SIST EN 61010-1:2010/kprA2:2026

• Status: Not Published
• Public Enquiry End Date: 30-May-2025
• ICS: 19.080 - Electrical and electronic testing
• ICS: 71.040.10 - Chemical laboratories. Laboratory equipment
• Technical Committee: MOV - Measuring equipment for electromagnetic quantities
• Current Stage: 5020 - Formal vote (FV) (Adopted Project)
• Start Date: 28-Jul-2026
• Due Date: 15-Sep-2026
• Completion Date: 08-Sep-2026
• Directive: 2014/35/EU - Directive 2014/35/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of electrical equipment designed for use within certain voltage limits
• Mandate: M/511 - Mandate to CEN, CENELEC and ETSI relating to harmonised standards in the field of the Low Voltage Directive
• Ref Project: EN 61010-1:2010/FprA2:2026 - Amendment 2 - Safety requirements for electrical equipment for measurement, control, and laboratory use - Part 1: General requirements

• Amends: SIST EN 61010-1:2010 - Safety requirements for electrical equipment for measurement, control and laboratory use - Part 1: General requirements (IEC 61010-1:2010)
• Effective Date: 09-Nov-2021

SIST EN 61010-1:2010/kprA2:2026 is the Slovenian adoption of Amendment 2 to EN 61010-1:2010, published by SIST. It updates the general safety requirements for electrical equipment for measurement, control, and laboratory use, including accessories, and is intended for manufacturers, test laboratories, certification teams, and technical committees that prepare related product standards.

What does SIST EN 61010-1:2010/kprA2:2026 specify?

SIST EN 61010-1:2010/kprA2:2026 specifies general safety requirements for electrical equipment for measurement, control, and laboratory use wherever the equipment is intended to be used. It is a product safety document, and the introduction says it is also meant to support technical committees writing standards for similar products.

The amendment is organized around Clause 1 on scope and aspects, Clause 2 on normative references, Clause 3 on terms and definitions, Clause 4 on assessment, tests, and environmental conditions, Clause 5 on marking and documentation, and hazard-specific clauses that follow. It also updates Annex K, Annex L, Annex O, and Annex P.

Annex	What it covers
Annex K	Insulation requirements not covered by Clause 6.7
Annex L	Index of defined terms
Annex O	Recurrent tests and tests after repair
Annex P	Electrochemical potentials

What are the key requirements of SIST EN 61010-1:2010/kprA2:2026?

SIST EN 61010-1:2010/kprA2:2026 keeps the safety model centered on reducing hazards to a tolerable level for the OPERATOR, SERVICE PERSONNEL, and the surrounding area. It also makes clear that the document works with the manufacturer’s own risk assessment and risk reduction process, rather than replacing it.

Scope and application

The amendment states that the document applies to general safety requirements for the covered electrical equipment and accessories, including equipment that measures, indicates, monitors, inspects, analyses, or prepares materials. For equipment that detects and signals an imminent hazardous level, the document applies only when used with a standard that adds performance and reliability requirements, and otherwise Clause 17 is used for risk assessment.

In practice, this means a manufacturer must decide whether the equipment falls under the general standard alone or under a Part 2 standard as well. It also means that alarm and detection products need a clear safety strategy, not just electrical protection.

Exclusions and companion parts

SIST EN 61010-1:2010/kprA2:2026 excludes equipment already covered by other named standards, including household appliances, building electrical installations, low-voltage switchgear and controlgear assemblies, medical electrical equipment, audio/video and ICT equipment, power transformers and similar products, hand-held probe assemblies, and two-pole low-voltage voltage detectors. The introduction also points to the IEC 61010-2 series as the place where special product requirements are added for specific equipment types.

For users, that means the standard is the general base document, but not the only document to read. If the product is a centrifuge, refrigerating unit, control equipment, valve actuator, X-ray system, IVD device, or another named type, the matching Part 2 document must be used with it.

Assessment, test methods, and fault conditions

Clause 4 now frames conformity assessment around inspection, TYPE TESTS, and ROUTINE TESTS. It also requires testing both in reference test conditions and in SINGLE FAULT CONDITION, and it says manufacturers shall perform Annex F ROUTINE TESTS on all equipment produced with both HAZARDOUS LIVE parts and ACCESSIBLE conductive parts.

This matters because safety is not judged only on the finished design drawing. The equipment has to prove itself in normal operation and after one protection failure, which is how weak points are found before the product reaches users.

Environmental conditions used for safety evaluation

Clause 4 distinguishes normal environmental conditions from extended environmental conditions. The normal set covers indoor use and the usual limits for altitude, temperature, humidity, mains variation, transient and temporary overvoltages, and pollution degree, while the extended set covers outdoor use, higher altitude, wider temperature or humidity ranges, stronger overvoltages, and WET LOCATION when the manufacturer rates the equipment for them.

For designers and test houses, this means the declared environment is part of the safety case. A product intended for a harsher site needs the construction, insulation, and test plan to match that site.

Marking, supply information, and symbols

Clause 5 updates what has to be marked on the equipment and what can be moved into the documentation. It covers external electrical supply sources, supply voltage, frequency or type of supply, rated input power or current, and clear indication of selectable voltage settings.

This is important because the marking tells installers and users how to connect the equipment correctly and how to avoid using the wrong supply setting. The clause also updates symbol use for power, earth, protective conductor, shock warning, hot surface, radiation, and other safety indications.

Protection against the main hazards

The hazard clauses update the treatment of temperature, fluids, radiation, acoustic noise, hazardous substances, explosion, and implosion. Clause 10 covers temperatures of accessible surfaces, windings, non-metallic enclosures, and insulating materials; Clause 11 covers IP code use, solid foreign objects, fluid pressure, leakage, and overpressure safety devices; Clause 12 covers ionizing radiation, optical radiation, microwave radiation, and acoustic noise.

In practical terms, this is where the document turns safety intent into measurable checks. A manufacturer has to show that accessible parts, fluid systems, radiation sources, and noise output stay within the applicable safety approach for the product.

Insulation and creepage/clearance rules

Annex K updates the insulation requirements not covered elsewhere, including CLEARANCE, CREEPAGE DISTANCE, solid insulation, printed wiring boards, thin-film insulation, and secondary circuits derived from MAINS CIRCUITS. It also ties the required distances and withstand tests to the applicable OVERVOLTAGE CATEGORY and WORKING VOLTAGE.

For engineering teams, Annex K is the main design and verification reference for electrical separation. It is the part that turns voltage stress, pollution degree, and circuit type into concrete insulation choices, test voltages, and inspection points.

What terms does SIST EN 61010-1:2010/kprA2:2026 define?

SIST EN 61010-1:2010/kprA2:2026 defines a set of safety terms so the requirements can be applied consistently.

• ACCESSIBLE - a part that can be touched with the specified test finger or test pin.
• HAZARD - a potential source of HARM.
• HAZARDOUS LIVE - capable of causing electric shock or electric burn.
• MAINS - the external low-voltage a.c. or d.c. supply system that powers the equipment.
• NORMAL USE - operation, including stand-by, according to the instructions for use or the obvious intended purpose.
• SINGLE FAULT CONDITION - a condition in which one protection means is defective or one fault is present that could lead to a hazardous situation.
• REASONABLY FORESEEABLE MISUSE - use that is not intended by the supplier but may result from predictable human behaviour.
• OVERVOLTAGE CATEGORY - the numeral used to define a transient overvoltage condition.

Who uses SIST EN 61010-1:2010/kprA2:2026?

SIST EN 61010-1:2010/kprA2:2026 is used by manufacturers of electrical measurement, control, and laboratory equipment when they design products and prepare conformity evidence. It is also used by test laboratories and certification teams when they run type tests, fault-condition tests, and routine tests.

Technical committees use it when drafting Part 2 product standards for specific equipment, and SERVICE PERSONNEL use its language when checking repairs and recurrent tests. The document is relevant wherever the equipment must be safe for OPERATOR use, maintenance, and installation in laboratory, control, and related technical environments.

What changed in SIST EN 61010-1:2010/kprA2:2026 from the previous edition?

SIST EN 61010-1:2010/kprA2:2026 is Amendment 2 to the third edition and the foreword describes it as a technical revision. It builds on the first amendment to the third edition, published in 2016.

The amendment updates the introduction, scope, exclusions, and normative references. It also adds and revises defined terms, rewrites the assessment and fault-testing rules, updates marking and supply-source information, and changes the safety treatment of temperature, fluids, radiation, acoustic noise, hazardous substances, insulation, and annex material.

Which standards are used with SIST EN 61010-1:2010/kprA2:2026?

SIST EN 61010-1:2010/kprA2:2026 is used together with the IEC 61010-2 series, which adds particular requirements for equipment such as laboratory heaters, refrigerating equipment, climatic and environmental testing equipment, centrifuges, test and measuring circuits, current sensors, multimeters, insulation resistance test equipment, sterilizers, mixers, atomic spectrometers, automatic laboratory equipment, cabinet X-ray systems, IVD medical equipment, educational equipment for children, control equipment, and electrically operated valve actuators.

It also points to IEC 61010-031 for hand-held and hand-manipulated probe assemblies. Other named standards contribute specific pieces of the safety framework, including IEC 60085 for insulation thermal evaluation, IEC 60695-11-3 for fire testing, IEC 61000-4-5 for surge immunity, IEC 61508 and IEC 62061 for functional safety, IEC 62471 and IEC TR 62471-2 for photobiological safety, ISO 7010 for safety signs, ISO 11228-1 and EN 1005-2 for manual handling and ergonomics, and ISO 13849-1 and ISO 13849-2 for safety-related control systems.

What does the SIST EN 61010-1:2010/kprA2:2026 document contain?

SIST EN 61010-1:2010/kprA2:2026 contains revised marking rules, symbol tables, and documentation requirements, including a table of supply and warning symbols. It also contains temperature test methods and tables, including the change-in-resistance method for windings and the ball-pressure test for insulating material.

Clause 11 contains methods for IP code-related documentation, solid foreign object protection, fluid leakage, rupture testing, and overpressure safety devices. Clause 12 contains the procedures and classification logic for ionizing radiation, optical radiation, microwave radiation, and acoustic noise.

Annex K contains the insulation design and test framework, with tables for clearances, creepage distances, and withstand tests for MAINS and secondary circuits, plus printed wiring board and thin-film methods. Annex O gives practical recurrent and after-repair tests for protective earth continuity, insulation resistance, and leakage current, while Annex P lists electrochemical potential pairs to help reduce corrosion where different metals contact each other.

SLOVENSKI STANDARD
SIST EN 61010-1:2010/oprA2:2025
01-maj-2025
Varnostne zahteve za električno opremo za meritve, nadzor in laboratorijsko
uporabo - 1. del: Splošne zahteve - Dopolnilo 2
Amendment 2 - Safety requirements for electrical equipment for measurement, control,
and laboratory use - Part 1: General requirements
Sicherheitsbestimmungen für elektrische Mess-, Steuer-, Regel- und Laborgeräte - Teil
1: Allgemeine Anforderungen
Amendement 2 - Règles de sécurité pour appareils électriques de mesurage, de
régulation et de laboratoire - Partie 1: Exigences générales
Ta slovenski standard je istoveten z: EN 61010-1:2010/prA2:2025
ICS:
19.080 Električno in elektronsko Electrical and electronic
preskušanje testing
71.040.10 Kemijski laboratoriji. Chemical laboratories.
Laboratorijska oprema Laboratory equipment
SIST EN 61010-1:2010/oprA2:2025 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

SIST EN 61010-1:2010/oprA2:2025

SIST EN 61010-1:2010/oprA2:2025

66/836/CDV
COMMITTEE DRAFT FOR VOTE (CDV)

PROJECT NUMBER:
IEC 61010-1/AMD2 ED3
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2025-03-07 2025-05-30
SUPERSEDES DOCUMENTS:
66/818/CD, 66/824B/CC
TC 66 : SAFETY OF MEASURING, CONTROL AND LABORATORY EQUIPMENT
IEC
SECRETARIAT: SECRETARY:
United Kingdom Ms Stephanie Lavy
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):
TC 66 Horizontal Group Safety
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:
Amendment 2 - Safety requirements for electrical equipment for measurement, control, and
laboratory use - Part 1: General requirements

PROPOSED STABILITY DATE: 2027
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 any other purpose without permission in writing from IEC.

SIST EN 61010-1:2010/oprA2:2025
IEC CDV 61010-1/AMD2 ED3 © IEC 2025 2 66/836/CDV
1 FOREWORD
2 This second amendment to the third edition builds on the first amendment to the third edition,
3 published in 2016. This amendment constitutes a technical revision.
4 Full information on the voting for the approval of this International Standard Amendment can
5 be found in the report on voting indicated in the above table.
6 This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
7 A list of all parts of the IEC 61010 series, under the general title Safety requirements for
8 electrical equipment for measurement, control, and laboratory use, can be found on the IEC
9 website.
10 The committee has decided that the contents of this document will remain unchanged until the
11 stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
12 the specific document. At this date, the document will be
13 • reconfirmed,
14 • withdrawn,
15 • replaced by a revised edition, or
16 • amended.
SIST EN 61010-1:2010/oprA2:2025
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19 INTRODUCTION
21 Replace the text of the existing introduction with the following text:
22 This document specifies the safety requirements that are generally applicable to all equipment
23 within its scope. For certain types of equipment, these requirements will be supplemented or
24 modified by the special requirements of the following parts 2 which must be read in conjunction
25 with the requirements of this document.
26 IEC 61010-2-010 Particular requirements for laboratory equipment for the heating of
27 materials
28 IEC 61010-2-011 Particular requirements for refrigerating equipment
29 IEC 61010-2-012 Particular requirements for climatic and environmental testing and
30 other temperature conditioning equipment
31 IEC 61010-2-020 Particular requirements for laboratory centrifuges
32 IEC 61010-2-030 Particular requirements for equipment having testing or measuring
33 circuits
34 IEC 61010-2-032 Particular requirements for hand-held and hand-manipulated current
35 sensors for electrical test and measurement
36 IEC 61010-2-033 Particular requirements for hand-held multimeters and other meters
37 for domestic and professional use, capable of measuring mains
38 voltage
39 IEC 61010-2-034 Particular requirements for measurement equipment for insulation
40 resistance and test equipment for electric strength
41 IEC 61010-2-040 Particular requirements for sterilizers and washer-disinfectors used
42 to treat medical materials
43 IEC 61010-2-051 Particular requirements for laboratory equipment for mixing and
44 stirring
45 IEC 61010-2-061 Particular requirements for laboratory atomic spectrometers with
46 thermal atomization and ionization
47 IEC 61010-2-081 Particular requirements for automatic and semi-automatic laboratory
48 equipment for analysis and other purposes
49 IEC 61010-2-091 Particular requirements for cabinet X-ray systems
50 IEC 61010-2-101 Particular requirements for in vitro diagnostic (IVD) medical
51 equipment
52 IEC 61010-2-130 Particular requirements for equipment intended to be used in
53 educational establishments by children
54 IEC 61010-2-201 Particular requirements for control equipment
55 IEC 61010-2-202 Particular requirements for electrically operated valve actuators
56 Attention is also drawn to the following standard:
57 IEC 61010-031 Safety requirements for electrical equipment for measurement,
58 control, and laboratory use - Part 031: Safety requirements for hand-
59 held and hand-manipulated probe assemblies for electrical test and
60 measurement
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62 SAFETY REQUIREMENTS FOR ELECTRICAL EQUIPMENT FOR
63 MEASUREMENT, CONTROL, AND LABORATORY USE –
65 Part 1: General requirements
69 1 Scope and object
70 1.1 Scope
71 1.1.1 Equipment included in scope
72 Replace the first two paragraphs with the following paragraph:
73 This document specifies general safety requirements for the following types of electrical
74 equipment and their accessories, wherever they are intended to be used.
76 Delete the last sentence of note 1.
77 In the second paragraph of item a), replace the word “standard” with the word “document”.
79 Replace the two paragraphs of item c) with the following paragraph:
80 This is equipment which measures, indicates, monitors, inspects or analyses materials, or
81 is used to prepare materials. This equipment may also be used in areas other than
82 laboratories.
84 Add the following two paragraphs at the end of this subclause:
85 This group safety publication is primarily intended to be used as a product safety standard for
86 the products mentioned in the scope but shall also be used by technical committees in the
87 preparation of their publications for products similar to those mentioned in the scope of this
88 document, in accordance with the principles laid down in IEC Guide 104 and lSO/lEC Guide 51.
89 One of the responsibilities of a technical committee is, wherever applicable, to make use of
90 basic safety publications and/or group safety publications in the preparation of its publications.
92 1.1.2 Equipment excluded from scope
93 Replace the text of this subclause with the following text:
94 This document does not apply to equipment within the scope of:
95 a) IEC 60335-1 (Household and similar electrical appliances);
96 b) IEC 60364-1 (Electrical installations of buildings);
97 c) IEC 61439-1 (Low-voltage switchgear and control gear assemblies);
98 d) IEC 60601-1 (Medical electrical equipment);
99 e) IEC 62368-1 (Audio/video, information and communication technology equipment, except
100 as specified in 14.1;
101 f) IEC 61558-1 (Power transformers, power supply units and similar);
102 g) IEC 61010-031 (Hand-held probe assemblies);
103 h) IEC 61243-3 (Live working – Voltage detectors – Part 3: Two-pole low-voltage type).

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105 1.1.3 Computing equipment
106 Replace in two locations the word “standard” with the word “document”.
108 Delete the note.
110 Add the following new clause 1.1.4
111 1.1.4 Detection or sensing equipment used for signalling or alarms
112 This document applies to equipment intended to detect and signal an imminent hazardous level
113 of physical or electrical quantities only when used in conjunction with a standard providing
114 additional requirements for performance and reliability (see 1.2.2). Where no such standard
115 exists, a RISK assessment procedure is specified in Clause 17.
116 NOTE 1 Detecting an imminent hazard is understood to include measuring, sensing or other methods of detecting
117 physical or electrical quantities with the intent of identifying a HAZARDOUS SITUATION.
118 NOTE 2 Signal is understood to include signalling, safety alarm initiation, notification and release, or other methods
119 of signalling when an imminent hazard has been detected. Examples include signalling beacons, lights, audible
120 alarms and sirens or automatic initiation of hazardous level mitigations such as ventilation or shutdown.
121 NOTE 3 Examples of standards that can be used in conjunction with this document (IEC 60079-29-1, IEC 62990-
122 1).
124 1.2 Objects
125 Replace the existing title with this following new title:
126 1.2 Aspects
128 1.2.1 Aspects included in scope
129 Replace the two first paragraphs with the following two new paragraphs:
130 The purpose of the requirements of this document is to ensure that HAZARDS to the OPERATOR,
131 SERVICE PERSONNEL, and the surrounding area are reduced to a tolerable level. This document
132 is intended to be used in conjunction with the manufacturer’s process of RISK assessment and
133 RISK reduction but not to replace it.
134 Requirements for protection against particular types of HAZARD are given in Clauses 6 to 13,
135 and 16, as follows:
137 Replace item f) of the second paragraph with the following new item f):
138 f) effects of radiation, sonic and ultrasonic pressure (see Clause 12);
140 Add a new item h):
141 h) HAZARDS related to the use and REASONABLY FORESEEABLE MISUSE of the equipment (see
142 Clause 16).
144 In the last paragraph, replace Clause 16 with Clause 17
145 1.2.2 Aspects excluded from scope
146 In the first paragraph, replace the word “standard” with the word “document”.

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148 In item b), delete the words “effectiveness of”.
150 Add two new items e) and f) to the list:
151 e) performance requirements of detectors for toxic gases (see the IEC 62990 series);
152 f) cybersecurity (see the IEC 62443 series).
154 1.3 Verification
155 Delete this subclause 1.3.
157 1.4 Environmental conditions
158 Delete this subclause 1.4.
160 2 Normative references
161 Delete the following references:
162 IEC 60065, Audio, video and similar electronic apparatus – Safety requirements
163 IEC 60335-2-24, Household and similar electrical appliances – Safety – Part 2-24: Particular
164 requirements for refrigerating appliances, ice-cream appliances and ice-makers.
165 IEC 60335-2-89, Household and similar electrical appliances – Safety – Part 2-89: Particular
166 requirements for commercial refrigerating appliances with an incorporated or remote refrigerant
167 condensing unit or compressor
168 IEC 60364-4-44:2007, Low-voltage electrical installations – Part 4-44: Protection for safety –
169 Protection against voltage disturbances and electromagnetic disturbances IEC 60364-4-
170 44:2007/AMD1:2015
171 IEC 60947-1, Low-voltage switchgear and controlgear – Part 1: General rules
172 IEC 61010-031, Safety requirements for electrical equipment for measurement, control and laboratory
173 use – Part 031: Safety requirements for hand-held probe assemblies for electrical measurement
174 and test
175 IEC 61180-1, High-voltage test techniques for low-voltage equipment – Part 1: Definitions, test
176 and procedure requirements
177 IEC 61180-2, High-voltage test techniques for low-voltage equipment – Part 2: Test equipment
178 ISO 361, Basic ionizing radiation symbol
179 EN 378-2, Refrigerating systems and heat pumps – Safety and environmental requirements.
180 Design, construction, testing, marking and documentation
182 Add the following references:
183 IEC 60085, Electrical insulation – Thermal evaluation and designation

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184 IEC 60384-14, Fixed capacitors for use in electronic equipment - Part 14: Sectional
185 specification - Fixed capacitors for electromagnetic interference suppression and connection to
186 the supply mains
187 IEC 60695-11-3, Fire hazard testing – Part 11-3: Test flames – 500 W flames - Apparatus and
188 confirmational test methods
189 IEC 61000-4-5:2014, Electromagnetic compatibility (EMC) - Part 4-5: Testing and measurement
190 techniques - Surge immunity test
191 IEC 61508 (all parts), Functional safety of electrical/electronic/programmable electronic safety-
192 related systems
193 IEC 62061, Safety of machinery - Functional safety of safety-related control systems
194 IEC 62368-1, Audio/video, information and communication technology equipment - Part 1:
195 Safety requirements
196 IEC 62471, Photobiological safety of lamps and lamp systems
197 IEC TR 62471-2, Photobiological safety of lamps and lamp systems – Part 2: Guidance on
198 manufacturing requirements relating to non-laser optical radiation safety
199 ISO 5349-1, Mechanical vibration – Measurement and evaluation of human exposure to hand
200 transmitted vibration – Part 1: General requirements
201 ISO 7010, Graphical symbols — Safety colours and safety signs — Registered safety signs
202 ISO 11228-1, Ergonomics – Manual Handling – Part 1: Lifting and carrying
203 ISO 13849-1, Safety of machinery – Safety-related parts of control systems – Part 1: General
204 principles for design
205 ISO 13849-2, Safety of machinery – Safety-related parts of control systems – Part 2: Validation
206 EN 1005-2, Safety of machinery – Human physical performance – Part 2: Manual handling of
207 machinery and component parts of machinery
209 Replace the following exiting references:
210 IEC 60664-3, Insulation coordination for equipment within low-voltage systems – Part 3: Use of
211 coating, potting or moulding for protection against pollution
212 IEC 61180 (all parts), High-voltage test techniques for low-voltage equipment
213 ISO 306:2013, Plastics – Thermoplastic materials – Determination of Vicat softening
214 temperature (VST)
215 with the following new references:
216 IEC 60664-3:2016, Insulation coordination for equipment within low-voltage systems – Part 3:
217 Use of coating, potting or moulding for protection against pollution
218 IEC 61180, High-voltage test techniques for low-voltage equipment - Definitions, test and
219 procedure requirements, test equipment
220 ISO 306:2022, Plastics – Thermoplastic materials – Determination of Vicat softening
221 temperature (VST)
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223 3 Terms and definitions
224 3.1 Equipment and states of equipment
225 Add the following new defined terms:
226 3.1.7
227 MOVABLE EQUIPMENT
228 equipment intended to be moved from one location to another while supported by its own wheels
229 or equivalent means
230 [IEC 62368-1:2023, 903-04-06, modified]
231 3.1.8
232 PANEL-MOUNTED EQUIPMENT
233 equipment where a portion of the equipment may form part of the ENCLOSURE
235 3.2 Parts and accessories
236 3.2.5
237 PROTECTIVE BARRIER
238 Replace the existing reference of the term with the following new reference:
239 [IEC 60050-195:2021, 195-06-15]
241 3.5 Safety terms
242 Replace the existing terms with the following new terms:
243 3.5.1
244 ACCESSIBLE (of a part)
245 able to be touched with a standard test finger or test pin, when used as specified in 6.2
246 3.5.2
247 HARM
248 injury or damage to the health of people, or damage to property or the environment
249 [ISO/IEC Guide 51:2014, 3.1]
250 3.5.3
251 HAZARD
252 potential source of HARM
253 [ISO/IEC Guide 51:2014, 3.2]
254 3.5.4
255 HAZARDOUS SITUATION
256 circumstance in which people, property or the environment is/are exposed to one or more
257 HAZARDS
258 [ISO/IEC Guide 51:2014, 3.4]
259 3.5.5
260 HAZARDOUS LIVE
261 capable of rendering an electric shock or electric burn
262 3.5.6
263 MAINS
264 Low-voltage a.c. or d.c. electrical power distribution system (external to the equipment) that
265 supplies operating power to the equipment

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266 Note 1 to entry: MAINS include public or private electrical utilities and, unless otherwise specified, equivalent sources
267 such as motor-driven generators and uninterruptible power supplies
268 [IEC 60664-1:2020, 3.1.2 (mains supply) modified]
269 3.5.7
270 MAINS CIRCUIT
271 circuit which is intended to be directly connected to the MAINS for the purpose of powering the
272 equipment
273 3.5.8
274 PROTECTIVE IMPEDANCE
275 component or assembly of components whose impedance, construction and reliability are
276 suitable to provide protection against electric shock
277 3.5.9
278 PROTECTIVE BONDING
279 electrical connection of ACCESSIBLE conductive parts or protective screening to provide
280 electrical continuity to the means for connection of an external protective conductor
281 3.5.10
282 NORMAL USE
283 operation, including stand-by, according to the instructions for use or for the obvious intended
284 purpose
285 3.5.11
286 NORMAL CONDITION
287 condition in which all means for protection against HAZARDS are intact
288 3.5.12
289 SINGLE FAULT CONDITION
290 condition in which one means for protection against HAZARD is defective or one fault is present
291 which could result in a HAZARDOUS SITUATION
292 SINGLE FAULT CONDITION results unavoidably in one or more other fault conditions, all the failures
Note 1 to entry: If a
293 are considered as one SINGLE FAULT CONDITION [IEC Guide 104].
294 3.5.13
295 OPERATOR
296 person operating equipment for its intended purpose
297 3.5.14
298 SERVICE PERSONNEL
299 persons having appropriate technical training and experience necessary to be aware of HAZARDS
300 to which they are exposed when performing a task and of measures to minimize the danger to
301 themselves or other persons
302 Note 1 to entry: Servicing may include, but is not limited to, installing, changing or repairing the equipment.
303 3.5.15
304 RESPONSIBLE BODY
305 individual or group responsible for the safe use and maintenance of equipment
306 3.5.16
307 WET LOCATION
308 location where water or another conductive liquid may be present and is likely to cause reduced
309 human body impedance due to wetting of the contact between the human body and the
310 equipment, or wetting of the contact between the human body and the environment
311 3.5.17
312 REASONABLY FORESEEABLE MISUSE
313 use of a product in a way not intended by the supplier, but which may result from readily
314 predictable human behaviour

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315 3.5.18
316 RISK
317 combination of the probability of occurrence of HARM and the severity of that HARM
318 3.5.19
319 TOLERABLE RISK
320 RISK which is accepted in a given context based on the current values of society
321 [ISO/IEC Guide 51:2014, 3.7]
322 3.5.20
323 OVERVOLTAGE CATEGORY
324 numeral defining a TRANSIENT OVERVOLTAGE condition (see Annex K)
325 3.5.21
326 TRANSIENT OVERVOLTAGE
327 short duration overvoltage of a few milliseconds or less, oscillatory or non-oscillatory, usually
328 highly damped
329 [IEC 60664-1:2020, 3.1.13]
330 3.5.22
331 TEMPORARY OVERVOLTAGE
332 power frequency overvoltage of relatively long duration
333 3.5.23
334 SAFETY FUNCTION
335 function of the equipment, whose failure can result in an immediate increase of the RISK(s)
336 [ISO 12100:2010, 3.30, modified]
337 3.5.24
338 SOFTWARE
339 assembly of programs, procedures, rules, documentation and data, pertaining to the operation
340 of an information processing device or system
341 EXAMPLE Firmware, operating system, application software.
342 [IEC 60050-195:2021, 171-01-21]
344 3.6 Insulation
345 Replace the existing terms with the following new terms:
346 3.6.1
347 BASIC INSULATION
348 insulation that provides basic protection
349 [IEC 60050-195:2021, 195-06-06]
350 Note 1 to entry: This concept does not apply to insulation used exclusively for functional purposes
351 3.6.2
352 SUPPLEMENTARY INSULATION
353 independent insulation applied in addition to BASIC INSULATION, that provides fault protection
354 [IEC 60050-195:2021, 195-06-07]
355 3.6.3
356 DOUBLE INSULATION
357 insulation comprising both BASIC INSULATION and SUPPLEMENTARY INSULATION
358 [IEC 60050-195:2021, 195-06-08]

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359 3.6.4
360 REINFORCED INSULATION
361 insulation which provides protection against electric shock equivalent to DOUBLE INSULATION
362 Note 1 to entry: REINFORCED INSULATION can comprise several layers which cannot be tested singly as BASIC
363 INSULATION or SUPPLEMENTARY INSULATION.
364 [IEC 60050-195:2021, 195-06-09, modified]
365 3.6.5
366 POLLUTION
367 addition of foreign matter, solid, liquid or gaseous (ionized gases), that may produce a reduction
368 of dielectric strength or surface resistivity
369 3.6.6
370 POLLUTION DEGREE
371 numeral indicating the level of POLLUTION that may be present in the environment
372 3.6.7
373 POLLUTION DEGREE 1
374 no POLLUTION or only dry, non-conductive POLLUTION occurs, which has no influence
375 3.6.8
376 POLLUTION DEGREE 2
377 only non-conductive POLLUTION occurs except that occasionally a temporary conductivity
378 caused by condensation is expected
379 3.6.9
380 POLLUTION DEGREE 3
381 conductive POLLUTION occurs, or dry, non-conductive POLLUTION occurs which becomes
382 conductive due to condensation which is expected
383 Note 1 to entry: In such conditions, equipment is normally protected against exposure to direct sunlight, precipitation,
384 and full wind pressure, but neither temperature nor humidity is controlled.
385 3.6.10
386 POLLUTION DEGREE 4
387 continuous conductivity occurs due to conductive dust, rain or other wet conditions
388 3.6.11
389 CLEARANCE
390 shortest distance in air between two conductive parts
391 [IEC 60050-426:2020, 426-04-12]
392 3.6.12
393 CREEPAGE DISTANCE
394 shortest distance along the surface of a solid insulating material between two conductive parts
395 [IEC 60050-151:2001, 151-15-50]
397 4 Tests
398 Replace the existing title with this following new title:
399 4 Assessment, tests, and environmental conditions
401 4.1 General
402 Delete the existing text and add the following four new subclauses:

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403 4.1.1 Conformity assessment
404 This document also specifies methods of checking conformity to the requirements of this
405 document. These are included in the conformity statements in all clauses of the document and
406 specifically in 4.3 and 4.4. The methods include inspection, TYPE TESTS and ROUTINE TESTS.
407 4.1.2 TYPE TESTS
408 In this document are TYPE TESTS to be carried out on samples of equipment or parts. Their only
409 purpose is to check that the design and construction ensure conformity with this document. In
410 addition, manufacturers shall perform the ROUTINE TESTS of Annex F on 100 % of equipment
411 produced which has both HAZARDOUS LIVE parts and ACCESSIBLE conductive parts.
412 The equipment shall at least meet the requirements of this document. It is permissible to exceed
413 the requirements. If, in this document, a lower limit is specified for a conformity value, then the
414 equipment may demonstrate a larger value. If an upper limit is specified for a conformity value,
415 the equipment may demonstrate a lower value.
416 Tests on subassemblies that meet the requirements of the relevant standards specified in this
417 document, and used in accordance with them, need not be repeated during TYPE TESTS of the
418 whole equipment.
419 Conformity with the requirements of this document is checked by carrying out all applicable
420 tests, except that a test may be omitted if examination of the equipment and design
421 documentation demonstrates conclusively that the equipment would pass the test. Tests are
422 carried out both under reference test conditions (see 4.3) and under fault conditions (see 4.4).
423 Where conformity statements in this document require inspection, this may include examination
424 of the equipment by measurement, examination of the markings on the equipment, examination
425 of the instructions supplied with the equipment, examination of the data sheets of the materials
426 or components from which the equipment is manufactured, etc. In each case, the inspection will
427 either demonstrate that the equipment meets the applicable requirements, or will indicate that
428 further testing is required.
429 Where the intended use or equipment functions present RISKS other than those mitigated in
430 Clauses 6 to 13 and Clause 16, Clause 17 is used to demonstrate such RISKS are reduced to a
431 tolerable level.
432 If, when carrying out a conformity test, there is any uncertainty about the exact value of an
433 applied or measured quantity (for example voltage) due to the tolerance:
434 a) manufacturers should ensure that at least the specified test value is applied;
435 b) test houses should ensure that no more than the specified test value is applied.
436 4.1.3 Environmental conditions
437 4.1.3.1 Normal environmental conditions
438 This document applies to equipment designed to be safe at least under the following conditions:
439 a) indoor use;
440 b) altitude up to 2 000 m;
441 c) ambient temperature 5 °C to 40 °C;
442 d) maximum relative humidity 80 % for temperatures up to 31 °C decreasing linearly to
443 50 % relative humidity at 40 °C;
444 e) MAINS supply voltage fluctuations up to ±10 % of the nominal voltage;
445 f) TRANSIENT OVERVOLTAGES up to the levels of OVERVOLTAGE CATEGORY ll;
446 NOTE 1 These levels of TRANSIENT OVERVOLTAGE are typical for equipment supplied from the building wiring.
447 g) TEMPORARY OVERVOLTAGES occurring on the MAINS supply;
448 h) applicable POLLUTION DEGREE of the intended environment (POLLUTION DEGREE 2 in most
449 cases).
450 NOTE 2 Manufacturers can specify more restricted environmental conditions for operation.

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451 4.1.3.2 Extended environmental conditions
452 This document applies to equipment designed to be safe not only in the environmental
453 conditions specified in 4.1.3.1, but also in any of the following conditions as RATED by the
454 manufacturer of the equipment:
455 a) outdoor use;
456 b) altitude above 2 000 m;
457 c) ambient temperatures below 5 °C or above 40 °C;
458 d) relative humidity above the levels specified in 4.1.3.1;
459 e) MAINS supply voltage fluctuations exceeding ±10 % of the nominal voltage;
460 f) TRANSIENT OVERVOLTAGES up to the levels of OVERVOLTAGE CATEGORY III or IV (see
461 Annex K).
462 g) WET LOCATION;
463 4.2 Sequence of tests
465 4.3 Reference test conditions
466 4.3.1 Environmental conditions
467 Replace the existing title and text of 4.3.1 with this following new title and text:
468 4.3.1 Environmental conditions for tests
469 Unless otherwise specified in this document, the following environmental conditions shall exist
470 in the test location:
471 a) a temperature of 15 °C to 35 °C;
472 b) a relative humidity of not more than 75 %, but not exceeding the limits of 4.1.3.1 d);
473 c) an atmospheric pressure of 75 kPa to 106 kPa;
474 d) no hoar-frost, dew, percolating water, rain, solar radiation, etc.
475 TRANSIENT OVERVOLTAGES, TEMPORARY OVERVOLTAGES, and POLLUTION DEGREE need not be
476 applied during the conformity tests of this document unless otherwise specified.
478 4.3.2 State of equipment
479 4.3.2.1 General
480 Replace the existing text with the following new text:
481 Unless otherwise specified, each test shall be carried out on the equipment assembled for
482 NORMAL USE and under the least favourable combination of the conditions given in 4.3.2.2 to
483 4.3.2.14.
484 NOTE In case of doubt, tests should be performed in more than one combination of conditions.
485 If dimensions or mass make it unsuitable to carry out particular tests on completely assembled
486 equipment, tests on sub-assemblies are allowed, provided it is verified that the assembled
487 equipment will meet the requirements of this document.
488 Combinations of reference test conditions may be different for each individual test and they
489 shall be recorded together with any measurements for each test. In case of doubt, tests shall
490 be performed in more than one combination of reference test conditions. If testing at the least
491 favourable RATED environmental conditions is necessary to allow assessment of conformity
492 criteria, the tests shall be conducted under these conditions.
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494 4.3.2.2 Position of equipment
495 Replace the existing text with the following new text:
496 The equipment shall be placed in any position of NORMAL USE as specified in the equipment
497 instructions. Equipment intended to be built into a wall, recess, cabinet, etc., shall be installed
498 as specified in the equipment instructions. For HAND-HELD EQUIPMENT, all possible orientations
499 are considered to be positions of NORMAL USE.
500 NOTE See also requirements for equipment installation in 5.4.3.
501 If there is no information in the equipment instructions for positioning or ventilation, the
502 temperature tests in NORMAL CONDITION shall be applied with the following requirements:
503 a) the equipment shall be placed in a corner in any orientation.
504 b) connected cables and supply lines shall bend freely.
505 c) for equipment sides without external connections, the equipment shall be as close to the
506 corner walls as practicable.
507 Equipment which can be oriented in more than one position, shall be assessed in every position.
508 If an examination of the equipment shows that the worst-case conditions can be found in one
509 position, a single test is sufficient in that case.
511 4.3.2.5 Electrical supply source
512 Replace the existing text with the following new text:
513 The following requirements apply as applicable.
514 a) The MAINS voltage shall be between 90 % and 110 % of any RATED supply voltage for which
515 the equipment can be set or, if the equipment is RATED for a greater fluctuation, at any
516 supply voltage within the fluctuation range.
517 b) The frequency shall be any RATED frequency.
518 c) Equipment for both a.c. and d.c. shall be connected to an a.c. or d.c. supply.
519 d) Equipment for single-phase a.c. supply shall be connected both with normal and reverse
520 polarity.
521 e) If the means of connection permits reversal, battery-operated and d.c. equipment shall be
522 connected with both reverse and normal polarity.
523 f) Equipment powered by other external means (for example: USB, 4-20 mA loop, PoE [Power
524 over Ethernet], wireless power transfer, etc.) shall be operated at each RATED voltage or
525 according to the specifications of each interface used as the electrical supply source.
526 g) Batteries shall be at whichever state of charge that represents the least favourable
527 condition. For test purposes, a d.c. source may be used.
529 4.3.2.6 Input and output voltages
530 Replace the existing text with the following new text:
531 Input and output voltages, including floating voltages but excluding the electrical supply source
532 voltage (see 4.3.2.5), shall be set to any voltage within the RATED voltage range.
534 4.3.2.12 Duty cycle
535 In the first paragraph, replace the word “manufacturer’s” with the word “equipment”.
537 Add the following new subclause after 4.3.2.13:

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538 4.3.2.14 External services
539 External services shall be supplied at the least favourable setting allowed by the equipment
540 instructions.
541 NOTE 1 External services include but are not limited to air or coolant.
542 NOTE 2 Least favourable settings can include but are not limited to temperature, pressure, and flow rate.
544 4.4 Testing in SINGLE FAULT CONDITION
545 4.4.1 General
546 Replace the existing text with the following new text:
547 The following requirements apply.
548 a) The equipment design, circuit diagrams, specifications, and operating instructions shall be
549 examined to identify the fault conditions which are liable to result in HAZARDOUS SITUATIONS
550 and which, therefore, shall be applied.
551 b) Fault tests shall be made as specified for checking conformity, unless it can be
552 demonstrated that no HAZARD could arise from a particular fault condition.
553 c) The equipment shall be operated under the least favourable combination of reference test
554 conditions (see 4.3). These combinations may be different for different faults and they shall
555 be recorded for each test. If the environmental limits of the reference test conditions (see
556 4.3) do not allow realistic assessment of SINGLE FAULT CONDITIONS, the test shall be
557 conducted at the least favourable RATED environmental conditions of the equipment.
558 d) SOFTWARE used in a SAFETY FUNCTION shall be considered to provide protection during
559 fault condition testing only if compliant with requirements of Clause 15. For SOFTWARE not
560 evaluated to Clause 15, the SOFTWARE function shall be disabled and is not considered a
561 SINGLE FAULT CONDITION.
563 4.4.2 Application of fault conditions
564 4.4.2.1 General
565 Replace the existing text with the following new text:
566 Fault conditions shall include:
567 1) Any fault conditions determined as applicable through the examination of the equipment as
568 required in clause 4.4.1.
569 2) Applicable fault conditions specified in 4.4.2.2 to 4.4.2.15.
570 3) Any fault condition specified in Clauses 6 to 16 dealing with the protection against each
571 HAZARD.
572 The fault conditions shall be applied only one at a time and shall be applied in turn in any
573 convenient order. Multiple simultaneous faults shall not be applied unless they are a
574 consequence of an applied fault.
575 NOTE For example, fans are stopped one fan at a time unless they share a common power or control source. In
576 that case, the common fans are stopped simultaneously by interrupting the power or control source.
577 After each application of a fault condition, the equipment or part shall pass the applicable tests
578 of 4.4.4.
580 4.4.2.7 MAINS transformers
581 Replace the existing title and subclauses of 4.4.2.7 with this following new title and subclauses:

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582 4.4.2.7 Transformers relied upon for safety
583 4.4.2.7.1 General
584 The output windings of transformers shall be short-circuited as specified in 4.4.2.7.2, and
585 overloaded as specified in 4.4.2.7.3.
586 A transformer damaged during one test may be repaired or replaced before the next test.
587 Tests for transformers tested as separate components are specified in 14.6.
588 Switch mode transformers and other pulse driven transformers shall be tested in the circuitry,
589 by short-circuiting an applicable component or connecting a load in parallel with the component.
590 4.4.2.7.2 Short circuit
591 Each untapped output winding, and each section of a tapped output winding, which is loaded in
592 NORMAL USE, shall be tested in turn, one at a time, to simulate short circuits in the load.
593 Overcurrent protection devices remain fitted during the test. All other windings are loaded or
594 not loaded, whichever load condition of NORMAL USE is less favourable.
595 NOTE The least favourable load conditions for other windings may vary for each test depending on the winding
596 subjected to short circuit conditions.
597 4.4.2.7.3 Overload
598 Each untapped output winding, and each section of a tapped output winding, is overloaded in
599 turn one at a time. During each test any other windings shall be loaded or not loaded, to achieve
600 the highest current through primary or output winding overcurrent protection without them
601 activating, whichever load condition of NORMAL USE is less favourable.
602 NOTE This test is to achieve the highest winding temperature of the transformer without exceeding the 1 hour
603 characteristic of any overcurrent protection.
604 If any overloads arise from testing in the fault conditions of 4.4, output windings shall be
605 subjected to those overloads.
606 Overloading is carried out by connecting a variable resistor across the winding or, in the case
607 of a switch mode transformer after the output rectifier. The resistor is adjusted as quickly as
608 possible and readjusted, if necessary, after 1 min to maintain the applicable overload. No
609 further readjustments are then permitted.
610 If overcurrent protection is provided by a current-breaking device, the overload test current is
611 the maximum current which the overcurrent protection device is just capable of passing for 1 h.
612 Before the test, the device is replaced by a link with negligible impedance. If this value cannot
613 be derived from the specification, it is to be established by test.
614 For equipment in which the output voltage is designed to collapse when a specified overload
615 current is reached, the overload current is slowly increased to just before the point which causes
616 the output voltage to collapse.
617 In all other cases, the loading is the maximum current obtainable from the output winding under
618 test, with any other windings loaded or not loaded, whichever represents the least favourable
619 condition.
620 Transformers with overtemperature protection which meets the requirements of 14.3 during the
621 short-circuit test of 4.4.2.7.2 need not be subjected to overload tests.
623 4.4.2.8 Outputs
624 Replace the existing text with the following new text:
625 Outputs shall be short-circuited and overloaded one at a time.
626 The output shall be overloaded to achieve the highest current through the overcurrent protection
627 without it activating, whichever load condition of NORMAL USE is less favourable.

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628 Overloading is carried out by connecting a variable resistor on the output. The resistor is
629 adjusted as quickly as possible and readjusted, if necessary, after 1 min to maintain the
630 applicable overload. No further readjustments are then permitted.
631 If overcurrent protection is provided by a current limiting device, the overload test current is the
632 maximum current which the overcurrent protection device is just capable of passing for 1 h.
633 Before the test, the device is replaced by a link with negligible impedance. If the maximum
634 current of the current limiting device cannot be derived from its specification, it is to be
635 established by a test prior to the overload test.
636 For equipment in which the output voltage is designed to collapse when a specified overload
637 current is reached, the overload current is slowly increased to just before the point which causes
638 the output voltage to collapse.
640 Add the following new subclause after 4.4.2.14:
641 4.4.2.15 Equipment design
642 For each circuit and component of the equipment design, the means of protection provided by
643 the equipment against a HAZARDOUS SITUATION arising under a SINGLE FAULT CONDITION shall be
644 assessed. In case of doubt, each component shall be tested under SINGLE FAULT CONDITION to
645 ensure the means of protection provided is not compromised. Particular attention shall be paid
646 to SINGLE FAULT CONDITIONS that may affect REINFORCED INSULATION or other singular means of
647 protection.
649 4.4.3 Duration of tests
650 4.4.3.1 General
651 Replace the existing text with the following new text:
652 The equipment shall be operated until further change as a result of the applied fault is unlikely.
653 If there is an indication that a HAZARD of electric shock, spread of fire or injury to persons may
654 eventually occur, the test shall be continued until the HAZARD occurs or until it becomes evident
655 that a HAZARD will not occur.
657 4.4.4 Conformity after application of fault conditions
658 4.4.4.2 Temperature
659 Replace the existing title with this following new title:
660 4.4.4.2 Touch temperature
663 5 Marking and documentation
664 5.1 Marking
665 5.1.1 General
666 Replace Note 1 with the following new Note:
667 NOTE Other IEC and ISO symbols are available.
669 Replace Note 2 with the following text:

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670 Markings shall not be on the bottom of the equipment, except on HAND-HELD or PORTABLE
671 EQUIPMENT where visibility by the operator is expected during installation or NORMAL USE
672 conditions.
674 5.1.2 Identification
675 Replace the Note of item b) with the new Note:
676 NOTE The marking of factory location can be in code and need not be on the equipment exterior.
678 5.1.3 MAINS supply
679 Replace the existing title, text and Table 1 with this following new title, text and Table 1:
680 5.1.3 External electrical supply sources
681 The equipment shall
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