oSIST prEN IEC 60940:2025
(Main)Application of capacitors, resistors, inductors and complete filter units for electromagnetic interference suppression - General rules and safety requirements
Application of capacitors, resistors, inductors and complete filter units for electromagnetic interference suppression - General rules and safety requirements
Grundlagen für die Anwendung von Kondensatoren, Widerständen, Drosseln und vollständigen Filtereinheiten zur Unterdrückung elektromagnetischer Störungen
Emploi des condensateurs, résistances, inductances et filtres complets d’antiparasitage - Règles générales et exigences de sécurité
Uporaba kondenzatorjev, uporov, tuljav in celotnih filtrskih enot za dušenje elektromagnetnih motenj - Splošna pravila in varnostne zahteve
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Standards Content (Sample)
SLOVENSKI STANDARD
01-julij-2025
Uporaba kondenzatorjev, uporov, tuljav in celotnih filtrskih enot za dušenje
elektromagnetnih motenj - Splošna pravila in varnostne zahteve
Application of capacitors, resistors, inductors and complete filter units for
electromagnetic interference suppression - General rules and safety requirements
Grundlagen für die Anwendung von Kondensatoren, Widerständen, Drosseln und
vollständigen Filtereinheiten zur Unterdrückung elektromagnetischer Störungen
Emploi des condensateurs, résistances, inductances et filtres complets d’antiparasitage -
Règles générales et exigences de sécurité
Ta slovenski standard je istoveten z: prEN IEC 60940:2025
ICS:
31.020 Elektronske komponente na Electronic components in
splošno general
33.100.01 Elektromagnetna združljivost Electromagnetic compatibility
na splošno in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
40/3221/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60940 ED3
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2025-06-06 2025-08-29
SUPERSEDES DOCUMENTS:
40/3174/CD, 40/3210/CC
IEC TC 40 : CAPACITORS AND RESISTORS FOR ELECTRONIC EQUIPMENT
SECRETARIAT: SECRETARY:
Netherlands Mr Ronald Drenthen
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):
TC 9,SC 22H,TC 23,SC 23B,SC 23E,SC 23J,SC
23K,SC 34C,SC 34D,TC 56,TC 61,SC 62A,SC 62D,TC
65,TC 72,TC 78,TC 96,TC 105,TC 108,TC 116
ASPECTS CONCERNED:
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the final stage for submitting ISC clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).
TITLE:
Application of capacitors, resistors, inductors and complete filter units for electromagnetic
interference suppression - General rules and safety requirements
PROPOSED STABILITY DATE: 2033
NOTE FROM TC/SC OFFICERS:
download this 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
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IEC CDV 60940 © IEC:2025 – 2 – 40/3221/CDV
1 CONTENTS
3 FOREWORD . 4
4 1 Scope . 6
5 2 Normative references . 6
6 3 Terms and definitions . 6
7 3.1 Voltage terms . 6
8 3.2 Safety terms . 7
9 4 Electromagnetic and Radio frequency interference suppression (EMI/RFI) . 8
10 4.1 General . 8
11 4.2 Limits of interference . 8
12 4.3 Classification of suppression components . 9
13 4.3.1 Suppression components . 9
14 4.3.2 Capacitors . 9
15 4.3.3 Resistors . 10
16 4.3.4 Inductors . 10
17 4.3.5 Filters . 10
18 5 General safety aspects . 11
19 5.1 EMI suppression components as a protective provision. 11
20 5.1.1 General considerations . 11
21 5.1.2 Single fault conditions . 11
22 5.1.3 Series connection of components . 11
23 5.2 Earth leakage current. 12
24 5.3 Hazards related to EMI suppression components caused by failures . 12
25 5.4 Information requirements . 12
26 6 Selection of EMI suppression components . 13
27 6.1 Choice of ratings for specific applications . 13
28 6.1.1 General aspects . 13
29 6.1.2 Voltages . 13
30 6.1.3 Current . 15
31 6.1.4 Environmental classification . 15
32 6.1.5 Insertion loss . 15
33 6.1.6 Capacitors . 16
34 6.1.7 Inductors . 17
35 6.1.8 Complete filter units . 17
36 6.2 Rules for capacitors in three phase EMI suppression filters . 17
37 7 Rules for determination of clearance and creepage distances. 18
38 7.1 General rules . 18
39 7.1.1 Dimensioning of clearances . 18
40 7.1.2 Dimensioning of creepage distances . 18
41 7.1.3 Component body and terminal insulation . 19
42 7.1.4 Precautions in handling and operation . 19
43 7.2 Rules for cased or conformal coated components with leads . 20
44 7.2.1 Measurement principle . 20
45 7.2.2 Creepage distance between terminals . 20
46 7.2.3 Clearance between terminals . 21
47 7.2.4 Clearance in mounted stage . 22
IEC CDV 60940 © IEC:2025 – 3 – 40/3221/CDV
48 7.2.5 Conductors between terminals . 23
49 7.3 Rules for surface mounted components . 23
50 7.3.1 Clearances and creepage distances – component body . 23
51 7.3.2 Clearances and creepage distances – components in mounted stage . 24
52 7.3.3 Requirements . 24
53 8 Passive and active flammability . 25
54 9 Use of X and Y capacitors in AC mains up to 400 Hz . 25
55 9.1 Overview . 25
56 9.2 Background . 25
57 9.3 Guidelines . 25
58 9.3.1 General . 25
59 9.3.2 Capacitors >10µF . 25
60 9.3.3 Voltage derating with. frequency . 25
61 Annex A Bibliography . 27
63 Figure 1 – Example use of suppression components in an EMI-filter . 9
64 Figure 2 – EMI capacitors star-connected . 17
65 Figure 3 – Cased and conformal coated types . 19
66 Figure 4 – Description . 20
67 Figure 5 – Creepage distance – cased style . 21
68 Figure 6 – Creepage distance – conformal coated style . 21
69 Figure 7 – Clearance between terminals . 21
70 Figure 8 – Clearance in mounted stage – cased style . 22
71 Figure 9 – Clearance - component body larger than lead pitch . 22
72 Figure 10 – Clearance – component body smaller than lead pitch . 23
73 Figure 11 – Clearance and creepage distances - different component styles. 23
74 Figure 12 – Clearance and creepage distances in mounted stage . 24
76 Table 1 – Criteria for cases where in OVC III and OVC IV C2 shall be class Y . 17
IEC CDV 60940 © IEC:2025 – 4 – 40/3221/CDV
80 INTERNATIONAL ELECTROTECHNICAL COMMISSION
81 ____________
83 APPLICATION OF CAPACITORS, RESISTORS, INDUCTORS AND
84 COMPLETE FILTER UNITS FOR ELECTROMAGNETIC INTERFERENCE
85 SUPPRESSION -
87 General rules and safety requirements
91 FOREWORD
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