EN 50736:2025

SLOVENSKI STANDARD
oSIST prEN 50736:2024
01-oktober-2024
Železniške naprave - Komunikacijski, signalni in procesni sistemi - Preskusne
zahteve za signalizacijo in telekomunikacijsko opremo
Railway application - Communication, signalling and processing system - Test
requirements for signalling and telecommunication equipment
Bahnanwendungen - Telekommunikationstechnik, Signaltechnik und
Datenverarbeitungssysteme - Prüfanforderungen für Signal- und
Telekommunikationsgeräte
Applications ferroviaires - Systèmes de signalisation, de télécommunication et de
traitement - Exigences de test pour les équipements de signalisation et de
télécommunication
Ta slovenski standard je istoveten z: prEN 50736:2024
ICS:
45.060.01 Železniška vozila na splošno Railway rolling stock in
general
oSIST prEN 50736:2024 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN 50736:2024
oSIST prEN 50736:2024
EUROPEAN STANDARD DRAFT
prEN 50736
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2024
ICS 45.060.01 -
English Version
Railway application - Communication, signalling and processing
system - Test requirements for signalling and telecommunication
equipment
Applications ferroviaires - Systèmes de signalisation, de Bahnanwendungen - Telekommunikationstechnik,
télécommunication et de traitement - Exigences de test Signaltechnik und Datenverarbeitungssysteme -
pour les équipements de signalisation et de Prüfanforderungen für Signal- und
télécommunication Telekommunikationsgeräte
This draft European Standard is submitted to CENELEC members for enquiry.
Deadline for CENELEC: 2024-10-25.

It has been drawn up by CLC/SC 9XA.

If this draft becomes a European Standard, CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which
stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CENELEC in three official versions (English, French, German).
A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to
the CEN-CENELEC Management Centre has the same status as the official versions.

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 European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.

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
© 2024 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Project: 77514 Ref. No. prEN 50736:2024 E

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Contents Page
1 European foreword . 5
2 Introduction . 6
3 1 Scope . 7
4 2 Normative references . 7
5 3 Terms and definitions . 8
6 3.1 Terms and definitions . 8
7 3.2 Symbols and abbreviations . 10
8 4 Relation between environmental conditions and test requirements . 10
9 5 Test requirements for type test . 12
10 5.1 General test requirements . 12
11 5.1.1 Test levels . 12
12 5.1.2 Standard atmospheric conditions . 12
13 5.1.3 Performance criteria . 12
14 5.1.4 Visual Inspection . 12
15 5.1.5 Performance test . 13
16 5.2 Insulation tests . 13
17 5.2.1 General . 13
18 5.2.2 Insulation resistance test . 14
19 5.2.3 Impulse test . 14
20 5.2.4 Voltage withstand test . 15
21 5.3 Temperature tests . 15
22 5.3.1 General . 15
23 5.3.2 Dry heat test . 16
24 5.3.3 Cold test . 18
25 5.4 Humidity test . 21
26 5.4.1 General . 21
27 5.4.2 Damp heat test . 21
28 5.5 Vibration and shock tests . 26
29 5.5.1 General . 26
30 5.5.2 Initial vibration response investigation . 27
31 5.5.3 Fatigue vibration test . 28
32 5.5.4 Shock test . 29
33 5.5.5 Final vibration response investigation . 30
34 5.6 Electromagnetic compatibility tests . 30
35 5.7 Surge test . 30
36 5.8 Test for protection against water ingress . 31
37 5.8.1 General . 31
38 5.8.2 Test requirements . 31
39 5.8.3 Test setup . 31
40 5.8.4 Test acceptance criteria . 31
41 5.9 Solar radiation tests . 31
42 5.9.1 General . 31
43 5.9.2 Simulated solar radiation tests . 32
44 5.9.3 Solar dry heat test . 34
45 5.10 Test for protection against dust and sand ingress . 35
46 5.10.1 General . 35
47 5.10.2 Test requirements . 35
48 5.10.3 Test setup . 36
49 5.10.4 Test acceptance criteria . 36
50 5.11 Test for protection against external mechanical impacts . 36
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51 5.11.1 General . 36
52 5.11.2 Test requirements . 37
53 5.11.3 Test setup. 37
54 5.11.4 Test acceptance criteria . 37
55 6 Documentation . 38
56 6.1 General . 38
57 6.2 Type test specification . 38
58 6.3 Type test report . 39
59 6.4 Type test compliance summary sheet . 39
60 Annex A (informative) Analysis of the environmental conditions . 40
61 A.1 General . 40
62 A.2 Pressure . 40
63 A.2.1 Altitude . 40
64 A.2.2 Pulse pressure . 42
65 A.3 Temperature . 42
66 A.4 Humidity . 42
67 A.5 Wind . 44
68 A.6 Rain . 44
69 A.7 Snow and hail . 44
70 A.7.1 Snow . 44
71 A.7.2 Hail . 45
72 A.8 Ice . 45
73 A.9 Solar radiation . 46
74 A.10 Lightning . 46
75 A.11 Pollution . 47
76 A.11.1 General . 47
77 A.11.2 Chemically and biologically active substances . 47
78 A.11.3 Mechanically active substances . 47
79 A.12 Fire protection . 48
80 A.13 Vibrations and shocks . 48
81 A.14 Electromagnetic compatibility . 49
82 A.15 Power supply . 49
83 Annex B (informative) Type test specification . 50
84 B.1 General . 50
85 B.2 Type test specification clauses . 50
86 B.2.1 Introduction . 50
87 B.2.2 Terms, definition and abbreviation . 50
88 B.2.3 Reference documents . 50
89 B.2.4 General description . 50
90 B.2.5 Equipment under test. 51
91 B.2.6 Installation environment . 51
92 B.2.7 Ports identification . 52
93 B.2.8 Performance test . 55
94 B.2.9 Visual inspection . 56
95 B.2.10 Correlation between performance test and the performance criteria . 56
96 B.2.11 Summary of all type tests to be performed on the EUT . 57
97 B.2.12 Insulation tests . 59
98 B.2.13 EMC tests . 59
99 B.2.14 Climatic tests . 60
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100 B.2.15 Vibration and shock tests . 60
101 B.2.16 Tests for protection against external agents . 60
102 B.2.17 Tests for protection against external mechanical impacts . 61
103 B.2.18 Power supply tests . 61
104 B.2.19 Additional tests . 61
105 Annex C (informative) Additional and not mandatory tests . 62
106 C.1 General . 62
107 C.2 Storage and transport temperature tests . 62
108 C.2.1 General . 62
109 C.2.2 Test setup . 62
110 C.2.3 Test requirements . 62
111 C.2.4 Test acceptance criteria . 64
112 C.3 Shock tests for transversal and longitudinal axis. 65
113 C.4 Impulse test for equipment without earth connection . 65
114 Annex D (informative) Tests selection guideline . 66
115 D.1 General . 66
116 D.2 Definition of equipment installation conditions . 66
117 D.3 Equipment for installation in locations protected from the weather. 67
118 D.4 Equipment for installation in locations not protected from the weather . 68
119 Annex E (informative) Examples for type test compliance summary sheet . 70
120 E.1 General . 70
121 E.2 Example 1 . 70
122 E.3 Example 2 . 71
123 Bibliography . 74
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124 European foreword
125 This document (prEN 50736:2024) has been prepared by CLC/SC 9XA "Communication, signalling and
126 processing systems” of CLC/TC 9X “Electrical and electronic applications for railways".
127 This document is currently submitted to the Enquiry
128 The following dates are proposed:
• latest date by which the existence of this (doa) dor + 6 months
document has to be announced at national
level
• latest date by which this document has to be (dop) dor + 12 months
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) dor + 36 months
conflicting with this document have to be (to be confirmed or
withdrawn modified when voting)
129 This document has been prepared according to Decision 57/5 taken during the SC 9XA meeting.
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130 Introduction
131 The environmental conditions for signalling and telecommunication equipment are specified by
132 EN 50125-3:2003, without defining test requirements and their related performance/acceptance criteria.
133 This document contains test requirements and performance/acceptance criteria for most of the mentioned
134 environmental conditions likely to be experienced in the railway applications and published in EN 50125-3:2003.
135 Furthermore, it clearly indicates for which environmental conditions no test methods are known and therefore
136 no meaningful test requirements can be defined.
137 Test requirements for the type test defined in this document consider the severity of the environmental
138 parameters provided for by EN 50125-3:2003, but those test requirements remain applicable even if the severity
139 levels requested by the customer differ.
140 This document has been prepared in the form of a Product Standard.
141 Where possible direct references are given to other existing standards to obtain a high degree of acceptance
142 and to reduce additional effort for testing.
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143 1 Scope
144 This document applies to railway signalling and telecommunication trackside equipment.
145 This document does not cover signalling and telecommunication equipment mounted in vehicles; these are
146 covered by EN 50155:2021.
147 This document covers the type testing phases of the equipment for signal and telecommunication (S&T) system
148 (including power supply systems belonging to S&T), in order to ensure compliance with specified requirements
149 already defined in the customer specifications or by the involved parties.
150 In particular this document intends to define test requirements with related performance / acceptance criteria,
151 considering only the environmental conditions stated by the EN 50125-3:2003, and considering the severities
152 of the environmental parameters herein defined.
153 Safety considerations are not covered by this document.
154 2 Normative references
155 The following documents are referred to in the text in such a way that some or all of their content constitutes
156 requirements of this document. For dated references, only the edition cited applies. For undated references, the
157 latest edition of the referenced document (including any amendments) applies.
158 EN 50121-4:2016, Railway applications - Electromagnetic compatibility - Part 4: Emission and immunity of the
159 signalling and telecommunications apparatus
160 EN 50124-1:2017, Railway applications - Insulation coordination - Part 1: Basic requirements - Clearances and
161 creepage distances for all electrical and electronic equipment
162 EN 50125-3:2003, Railway applications - Environmental conditions for equipment - Part 3: Equipment for
163 signalling and telecommunications
164 EN 60068-1:2014, Environmental testing - Part 1: General and guidance
165 EN 60068-2-1:2007, Environmental testing - Part 2-1: Tests - Test A: Cold
166 EN 60068-2-2:2007, Environmental testing - Part 2-2: Tests - Test B: Dry heat
167 EN 60068-2-27:2009, Environmental testing - Part 2-27: Tests - Test Ea and guidance: Shock
168 EN 60068-2-30:2005, Environmental testing - Part 2-30: Tests - Test Db: Damp heat, cyclic (12 h + 12 h cycle)
169 EN 60068-2-47:2005, Environmental testing - Part 2-47: Tests - Mounting of specimens for vibration, impact
170 and similar dynamic tests
171 EN IEC 60068-2-5:2018, Environmental testing - Part 2-5: Tests - Test S: Simulated solar radiation at ground
172 level and guidance for solar radiation testing and weathering
173 EN 60068-2-64:2008, Environmental testing - Part 2: Tests - Test Fh: Vibration, broadband random and
174 guidance
175 EN 60068-2-75:2014, Environmental testing - Part 2-75: Tests - Test Eh: Hammer tests

As impacted by EN 50121-4:2016/A1:2019.
As impacted by EN 50125-3:2003/corrigendum May 2010.
As impacted by EN 60068-2-64:2008/A1:2019.
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176 EN 60529:1991, Degrees of protection provided by enclosures (IP Code)
177 EN 61180:2016, High-voltage test techniques for low-voltage equipment - Definitions, test and procedure
178 requirements, test equipment
179 EN 62262:2002, Degrees of protection provided by enclosures for electrical equipment against external
180 mechanical impacts (IK code)
181 3 Terms and definitions
182 3.1 Terms and definitions
183 For the purposes of this document, the terms and definitions given in EN 50124-1:2017, EN 60068-2-64:2008
184 and the following apply.
185 ISO and IEC maintain terminology databases for use in standardization at the following addresses:
186 — ISO Online browsing platform: available at https://www.iso.org/obp/
187 — IEC Electropedia: available at https://www.electropedia.org/
188 3.1.1
189 enclosure
190 case, housing, or other part to protect the equipment against certain external influences
191 Note 1 to entry: The enclosure can offer protection to personnel, e.g. from electric shock.
192 Note 2 to entry: In this document insulating compound (e.g. potting, encapsulation and vacuum impregnation) used to protect
193 the equipment against external influences is considered as enclosure.
194 3.1.2
195 environmental condition
196 physical, chemical or biological condition, external to a product, to which it is subjected at a certain time
197 [SOURCE: EN 60721-1:1995, 3.1]
198 3.1.3
199 environmental factor
200 physical, chemical or biological influence which, either singly or in combination with other influences, produces
201 an environmental condition (e.g. heat, vibration)
202 [SOURCE: EN 60721-1:1995, 3.2]
203 3.1.4
204 environmental parameter
205 one or more physical, chemical or biological properties characterizing an environmental factor (e.g. temperature,
206 acceleration)
207 Note 1 to entry: For example, the environmental factor vibration is characterized by the parameters: type of vibration
208 (sinusoidal, random), acceleration and frequency.
209 [SOURCE: EN 60721-1:1995, 3.3, modified – The second part of the definition was moved to Note 1 to entry]

As impacted by EN 60529:1991/corrigendum May 1993, EN 60529:1991/A1:2000, EN 60529:1991/A2:2013,
EN 60529:1991/AC:2016-12 and EN 60529:1991/A2:2013/AC:2019-02.
As impacted by EN 62262:2002/A1:2021.
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210 3.1.5
211 equipment
212 single apparatus or set of devices or apparatuses, or the set of main devices of an installation, or all devices
213 necessary to perform a specific task.
214 EXAMPLES a power transformer, the equipment of a substation, measuring equipment
215 [SOURCE: IEC 60050-151:2001, 151-11-25]
216 3.1.6
217 operating temperature
218 temperature range in which the equipment is operating as specified.
219 Note 1 to entry: Outside of the operating temperature range there can be temporary or permanent degradation of the
220 equipment performances.
221 3.1.7
222 performance
223 characteristics defining the ability of an equipment to achieve the intended functions
224 [SOURCE: IEC 60050-311:2001, 311-06-11, modified – The terminological entry “measuring instrument” has
225 been replaced by “equipment”]
226 3.1.8
227 port
228 particular interface of the specified apparatus with the
229 external environment
230 EXAMPLES AC power port, DC power port, I/O (input/output) port, earth port.
231 [SOURCE: IEC 60050-821:2017, 821-11-37]
232 3.1.9
233 resonance frequency
234 frequency at which resonance exists and the acceleration measured in the response point
235 is more than three times respect the acceleration measured in the reference point
236 3.1.10
237 severity of environmental parameter
238 value of each quantity, characterizing the environmental parameter
239 EXAMPLE The severity of sinusoidal vibration is defined by values of the acceleration (in m/s ) and frequency (in Hz).
240 [SOURCE: EN 60721-1:1995, 3.4]
241 3.1.11
242 specified requirements
243 need or expectation that is stated
244 Note 1 to entry: Specified requirements can be stated in normative documents such as regulations, standards and technical
245 specifications.
246 Note 2 to entry: When the severity of an environmental parameter is chosen considering the environment where the
247 equipment has to be installed, this becomes a specified requirement. This is the target that the equipment has to fulfil.
248 Specified requirements can be defined by generic or product standards, by the customer in his specifications, or also by the
249 supplier, for example when don't exist specifications or standards, considering the environment where he intends to install
250 his components (e.g. the value of the environmental high temperature to which equipment can operate has to be 70 °C.).
251 [SOURCE: IEC 60050-902:2013, 902-02-01, modified – The Note 2 to entry has been added]
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252 3.1.12
253 system
254 set of interrelated elements considered in a defined context as a whole and separated from their environment
255 [SOURCE: IEC 60050-351:2013, 351-42-08, modified – The Notes to entry have been omitted.]
256 3.1.13
257 test fixture
258 apparatus to fix the equipment on the test device during testing
259 [SOURCE: ISO 19594:2017, 3.7, modified – The terminological entry “specimen” has been replaced by
260 “equipment”]
261 3.1.14
262 test requirements
263 prescriptions to be used during the tests
264 Note 1 to entry: These prescriptions are usually defined in generic or product standards. These prescriptions, that regulate
265 the parameters not properly defined by the basic standards, are necessary to make the test effective to ensure that the
266 specified requirements are met.
267 Note 2 to entry: e.g. the duration of the dry heat test has to be 10 h.
268 3.1.15
269 test procedure
270 set of instructions in order to obtain a test result
271 Note 1 to entry: Test procedures are usually defined in basic standards (e.g. the test procedures for dry heat test are
272 described in EN 60068-2-2:2007)
273 3.1.16
274 type test
275 conformity test made on one or more items representative of the production.
276 [SOURCE: IEC 60050-581:2008, 581-21-08]
277 3.2 Symbols and abbreviations
278 For the purposes of this document, the following abbreviations apply.
AC Alternating Current
ASD Acceleration Spectral Density
DC Direct Current
EMC Electro Magnetic Compatibility
EUT Equipment Under Test
PBA Printed Board Assembly
PCB Printed Circuit Board
SPD Surge Protection Device
279 4 Relation between environmental conditions and test requirements
280 The following clause define the relation between environmental conditions and the test requirements for type
281 test.
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282 Informative Annex A is added for a better understanding of the document. It shows the analysis of the
283 environmental conditions defined in EN 50125-3:2003 and their influence on the functioning of the EUT, and
284 also the relation with the test requirements for type tests defined in this document.
285 Table 1 shows the relationship between the environmental conditions considered by EN 50125-3:2003, the
286 preparatory and additional information reported in Annex A, and the test requirements defined in this document.
287 The structure of Table 1, and also of the informative Annex A, has been deliberately left the same as
288 EN 50125-3:2003, to allow a better readability of the document, even if for some environmental conditions no
289 test requirements have been defined.
290 Table 1 — List of environmental conditions and related test requirements
Preparatory
and
Test requirements subclause
Environmental Subclause in
additional
condition EN 50125-3:2003
in this document
information
in Annex A
Pressure 4.2 A.2 5.2 Insulation tests
Temperature 4.3 A.3 5.3 Temperature tests
Humidity 4.4 A.4 5.4 Humidity test
Wind 4.5 A.5 No test requirements defined in this document
5.4 Humidity test
Rain 4.6 A.6
5.8 Test for protection against water ingress
5.4 Humidity test
Snow and Hail 4.7 A.7
5.11 Test for protection against external
mechanical impacts
Ice 4.8 A.8 5.4 Humidity test
Solar Radiation 4.9 A.9 5.9 Solar radiation tests
5.2 Insulation tests
Lightning 4.10 A.10
5.7 Surge test
5.2 Insulation tests
5.10 Test for protection against dust and sand
Pollution 4.11 A.11 ingress
5.11 Test for protection against external
mechanical impacts
Fire Protection 4.12 A.11 No test requirements defined in this document
Vibrations and
4.13 A.13 5.5 Vibration and shock tests
Shocks
Electromagnetic
4.14 A.14 5.6 Electromagnetic compatibility tests
compatibility
Power supplies 4.15 A.15 No test requirements defined in this document
291 As previously explained, Table 1 relates each environmental condition with the relevant tests requirements
292 defined in this document; this is to allow to the user of this document, considering the environmental conditions
293 to be taken into account, to identify which tests shall be performed to the equipment. Due to this approach and
294 the structure of the Table 1, some test requirements have been repeated on several rows, because the tested
295 characteristics are related to different environmental conditions.
296 To directly identify which tests shall be performed on an equipment for a complete execution of the type tests,
297 in order to take into account all environmental conditions stated in EN 50125-3:2003 for which test requirements
298 have been defined in this document, informative Annex D provides a guide.
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299 5 Test requirements for type test
300 5.1 General test requirements
301 5.1.1 Test levels
302 EN 50125-3:2003 specifies the environmental conditions, with the related severity of environmental parameters,
303 encountered within Europe for railway signalling and telecommunication trackside equipment.
304 The test levels defined in this document are derived from the severity of the environmental parameters defined
305 in EN 50125-3:2003.
306 5.1.2 Standard atmospheric conditions
307 As defined in EN 60068-1:2014, 4.3, the standard range of atmospheric conditions for carrying out
308 measurements and tests are (inclusive values):
Temperature: 15 °C to 35 °C
Relative humidity: from 25 % to 75 %
Air pressure: 86 kPa to 106 kPa
309 These standard atmospheric conditions shall be maintained during the execution of all tests defined in this
310 document, unless specifically defined in the respective basic standard. If it is impracticable to carry out
311 measurements in standard atmospheric conditions, a note stating the actual conditions shall be added to the
312 test report.
313 5.1.3 Performance criteria
314 5.1.3.1 General
315 The expected performance (i.e. the equipment is functioning as specified), from the equipment under test, shall
316 be specified for all operational conditions.
317 No damage to any connected equipment is allowed when the equipment does not operate as intended during
318 or after the test.
319 5.1.3.2 Performance criterion A
320 The EUT shall continue to operate as intended. No change of operational state is allowed. No loss or
321 unintentional change in stored data shall occur.
322 5.1.3.3 Performance criterion B
323 Degradation of the performance below the level described in criterion A is permitted, provided the EUT self-
324 recovers to the condition established prior to the application of the test. No loss of stored data is allowed.
325 5.1.3.4 Performance criterion C
326 Degradation of performance as described in criteria A and B is permitted provided that the EUT self-recovers to
327 the condition established prior to the application of the test within a maximum defined time, or can be restored
328 after the test by the operator.
329 5.1.4 Visual Inspection
330 The visual inspection verifies the mechanical, dimensional and appearance conformance of the equipment,
331 considering the drawings and requirements defined by the manufacturer in its specifications.
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332 5.1.5 Performance test
333 The performance test verifies that the functional requirements of the equipment are met; consists of a
334 comprehensive series of measurements of the functional characteristics to verify that the equipment operates
335 as specified.
336 The performance test shall be well defined in the type test specification.
337 5.2 Insulation tests
338 5.2.1 General
339 The insulation tests herein defined are based on the provision of EN 50124-1:2017.
340 The insulation tests, defined below, verify that the design of the equipment (mounted components, metal
341 connections and enclosures, routing of printed circuit board tracks and wire) meets the requirements for galvanic
342 isolation necessary for proper operation in the railway environment.
343 The tests should be carried out on fully assembled equipment and no alteration of the original settings is
344 permitted (e.g. component removal). If components have to be removed during the tests, that specific test
345 configuration shall be agreed between the involved parties and defined in the type test specification.
346 The manufacturer shall define in the type test specifications the maximum altitude at which the equipment can
347 operate and all ports interfacing the EUT with other equipment or in general with the railway signalling and
348 telecommunication system. For each port shall be defined, in accordance with EN 50124-1:2017:
349 — Nominal voltage U
n
350 — Rated insulation voltage U
Nm
351 — Overvoltage category
352 — Rated impulse voltage U
Ni
353 — Insulation type (see 3.6 of EN 50124-1:2017)
354 In accordance with EN 50124-1:2017, the rated input voltage U shall be corrected with the altitude correction
Ni
355 factor defined in Table A.9 of EN 50124-1:2017. If the insulation type of the port is double or reinforced, the
356 rated impulse voltage shall be 160 % of the rated impulse voltage required for basic insulation.
357 Earth connection, if present, and the enclosure of the equipment shall be considered as ports in order to verify
358 the insulation barrier. For these ports the information written above (U , U , etc.) cannot be defined.
n Nm
359 Ports related to the same equipotential section (see 3.3 of EN 50124-1:2017) shall be considered as a single
360 port for the scope of these tests and all their terminals shall be short-circuited together during all the insulation
361 tests (e.g. metallic enclosure connected to the earth connection, and the earth port shall be considered as a
362 single port).
363 The insulation tests consist in four parts that shall be done in sequence:
364 — Initial insulation resistance test (see 5.2.2)
365 — Impulse test (see 5.2.3)
366 — Voltage withstand test (see 5.2.4)
367 — Final insulation resistance test (see 5.2.2)
368 During the tests the equipment shall be switched OFF. After the insulation tests the equipment shall work as
369 intended and within its specified limits. All measured values shall be recorded in the test report
370 Tests shall be performed for all isolated ports of the EUT in order to verify the isolation with the other ports.
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371 NOTE If the insulation type from the port under test to the other ports is the same (all with basic insulation or all with
372 reinforced insulation), the other ports, which are not subjected to test, can be connected together and to the reference of
373 the test instrument in order to reduce the number of the tests. With this strategy it is possible to verify multiple insulations
374 during the same test.
375 If an equipment has an insulating enclosure, this shall be covered with a metal foil in contact with the insulating
376 surface so that it can be electrically connected for the purpose of the insulation tests.
377 5.2.2 Insulation resistance test
378 5.2.2.1 General
379 The
...