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BSI PD IEC TR 62368-2:2019

BSI PD IEC TR 62368-2:2019

$215.11

Audio/video, information and communication technology equipment – Explanatory information related to IEC 62368-1:2018

Published By Publication Date Number of Pages
BSI 2019 198
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Purpose: To identify the purpose and applicability of this document and the exclusions from the scope.

Rationale: The scope excludes requirements for functional safety. Functional safety is addressed in IEC 61508-1. Because the scope includes computers that may control safety systems, functional safety requirements would necessarily include requirements for computer processes and software.

The requirements provided in IEC 60950-23 could be modified and added to IEC 62368 as another –X document. However, because of the hazardbased nature of IEC 62368-1, the requirements from IEC 60950-23 have been incorporated into the body of IEC 62368-1 and made more generic.

The intent of the addition of the IEC 60950-23 requirements is to maintain the overall intent of the technical requirements from IEC 60950-23, incorporate them into IEC 62368-1 following the overall format of IEC 62368-1 and simplify and facilitate the application of these requirements.

Robots traditionally are covered under the scopes of ISO documents, typically maintained by ISO TC 299. ISO TC 299 has working groups for personal care robots and service robots, and produces for example, ISO 13482, Robots and robotic devices – Safety requirements for personal care robots.

PDF Catalog

PDF Pages PDF Title
2 undefined
4 English
CONTENTS
8 FOREWORD
11 INTRODUCTION
12 0 Principles of this product safety standard
13 Figures
Figure 1 – Risk reduction as given in ISO/IEC Guide 51
14 1 Scope
Figure 2 – HBSE Process Chart
15 2 Normative references
3 Terms, definitions and abbreviations
17 Figure 3 – Protective bonding conductor as part of a safeguard
18 4 General requirements
21 Figure 4 – Safeguards for protecting an ordinary person
Figure 5 – Safeguards for protecting an instructed person
22 Figure 6 – Safeguards for protecting a skilled person
Tables
Table 1 – General summary of required safeguards
24 Figure 7 – Flow chart showing the intent of the glass requirements
25 5 Electrically-caused injury
27 Figure 8 – Conventional time/current zones of effects of AC currents (15 Hz to 100 Hz) on persons for a current path correspondingto left hand to feet (see IEC TS 60479-1:2005, Figure 20)
28 Figure 9 – Conventional time/current zones of effects of DC currents on persons for a longitudinal upward current path (see IEC TS 60479-1:2005, Figure 22)
Table 2 – Time/current zones for AC 15 Hz to 100 Hz for hand to feet pathway (see IEC TS 60479-1:2005, Table 11)
29 Figure 10 – Illustration that limits depend on both voltage and current
Table 3 – Time/current zones for DC for hand to feet pathway (see IEC TS 60479-1:2005, Table 13)
32 Table 4 – Limit values of accessible capacitance (threshold of pain)
34 Table 5 – Total body resistances RT for a current path hand to hand, DC, for large surface areas of contact in dry condition
41 Figure 11 – Illustration of working voltage
43 Figure 12 – Illustration of transient voltages on paired conductor external circuits
44 Figure 13 – Illustration of transient voltages on coaxial-cable external circuits
Table 6 – Insulation requirements for external circuits
45 Figure 14 – Basic and reinforced insulation in Table 14 of IEC 62368-1:2018; ratio reinforced to basic
47 Figure 15 – Reinforced clearances according to Rule 1, Rule 2, and Table 14
49 Table 7 – Voltage drop across clearance and solid insulation in series
55 Figure 16 – Example illustrating accessible internal wiring
58 Figure 17 – Waveform on insulation without surge suppressors and no breakdown
59 Figure 18 – Waveforms on insulation during breakdown without surge suppressors
Figure 19 – Waveforms on insulation with surge suppressors in operation
Figure 20 – Waveform on short-circuited surge suppressor and insulation
61 Figure 21 – Example for an ES2 source
Figure 22 – Example for an ES3 source
63 Figure 23 – Overview of protective conductors
66 Figure 24 – Example of a typical touch current measuring network
68 Figure 25 – Touch current from a floating circuit
69 Figure 26 – Touch current from an earthed circuit
Figure 27 – Summation of touch currents in a PABX
72 6 Electrically-caused fire
77 Figure 28 – Possible safeguards against electrically-caused fire
79 Table 8 – Examples of application of various safeguards
80 Figure 29 – Fire clause flow chart
81 Table 9 – Basic safeguards against fire under normal operating conditions and abnormal operating conditions
82 Table 10 – Supplementary safeguards against fire under single fault conditions
84 Table 11 – Method 1: Reduce the likelihood of ignition
85 Figure 30 – Prevent ignition flow chart
87 Figure 31 – Control fire spread summary
88 Figure 32 – Control fire spread PS2
89 Figure 33 – Control fire spread PS3
93 Table 12 – Method 2: Control fire spread
98 Figure 34 – Fire cone application to a large component
100 Table 13 – Fire barrier and fire enclosure flammability requirements
104 Table 14 – Summary – Fire enclosure and fire barrier material requirements
107 7 Injury caused by hazardous substances
109 Table 15 – Control of chemical hazards
110 Figure 35 – Flowchart demonstrating the hierarchy of hazard management
111 8 Mechanically-caused injury
Figure 36 – Model for chemical injury
116 Figure 37 – Direction of forces to be applied
119 9 Thermal burn injury
Figure 38 – Model for a burn injury
121 Figure 39 – Model for safeguards against thermal burn injury
122 Figure 40 – Model for absence of a thermal hazard
Figure 41 – Model for presence of a thermal hazard with a physical safeguard in place
Figure 42 – Model for presence of a thermal hazard with behavioural safeguard in place
128 10 Radiation
130 Figure 43 – Flowchart for evaluation of Image projectors (beamers)
132 Figure 44 – Graphical representation of LAeq,T
134 Table 16 – Overview of requirements for dose-based systems
135 Annexes
Annex A Examples of equipment within the scope of this standard
Annex B Normal operating condition tests, abnormal operating condition tests and single fault condition tests
137 Figure 45 – Overview of operating modes
138 Annex C UV Radiation
Annex D Test generators
139 Annex E Test conditions for equipment containing audio amplifiers
Annex F Equipment markings, instructions, and instructional safeguards
140 Annex G Components
142 Figure 46 – Voltage-current characteristics (Typical data)
146 Figure 47 – Example of IC current limiter circuit
148 Annex H Criteria for telephone ringing signals
149 Figure 48 – Current limit curves
150 Annex J Insulated winding wires for use without interleaved insulation
Annex K Safety interlocks
Annex L Disconnect devices
151 Annex M Equipment containing batteries and their protection circuits
153 Table 17 – Safety of batteries and their cells – requirements (expanded information on documents and scope)
159 Figure 49 – Example of a dummy battery circuit
160 Annex O Measurement of creepage distances and clearances
Annex P Safeguards against conductive objects
161 Annex Q Circuits intended for interconnection with building wiring
162 Annex R Limited short-circuit test
Annex S Tests for resistance to heat and fire
Figure 50 – Example of a circuit with two power sources
164 Annex T Mechanical strength tests
165 Annex U Mechanical strength of CRTs and protection against the effects of implosion
Annex V Determination of accessible parts
166 Annex X Alternative method for determing clearances for insulation in circuits connected to an AC mains not exceeding 420 V peak (300 V RMS)
Annex Y Construction requirements for outdoor enclosures
169 Annex A (informative) Background information related to the use of SPDs
170 Figure A.1 – Installation has poor earthing and bonding; equipment damaged (from ITUT K.66)
Figure A.2 – Installation has poor earthing and bonding; using main earth bar for protection against lightning strike (from ITU-T K.66)
171 Figure A.3 – Installation with poor earthing and bonding, using a varistor and a GDT for protection against a lightning strike
Figure A.4 – Installation with poor earthing and bonding; equipment damaged (TV set)
172 Figure A.5 – Safeguards
176 Figure A.6 – Discharge stages
177 Figure A.7 – Holdover
178 Figure A.8 – Discharge
179 Figure A.9 – Characteristics
180 Figure A.10 – Follow on current pictures
182 Annex B (informative) Background information related to measurement of discharges – Determining the R-C discharge time constant for X- and Y-capacitors
Figure B.1 – Typical EMC filter schematic
184 Figure B.2 – 100 MΩ oscilloscope probes
Table B.1 – 100 MΩ oscilloscope probes
185 Table B.2 – Capacitor discharge
186 Figure B.3 – Combinations of EUT resistance and capacitance for 1 s time constant
188 Figure B.4 – 240 V mains followed by capacitor discharge
189 Figure B.5 – Time constant measurement schematic
192 Table B.3 – Maximum Tmeasured values for combinations of REUT and CEUT for TEUT of 1 s
193 Figure B.6 – Worst-case measured time constant values for 100 MΩ and 10 MΩ probes
194 Annex C (informative) Background information related to resistance to candle flame ignition
195 Bibliography

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BSI PD IEC TR 62368-2:2019
$215.11