oSIST prEN IEC 62040-1:2025
(Main)Uninterruptible power systems (UPS) - Part 1: Safety requirements
Uninterruptible power systems (UPS) - Part 1: Safety requirements
Unterbrechungsfreie Stromversorgungssysteme (USV) - Teil 1: Sicherheitsanforderungen
Alimentations sans interruption (ASI) - Partie 1: Exigences de sécurité
Sistemi z neprekinjenim napajanjem (UPS) - 1. del: Varnostne zahteve
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Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2025
Sistemi z neprekinjenim napajanjem (UPS) - 1. del: Varnostne zahteve
Uninterruptible power systems (UPS) - Part 1: Safety requirements
Unterbrechungsfreie Stromversorgungssysteme (USV) - Teil 1:
Sicherheitsanforderungen
Alimentations sans interruption (ASI) - Partie 1: Exigences de sécurité
Ta slovenski standard je istoveten z: prEN IEC 62040-1:2025
ICS:
29.200 Usmerniki. Pretvorniki. Rectifiers. Convertors.
Stabilizirano električno Stabilized power supply
napajanje
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
22H/338/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 62040-1 ED3
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2025-07-11 2025-10-03
SUPERSEDES DOCUMENTS:
22H/329/CD, 22H/337A/CC
IEC SC 22H : UNINTERRUPTIBLE POWER SYSTEMS (UPS)
SECRETARIAT: SECRETARY:
France Mr Miao-Xin WANG
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):
TC 22,SC 22E,SC 22G,SC 121B
ASPECTS CONCERNED:
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.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of
which they 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”
clauses 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:
Uninterruptible power systems (UPS) - Part 1: Safety requirements
PROPOSED STABILITY DATE: 2026
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
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Internal
IEC CDV 62040-1 © IEC 2025
1 CONTENTS
7 FOREWORD . 4
8 INTRODUCTION . 7
9 1 Scope . 8
10 2 Normative references . 9
11 3 Terms and definitions . 9
12 4 Protection against hazards . 16
13 4.2 Single fault conditions and abnormal operating conditions . 16
14 4.3 Short-circuit and overload protection . 16
15 4.3.1 General . 16
16 4.3.2 Input short-circuit withstand strength and output short-circuit current ability . 17
17 4.3.101 AC input current . 18
18 4.3.102 Transformer protection . 18
19 4.3.103 Protection of the energy storage device . 19
20 4.3.104 Unsynchronised load transfer . 19
21 4.4 Protection against electric shock . 19
22 4.4.3 Means for basic protection (protection against direct contact) . 20
23 4.4.9 Capacitor discharge . 23
24 4.5.2 Service access areas . 23
25 4.6.5 Limited power sources . 25
26 4.8 UPS with multiple sources of supply . 25
27 4.8.101 Backfeed protection . 25
28 4.9 Protection against environmental stresses . 26
29 4.10 Protection against excessive acoustic noise hazards . 26
30 4.101 UPS isolation and disconnect devices . 26
31 4.101.1 Emergency switching (disconnect) device . 26
32 4.101.2 Normal disconnect devices . 27
33 4.102 Battery energy storage devices . 27
34 4.102.1 General . 27
35 4.102.2 Accessibility and maintainability. 28
36 4.102.3 Distance between battery cells . 28
37 4.102.4 Case insulation . 28
38 4.102.5 Electrolyte spillage . 28
39 4.102.6 Ventilation and hydrogen concentration (lead acid and nickel cadmium
40 batteries) . 28
41 4.102.7 Charging voltages . 29
42 4.102.8 Additional requirements for lithium ion batteries. 29
43 4.103 UPS connection to telecommunication networks . 29
IEC CDV 62040-1 © IEC 2025
44 5 Test requirements . 29
45 5.1.7 Test overview . 29
46 5.2.3 Electrical tests . 34
47 5.2.4 Abnormal operation and simulated faults tests . 37
48 6 Information and marking requirements . 45
49 6.1 General . 45
50 6.3.101 Guidance on UPS installation . 47
51 6.4.3 Labels, signs, symbols and signals . 47
52 6.5 Supplementary information . 49
53 6.5.2 Capacitor discharge . 49
54 6.5.101 Battery information for maintenance . 49
55 Annexes . 51
56 Annex AA (informative) Minimum and maximum cross-section of copper cables suitable
57 for connection to terminals for external cables . 52
58 Annex BB (informative) Comparison of limits of working voltage . 53
59 Annex CC (normative) Ventilation of lead-acid battery compartments . 55
60 CC.1 General . 55
61 CC.2 Normal conditions. 55
62 CC.3 Blocked conditions . 57
63 Annex DD (informative) Guidance for disconnection of batteries during shipment . 58
64 DD.1 Applicable products . 58
65 DD.2 Battery disconnection. 58
66 DD.3 Package labelling/marking . 58
67 DD.4 Damage inspection . 59
68 DD.5 The importance of safe handling procedures . 59
69 Annex EE (informative) Short-time withstand current test procedure – Guidance and
70 typical values . 60
71 EE.1 General . 60
72 EE.2 Test set up . 62
73 EE.3 Calibration of the test circuit. 62
74 EE.4 Test procedure . 63
75 EE.5 Test verification criteria . 63
76 Annex FF (informative) Maximum heating effect in transformer tests . 64
77 FF.1 Determination of maximum input current . 64
78 FF.2 Overload test procedure . 65
79 Annex GG (normative) Requirements for the mounting means of rack-mounted
80 equipment . 66
81 GG.1 General . 66
82 GG.2 Mechanical strength test, variable force . 66
83 GG.3 Mechanical strength test, 250 N force, including end stops. 67
84 GG.4 Compliance . 67
85 Bibliography . 68
87 Figure 101 – Examples of design of openings preventing vertical access . 18
IEC CDV 62040-1 © IEC 2025
88 Figure 102 – Test circuit for load-induced change of reference potential – Single-phase
89 output . 35
90 Figure 103 – Test circuit for load-induced change of reference potential – Three-phase
91 output . 35
92 Figure DD.1 – Example of precautionary labels for products shipped with the
93 battery disconnected . 56
94 Figure DD.2 – Example of precautionary label for products shipped with the
95 battery connected . 57
96 Figure EE.1 – 3-wire test circuit for UPS short-time withstand current . 59
97 Figure EE.2 – 4-wire test circuit for UPS short-time withstand current . 60
98 Figure EE.3 – 2-wire test circuit for single phase UPS short-time withstand current . 60
100 Table 1 – Alphabetical list of terms . 7
101 Table 101 – UPS AC input port configuration . 15
102 Table 5 – Limits for access of touch current . 19
103 Table 102 – Overvoltage categories . 20
104 Table 103 – Maximum temperature limits for magnetic components during stored
105 energy mode of operation . 22
106 Table 23 – Test overview . 28
107 Table 32 – AC short-time withstand current test, minimum UPS requirements . 39
108 Table 104 – Temperature limits for transformer windings .
...
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