prEN IEC 60079-18:2024
(Main)Explosive atmospheres - Part 18: Equipment protection by encapsulation "m"
Explosive atmospheres - Part 18: Equipment protection by encapsulation "m"
Explosionsgefährdete Bereiche - Teil 18: Geräteschutz durch Vergusskapselung „m“
Atmosphères explosives - Partie 18: Protection de l’appareil par encapsulage "m"
Eksplozivne atmosfere - 18. del: Zaščita opreme z zalivanjem z zalivno maso "m"
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Standards Content (Sample)
SLOVENSKI STANDARD
01-junij-2024
Eksplozivne atmosfere - 18. del: Zaščita opreme z zalivanjem z zalivno maso "m"
Explosive atmospheres - Part 18: Equipment protection by encapsulation "m"
Explosionsgefährdete Bereiche - Teil 18: Geräteschutz durch Vergusskapselung „m“
Atmosphères explosives - Partie 18: Protection du matériel par encapsulage "m"
Ta slovenski standard je istoveten z: prEN IEC 60079-18:2024
ICS:
29.260.20 Električni aparati za Electrical apparatus for
eksplozivna ozračja explosive atmospheres
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
31/1763/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60079-18 ED5
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2024-04-05 2024-06-28
SUPERSEDES DOCUMENTS:
31/1675/CD, 31/1698B/CC
IEC TC 31 : EQUIPMENT FOR EXPLOSIVE ATMOSPHERES
SECRETARIAT: SECRETARY:
United Kingdom Mr Tom Stack
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:
Other TC/SCs are requested to indicate their interest, if any, in this
CDV to the secretary.
FUNCTIONS CONCERNED:
EMC ENVIRONMENT QUALITY ASSURANCE SAFETY
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft
for Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
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are aware and to provide supporting documentation.
Recipients of this document are invited to submit, with their comments, notification of any relevant “In Some Countries” clau ses
to be included should this proposal proceed. Recipients are reminded that the CDV stage is the final stage for submitting ISC
clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).
TITLE:
Explosive atmospheres - Part 18: Equipment protection by encapsulation "m"
PROPOSED STABILITY DATE: 2028
NOTE FROM TC/SC OFFICERS:
electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.
You may not copy or "mirror" the file or printed version of the document, or any part of it, for any other purpose without
permission in writing from IEC.
31/1763/CDV – 2 – IEC 60079-18:2024 © IEC 2024
1 CONTENTS
2 FOREWORD . 5
3 1 Scope . 8
4 2 Normative references . 8
5 3 Terms and definitions . 9
6 4 General requirements . 10
7 4.1 Level of Protection (equipment protection level (EPL)) . 10
8 4.2 Rated voltage and maximum prospective current . 10
9 4.3 Additional requirements for levels of protection “ma” and “mb” . 10
10 5 Requirements for compounds . 10
11 5.1 General . 10
12 5.2 Specification . 10
13 5.3 Properties of the compound . 11
14 5.3.1 Water absorption . 11
15 5.3.2 Dielectric strength . 11
16 6 Temperatures . 11
17 6.1 General . 11
18 6.2 Maximum surface temperature . 11
19 6.3 Service temperature of the compound . 12
20 6.4 Temperature limitation of the “m” equipment . 12
21 7 Constructional requirements . 12
22 7.1 General . 12
23 7.2 Determination of faults . 12
24 7.2.1 Fault examination . 12
25 7.2.2 Components considered as not subject to fail . 13
26 7.2.3 Isolating components . 13
27 7.2.4 Infallible separation distances . 14
28 7.3 Free space in the encapsulation . 15
29 7.3.1 Group III “m” equipment . 15
30 7.3.2 Group I and Group II “m” equipment . 15
31 7.4 Thickness of the compound. 16
32 7.4.1 “m” equipment . 16
33 7.4.2 Windings for electrical machines . 18
34 7.4.3 Rigid, multi-layer printed wiring boards with through connections . 18
35 7.5 Switching contacts . 19
36 7.5.1 General . 19
37 7.5.2 Level of Protection “ma”. 20
38 7.5.3 Level of Protection “mb”. 20
39 7.5.4 Level of Protection “mc” . 20
40 7.6 External connections . 20
41 7.6.1 General . 20
42 7.7 Protection of bare live parts . 20
43 7.8 Cells and batteries . 20
44 7.8.1 General . 20
45 7.8.2 Prevention of gassing . 21
IEC 60079-18:2024 © IEC 2024 – 3 – 31/1763/CDV
46 7.8.3 Protection against inadmissible temperatures and damage to the cells
47 or batteries . 21
48 7.8.4 Reverse current . 21
49 7.8.5 Current limitation . 21
50 7.8.6 Protection against the polarity inversion and deep discharge of the cells . 22
51 7.8.7 Charging of cells or batteries . 22
52 7.8.8 Requirements for control safety devices for cells or batteries. 23
53 7.9 Protective devices . 23
54 7.9.1 General . 23
55 7.9.2 Electrical protective devices . 24
56 7.9.3 Thermal protective devices . 24
57 7.9.4 Built-in protective devices . 25
58 8 Type tests . 25
59 8.1 Tests on the compound . 25
60 8.1.1 Water absorption test . 25
61 8.1.2 Dielectric strength test . 25
62 8.2 Tests on the apparatus . 25
63 8.2.1 Test sequence . 25
64 8.2.2 Maximum temperature . 25
65 8.2.3 Thermal endurance test . 26
66 8.2.4 Dielectric strength test . 26
67 8.2.5 Cable pull test . 27
68 8.2.6 Pressure test for Group I and Group II electrical equipment . 28
69 8.2.7 Test for resettable thermal protective device. 28
70 8.2.8 Sealing test for built-in protective devices . 29
71 9 Routine verifications and tests . 29
72 9.1 Visual inspections . 29
73 9.2 Dielectric strength test . 29
74 10 Marking . 30
75 Annex A (informative) Basic requirements for compounds for “m” equipment . 31
76 Annex B (informative) Allocation of test samples . 32
77 Annex C (normative) Dielectric strength test between circuits and environment . 33
78 C.1 General . 33
79 C.2 Batch test procedure . 33
80 Bibliography . 34
82 Figure 1 – Dimensional key for thickness through the compound . 17
83 Figure 2 – Minimum distances for multi-layer printed wiring boards . 19
84 Figure 3 – Fitting of blocking diodes . 21
85 Figure A.1 – Basic requirements for compounds for “m” equipment . 31
87 Table 1 – Distances through the compound . 14
88 Table 2 – Minimum thickness of compound adjacent to free space for Group III “m”
89 equipment . 15
90 Table 3 – Minimum thickness of compound adjacent to free space for Group I and
91 Group II “m” equipment . 16
92 Table 4 – Thickness of the compound . 18
31/1763/CDV – 4 – IEC 60079-18:2024 © IEC 2024
93 Table 5 – Minimum distances for multi-layer printed wiring boards . 19
94 Table 6 – Test pressure . 28
95 Table B.1 – Allocation of test samples . 32
IEC 60079-18:2024 © IEC 2024 – 5 – 31/1763/CDV
98 INTERNATIONAL ELECTROTECHNICAL COMMISSION
99 ____________
101 EXPLOSIVE ATMOSPHERES –
103 Part 18: Equipment protection by encapsulation “m”
105 FOREWORD
106 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
107 all national electrotechnical committees (IEC National Committees). The object of IEC
...
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