HD 60364-4-42:2025/prAA:2025
(Amendment)Low-voltage electrical installations - Part 4-42: Protection for safety - Protection against thermal effects
Low-voltage electrical installations - Part 4-42: Protection for safety - Protection against thermal effects
This part of IEC 60364 applies to electrical installations with regard to measures for the protection of persons, livestock and property against: • thermal effects, risk of combustion or degradation of materials, and risk of burns caused by electrical equipment, • flames in case of a fire hazard being propagated from electrical installations to other fire compartments segregated by barriers which are in the vicinity, and • the impairment of the safe functioning of electrical equipment, including safety services due to thermal effects.
Nizkonapetostne električne inštalacije - 4-42. del: Zaščitni ukrepi - Zaščita pred toplotnimi učinki - Dopolnilo AA
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-november-2025
Nizkonapetostne električne inštalacije - 4-42. del: Zaščitni ukrepi - Zaščita pred
toplotnimi učinki - Dopolnilo AA
Low-voltage electrical installations - Part 4-42: Protection for safety - Protection against
thermal effects
Ta slovenski standard je istoveten z: HD 60364-4-42:2025/prAA:2025
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 DRAFT
HD 60364-4-42:2025
DOCUMENT D'HARMONISATION
HARMONISIERUNGSDOKUMENT
prAA
September 2025
ICS 29.120.50; 91.140.50 -
English Version
Low-voltage electrical installations - Part 4-42: Protection for
safety - Protection against thermal effects
To be completed To be completed
This draft amendment prAA, if approved, will modify the Harmonization Document HD 60364-4-42:2025; it is submitted to CENELEC
members for enquiry.
Deadline for CENELEC: 2025-11-28.
It has been drawn up by CLC/TC 64.
If this draft becomes an amendment, CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which
stipulate the conditions for implementation of this amendment on a national level.
This draft amendment, was established by CENELEC 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, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.
Warning : This document is not a Harmonization Document. It is distributed for review and comments. It is subject to change without notice
and shall not be referred to as a Harmonization Document.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Project: 81043 Ref. No. HD 60364-4-42:2025/prAA:2025 E
Contents Page
1 European foreword . 3
2 1 Addition to the European foreword . 4
3 2 Addition to 420.1, “Scope” . 4
4 3 Modifications to 420.2, “Normative references” . 4
5 4 Modification to subclause 421,“Protection against fire caused by electrical equipment” . 5
6 5 Modification to subclause 422.2.2, “Escape routes” . 5
7 6 Modification to subclause 422.3, “Locations with external influences classified as BE2,
8 fire risks, for nature of processed or stored materials” . 5
9 7 Modification to subclause 422.4, “Locations with external influences classified as CA2,
10 combustible, for construction materials” . 5
11 8 Modification to subclause 422.5, “Locations with external influences classified as CB2,
12 propagation of fire for building design” . 6
13 9 Modification to subclause 422.6, “Locations with irreplaceable goods or with business
14 critical facilities” . 6
15 10 Modification to Annex ZA, “Normative references to international publications with their
16 corresponding European publications” . 6
17 11 Addition of Annex ZB, “Special national conditions” and Annex ZC, “A-deviations” . 6
18 12 Replacement of the Bibliography . 14
19 European foreword
20 This document (HD 60364-4-42:2025/prAA:2025) has been prepared by CLC/TC 64 “Electrical installations
21 and protection against electric shock”.
22 This document is currently submitted to the Enquiry.
23 The following dates are proposed:
• latest date by which the existence of this (doa) dav + 6 months
document has to be announced at national
level
• latest date by which this document has to be (dop) dav + 12 months
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) dav + 36 months
conflicting with this document have to be (to be confirmed or
withdrawn modified when voting)
25 1 Addition to the European foreword
26 Add the following after item i) in the list of technical changes:
27 “j) For cables, the provisions of the Construction Products Regulation ((EU) No. 305/2011 (CPR)) came fully
28 into force on 1 July 2017 in respect of Reaction to Fire. These requirements are now expressed by reference
29 to the relevant class according to EN 13501-6.
30 NOTE See also Note 2 in the Scope.”
31 2 Addition to 420.1, “Scope”
32 Replace the NOTE with the following:
33 “
34 NOTE 1 For explosion risks, see IEC 60079-14.
35 In respect of cables and their reaction to fire, these protective measures can be expressed by reference to the
36 Construction Products Regulation (CPR), and the relevant classes according to EN 13501-6.
37 NOTE 2 Whilst the CPR requires the manufacturer to declare the reaction to fire performance of the cable in
38 accordance with procedures and classifications that are common across the EU, it is the responsibility of the Member
39 State to determine which classification is required for any particular application or installation. National statutory
40 requirements could therefore override the levels quoted here.”
41 3 Modifications to 420.2, “Normative references”
42 Delete the following normative reference:
43 IEC 60332 (all parts), Tests on electric and optical fibre cables under fire conditions
44 Add the following normative references:
45 EN 13501-6, Fire classification of construction products and building elements - Part 6: Classification using
46 data from reaction to fire tests on electric cables
47 EN IEC 60670-1, Boxes and enclosures for electrical accessories for household and similar fixed electrical
48 installations - Part 1: General requirements (IEC 60670-1)
49 Replace the following normative references:
50 HD 60364-4-43:2023, Low-voltage electrical installations - Part 4-43: Protection for safety - Protection against
51 overcurrent
52 HD 60364-5-53:2022, Low-voltage electrical installations - Part 5-53: Selection and erection of electrical
53 equipment - Switchgear and controlgear
54 EN 61084 (all parts), Cable trunking systems and cable ducting systems for electrical installations
55 EN 61386 (all parts), Conduit systems for cable management
56 EN 61534 (all parts), Powertrack systems
57 EN 61537, Cable management - Cable tray systems and cable ladder systems
58 EN 60598-2-24, Luminaires - Part 2-24: Particular requirements - Luminaires with limited surface
59 temperatures
60 EN 62606, General requirements for arc fault detection devices
61 4 Modification to subclause 421,“Protection against fire caused by electrical
62 equipment”
63 Replace 421.6 with the following:
64 “421.6 In domestic and similar installations, considerations should be given to provide measures for
65 preventing fires originating from the use of an electrical stove/cooker/hob to be propagated to its environment,
66 for example precautions for fire prevention according to EN 50615:2015.”
67 5 Modification to subclause 422.2.2, “Escape routes”
68 Replace the subclause 422.2.2.5 with the following:
69 “422.2.2.5 Wiring systems shall be non-flame propagating. Compliance with this requirement may be achieved
70 by using:
71 — cables satisfying the requirements specified in EN 13501-6 for at least class:
72 — Cca-s1,d2,a1 for those permanently installed in environment BD2 or BD3;
73 — B2ca-s1,d2,a1 for those permanently installed in environment BD4;
74 — conduit systems classified as non-flame propagating in accordance with the EN 61386 series;
75 — cable trunking systems or cable ducting systems classified as non-flame propagating in accordance with
76 the EN 50085 series;
77 — cable tray systems and cable ladder systems classified as non-flame propagating in accordance with
78 EN 61537;
79 — powertrack systems in accordance with the EN 61534 series.”
80 Replace the second sentence in 422.2.2.6 with the following:
81 “It is recommended to apply at least class Cca-s1,d2,a1 for cables installed in environment BD 2 or BD 3 and
82 to apply at least class B2ca-s1,d2,a1 for cables installed in environment BD 4.”.
83 6 Modification to subclause 422.3, “Locations with external influences classified as
84 BE2, fire risks, for nature of processed or stored materials”
85 Replace the first dash in 422.3.3 with the following new list item:
86 “— cables shall satisfy as a minimum the fire test requirements of class Eca specified in EN 13501-6”
87 Replace the last paragraph and the NOTE in 422.3.3 with the following:
88 “Where the risk of flame propagation is high, e.g. in long vertical runs of bunched cables, it is recommended to
89 apply cables at least fulfilling the requirements of class C -s1,d2,a1 specified in EN 13501-6.”
ca
90 7 Modification to subclause 422.4, “Locations with external influences classified as
91 CA2, combustible, for construction materials”
92 Replace the text in 422.4.2 with the following:
93 “422.4.2 Where cables are installed, consideration should be given to use cables at least satisfying the
94 requirements of class C -s1,d2,a1 specified in EN 13501-6.”
ca
95 8 Modification to subclause 422.5, “Locations with external influences classified as
96 CB2, propagation of fire for building design”
97 Replace the second and third paragraph in 422.5 with the following:
98 “Fire detectors which ensure the implementation of measures for preventing propagation of fire, for example,
99 the closing of fire-proof shutters in ducts, building voids and the like may be provided.
100 Boxes and enclosures according to EN 60670-1 for hollow walls shall be used. Cables shall at least satisfy the
101 requirements of class Cca-s1,d2,a1 specified in EN 13501-6.”
102 9 Modification to subclause 422.6, “Locations with irreplaceable goods or with
103 business critical facilities”
104 Replace the third paragraph in 422.6 with the following:
105 “Wiring systems shall be non-flame propagating. Compliance with this requirement may be achieved by using:
106 — cables at least satisfying the requirements for class Cca-s1,d2,a1, specified in EN 13501-6;
107 — conduit systems classified as non-flame propagating according to EN 61386 series;
108 — cable trunking systems or cable ducting systems classified as non-flame propagating according to the
109 EN 50085 series;
110 — cable tray systems and cable ladder systems classified as non-flame propagating according to EN 61537;
111 — powertrack systems according to EN 61534 series.”
112 10 Modification to Annex ZA, “Normative references to international publications
113 with their corresponding European publications”
114 Add the following references:
Publication Year Title EN/HD Year
Fire classification of construction products and EN 13501-6 -
building elements - Part 6: Classification using
data from reaction to fire tests on electric cables
115 11 Addition of Annex ZB, “Special national conditions” and Annex ZC, “A-deviations”
116 Add the following annexes:
117 Annex ZB
118 (normative)
120 Special national conditions
122 Special national condition: National characteristic or practice that cannot be changed even over a long
123 period, e.g. climatic conditions, electrical earthing conditions.
124 NOTE If it affects harmonization, it forms part of the Harmonization Document.
125 For the countries in which the relevant special national conditions apply these provisions are normative, for
126 other countries they are informative.
Country Clause Special national condition
Germany 420.3.8 Replace text of Clause 420.3.8 with the following new wording:
420.3.8
final circuit arc fault
arc fault occurring in a final circuit causing a current not exceeding the
design current of the final circuit
Note 1 to entry: The main risk of final circuit arc faults are thermal effects
which can cause fire.
Norway 420.3.11 In Norway, the term of “escape route” is replaced with the term “protected
escape route” with the definition “fire compartment provided to establish a
route to follow for access to a safe place in the event of an emergency”.
Germany 420.3.15 Add an additional Note to the definition of flammable, to read as follows:
Note 1 to entry: materials are categorized as “non-combustible”, “difficult
to ignite”, normal combustible” and “easy to ignite”.
Norway 421.2 Add the following note:
NOTE A fire hazard is present where combustible supporting material can attain
a temperature above 80 °C.
Germany 421.3 Add the following note:
NOTE For example, fibre silicate sheet at least 20 mm thickness can be
considered arc-resistant.
Germany 421.4 The NOTE in 421.4 does not apply for Germany.
United 421.6 In the United Kingdom, the requirements of IEC 60364-4-42 apply to fixed
Kingdom electrical installations and not electrical products such as electric stoves
which comply with other manufacturing standards.
United 422.1 to 422.3.5 In the United Kingdom, 422.1 to 422.3.5 do not apply, as specific national
Kingdom legislation and guidance is provided to comply with United Kingdom
national statutory requirements on fire engineering and fire safety
construction.
Norway 422.1.2 In Norway, this requirement does not apply to installations subject to
external influence of CA2 as specified in 422.4.
Austria 422.2 Clause 422.2 does not apply in Austria
Italy 422 In Italy, the requirements of Chapter 42 apply partially as they could be
covered by Part 751 of CEI 64-8.
Country Clause Special national condition
Germany 422 Replace title of Clause 422 with:
422 Requirements for locations with special risks due to external
influences
Switzerland 422.2.1.1 In Switzerland, the resistance to fire rating is defined by the national fire
protection regulations.
Norway 422.2.2 In Norway, the heading of 422.2.2 reads “Protected escape routes”.
Norway 422.2.2.7 (new) In Norway Clause 422.2.2.7 applies:
422.2.2.7 Cables and conductors shall, unless they are protected by an
automatic fire extinguishing system (for example a sprinkling system) not
represent a fire energy exceeding 50 MJ per meter length of the escape
route.
Germany 422.3.101 (new) Subclause 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.
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 DGUV 1 Principles of
Prevention.
The operator/user 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.
Germany 422.3.2 In Germany, the following Clause 422.3 applies:
In case of dust and/or fibbers, electrical equipment or their enclosure shall
have a protection degree of at least IP5X. In case of conductive dust, a
protection degree of at least IP6X is required.
In case of fire hazard due other highly flammable material different from
dust and/or fibres, electrical equipment shall have a protection degree of
at least IP4X except equipment for electrical heating where IPX2 is
permitted. The minimum distances defined by the manufacturer shall be
considered. For SELV or PELV circuits Clause 422.3.10 is applicabl
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