
the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Management Centre: Avenue Marnix 17, B - 1000 Brussels

© 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. HD 60364-4-42:2011 E
Foreword
The text of the International Standard IEC 60364-4-42:2010, prepared by IEC TC 64, Electrical installations
and protection against electric shock, together with common modifications prepared by the Technical
Committee CENELEC TC 64, Electrical installations and protection against electric shock, was submitted to
the formal vote and was approved by CENELEC as HD 60364-4-42 on 2011-02-14.

This European Standard supersedes HD 384.4.42 S1:1985 + A1:1992 + A2:1994.
The main changes with respect to HD 384.4.42 S1:1985 + A1:1992 + A2:1994 are listed below:
– The scope now includes protection against all thermal effects and flames in case of a fire hazard being
propagated from electrical installations to other fire compartments segregated by barriers which are in the
vicinity.
– Requirements associated with escape routes for evacuation in an emergency have been
expanded/modified.
– Requirements associated with the nature of processed or stored materials have been expanded/modified.
– Requirements associated with combustible constructional materials have been expanded/modified.
– Requirements associated with fire propagating structures have been modified slightly.
– New requirements for the selection and erection of installations in locations which might endanger
precious goods have been added.
– Protection against overheating now includes space heating appliances.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent rights.
The following dates were fixed:

– latest date by which the HD has to be implemented
at national level by publication of a harmonized
national standard or by endorsement (dop) 2012-02-14

– latest date by which the national standards conflicting
with the HD have to be withdrawn (dow) 2014-02-14
Annexes ZA to ZD have been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60364-4-42:2010 was approved by CENELEC as a Harmonization
Document with agreed common modifications as given below.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
[2] IEC 60079-14:1996 NOTE  Harmonized as EN 60079-14:1997 (not modified).
[5] IEC 60332-1-2:2004 NOTE  Harmonized as EN 60332-1-2:2004 (not modified).
[6] IEC 60332-3-21:2000 NOTE  Harmonized as EN 60332-3-21:2009 (modified).
[7] IEC 60332-3-22:2000 NOTE  Harmonized as EN 60332-3-22:2009 (not modified).

- 3 - HD 60364-4-42:2011
[8] IEC 60332-3-23:2000 NOTE  Harmonized as EN 60332-3-23:2009 (not modified).
[9] IEC 60332-3-24:2000 NOTE  Harmonized as EN 60332-3-24 (not modified).
[10] IEC 60332-3-25:2000 NOTE  Harmonized as EN 60332-3-25:2009 (not modified).
[11] IEC 60364-4-43 NOTE  Harmonized as HD 60364-4-43.
[13] IEC 60364-5-52 NOTE  Harmonized as HD 60364-5-52.
[16] IEC 60598 series NOTE  Harmonized in EN 60598 series (partially modified).
[17] IEC 60598-1:2003 NOTE  Harmonized as EN 60598-1:2004 (modified).
[18] IEC 60598-1:2008 NOTE  Harmonized as EN 60598-1:2008 (modified).
[19] IEC 60670-1 NOTE  Harmonized as EN 60670-1.
[20] IEC 60695-4 NOTE  Harmonized as EN 60695-4.
[21] IEC 60702-1 NOTE  Harmonized as EN 60702-1.
[22] IEC 60947-2 NOTE  Harmonized as EN 60947-2.
[23] IEC 61034-2 NOTE  Harmonized as EN 61034-2.
[25] IEC 61386-1 NOTE  Harmonized as EN 61386-1.
[26] IEC 61439-1 NOTE  Harmonized as EN 61439-1.
[27] IEC 62020 NOTE  Harmonized as EN 62020.
[28] IEC 62305 series NOTE  Harmonized in EN 62305 series (partially modified).

COMMON MODIFICATIONS
422 Precautions where particular risks of fire exist

422.3
Add the following note:
NOTE 3 Other locations having similar risk as those mentioned in IEC 60364-5-51, Table 51A, BE2 should also be considered, for
example commercial kitchens.
422.3.1
Modify the Note as follows:
F
Luminares marked    in accordance with EN 60598-1 are suitable for mounting on a normally flammable
surface.
422.3.9
Modify first line as follows:
Final circuits supplying or traversing the location and current using equipment, shall be protected against
insulation faults as follows:
422.3.12
Modify text as follows:
PEN conductors are not allowed in locations where condition BE2 applies, except for circuits traversing such
locations and having no connection between their traversing PEN conductor and any conductive part in this
location and erected in such a way as to reduce the risk of a fault between the pen conductor and any
conductive part in the location to a minimum.

Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year

IEC 60332 Series Tests on electric and optical fibre cables under EN 60332 Series
fire conditions
IEC 60364-4-41 2005 Low-voltage electrical installations - HD 60364-4-41 2007
(mod) Part 4-41: Protection for safety - Protection + corr. July 2007
against electric shock
IEC 60364-5-51 2005 Electrical installations of building - HD 60364-5-51 2009
(mod) Part 5-51: Selection and erection of electrical
equipment - Common rules
IEC 60598-2-24 - Luminaires - EN 60598-2-24 -
(mod) Part 2: Particular requirements -
Section 24: Luminaires with limited surface
temperatures
IEC 61084 Series Cable trunking and ducting systems for - -
electrical installations
IEC 61386 Series Conduit systems for cable management EN 61386 Series

IEC 61534 Series Powertrack systems EN 61534 Series

IEC 61537 - Cable management - Cable tray systems EN 61537 -
and cable ladder systems
- 5 - HD 60364-4-42:2011
Annex ZB
(normative)
Special national conditions
Special national condition: National characteristic or practice that cannot be changed even over a long
period, e.g. climatic conditions, electrical earthing conditions.

NOTE If it affects harmonization, it forms part of the Harmonization Document.

For the countries in which the relevant special national conditions apply these provisions are normative, for
other countries they are informative.

Country Clause Wording
No.
420.1 In Germany the following additional requirements to the scope apply to
the second indent of clause 420.1 - against flames and smoke in case of
Germany
a fire hazard being propagated from electrical installations to other fire
compartments segregated by barriers which are in the vicinity, and
421.3 In Germany the following additional requirements for protection against
arcing apply:
421.3 Protective devices shall be installed for protection in case of
arcing where the electrical installation shall meet a high degree of
reliability.
Protective devices for the protection against arcing shall detect the light
effect of the arc and the increase of current in the line conductors.
Furthermore, they shall extinguish the arc within a time of 5 ms and
disconnect the electrical installation from the supply. The extinguishing

of the arc may not be generated before the set limiting values regarding
the light and current detection are exceeded.

Slowly acting protective devices are not able to prevent damage of
goods and that can make it impossible to put the electrical installation in
to operation again within a short time.

In general a separation by use of a metal sheet does not provide the
required arc withstand capability.

421.7 Where in case of a fire hazard from switchgear assemblies heavy smoke
generation in escape corridors may be assumed a sealed fire barrier for
the erection of the switchgear assembly is necessary.

This requirement is fulfilled if the switchgear assembly is placed in an
enclosure of non-combustible material or in a separate location. Ceilings
and walls of the separating location shall have a fireresisting capability
for a time of at least 90 min and doors for a time of at least 30 min.

422.1.2 Additional requirements apply in Germany:
“In Germany for the selection and erection of electrical equipment

Chapter 53 “Erection of low voltage installations –
Part 530: Selection and erection of electrical equipment – Switchgear and
controlgear” applies in addition.”
422.3 Section 422.3 includes, for example, the selection and erection of
installations in locations with risks of fire due to the nature of processed
or stored materials like the manufacturing, processing, storage of
combustible materials, including the accumulation of dust in barns,

wood working factories, paper mills, textile factories or similar.

NOTE  The nature and allowed quantities of combustible materials, or surface or
volume of the locations may be regulated by national authorities.

Country Clause Wording
No.
422.3 Additional requirements apply in Germany:
In Germany the classification in fire-hazard areas is in the response of
the operator/user of the electrical installation, taking into account, if
necessary, the accident prevention regulation BGV A1 by the employers'
liability insurance association/EU-directive 89/654/EWG.
He should consult an expert for the classification. The publication
VdS 2033 „Feuergefährdete Betriebsstätten und diesen gleichzustellende
Risiken“, published by the German Insurance Association (GDV),
contains suitable case studies. Thereafter fire hazard areas are rooms or
places in the rooms or outside in which the danger insists that after local
and operational relations easily flammable materials in hazardous
amount comes closer to the electrical equipment in such a way, that
higher temperatures or arcs form a fire hazard. These can be areas like
work rooms, dry rooms and storerooms, hay camps, straw camps, jute
camps and flax camps as well as such sites outside, e.g., in paper,
textiles or wooden processing companies.
„Easily flammable“ are ignitable firm materials which burn, exposed to
the flame of a match for 10 s, and after removing the ignition source burn
and glow further by itself. Those materials are like hay or straw, straw
dust, shavings, loose wood-wool, magnesium filings, brushwood, loose
paper, tree and cell woollen fibres.
422.3.4 Additional requirements apply in Germany:
NOTE 3  PVC-jacketed cables, e.g., NYM and NYY, and the cable types in Table 1 fulfil the

requirements.
NOTE 4  The recommendation to use cable with improved fire characteristics, is fulfilled,
if the types are according to Table 1. This cable types have also an improved protection
against corrosion damages with halogens and smoke damages.

Table 1 − Halogen-free cable with improved fire characteristics

Type short- Standard
sign
NHXMH DIN VDE 0250-214
(VDE 0250 Teil 214)
NHMH DIN VDE 0250-215
(VDE 0250 Teil 215)
NSHXA DIN VDE 0250-606
(VDE 0250 Teil 606)
...