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Purpose: To identify the purpose and applicability of this standard 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.

PDF Catalog

PDF Pages	PDF Title
4	FOREWORD
6	Clause 0 Principles of this product safety standard
7	Clause 1 Scope Clause 2 Normative references Clause 3 Terms, definitions and abbreviations
9	Clause 4 General requirements
13	Tables Table 1 – General summary of required safeguards
15	Clause 5 Electrically-caused injury
17	Figures Figure 1 – Conventional time/current zones of effects of a.c. currents (15 Hz to 100 Hz) on persons for a current path corresponding to left hand to feet (see IEC TS 60479-1:2005, Figure 20)
18	Figure 2 – Conventional time/current zones of effects of d.c. currents on personsfor a longitudinal upward current path (see IEC TS 60479-1:2005, Figure 22) Table 2 – Time/current zones for a.c. 15 Hz to 100 Hzfor hand to feet pathway (see IEC TS 60479-1:2005, Table 11)
19	Figure 3 – Illustration that limits depend on both voltage and current Table 3 – Time/current zones for d.c. for hand to feet pathway(see IEC TS 60479-1:2005, Table 13)
21	Table 4 – Limit values of accessible capacitance (threshold of pain)
23	Table 5 – Total body resistances RT for a current path hand to hand, d.c.,for large surface areas of contact in dry condition
31	Figure 4 – Illustration of transient voltages on paired conductor external circuits
32	Figure 5 – Illustration of transient voltages on coaxial-cable external circuits Table 6 – Insulation requirements for external circuits
33	Figure 6 – Basic and reinforced insulation in Table 15 of IEC 62368-1:2014 –Ratio reinforced to basic
35	Figure 7 – Reinforced clearances according to Rule 1, Rule 2, and Table 15
36	Table 7 – Voltage drop across clearance and solid insulation in series
42	Figure 8 – Example illustrating accessible internal wiring
44	Figure 9 – Waveform on insulation without surgesuppressors and no breakdown Figure 10 – Waveforms on insulation during breakdownwithout surge suppressors
45	Figure 11 – Waveforms on insulation withsurge suppressors in operation Figure 12 – Waveform on short-circuitedsurge suppressor and insulation
46	Figure 13 – Example for an ES2 source
47	Figure 14 – Example for an ES3 source
49	Figure 15 – Overview of protective conductors
53	Figure 17 – Touch current from a floating circuit Figure 18 – Touch current from an earthed circuit
54	Figure 19 – Summation of touch currents in a PABX
55	Clause 6 Electrically-caused fire
59	Figure 20 – Possible safeguards against electrically-caused fire
61	Table 8 – Examples of application of various safeguards
62	Figure 21 – Fire clause flow chart
63	Table 9 – Basic safeguards against fire under normal operating conditionsand abnormal operating conditions
64	Table 10 – Supplementary safeguards against fire under single fault conditions
65	Table 11 – Method 1: Reduce the likelihood of ignition
66	Figure 22 – Prevent ignition flow chart
68	Figure 23 – Control fire spread summary
69	Figure 24 – Control fire spread PS2
70	Figure 25 – Control fire spread PS3
73	Table 12 – Method 2: Control fire spread
78	Figure 26 – Fire cone application to large component
80	Table 13 – Fire barrier and fire enclosure flammability requirements
83	Table 14 – Summary – Fire enclosure and fire barrier material requirements
85	Clause 7 Injury caused by hazardous substances
87	Table 15 – Control of chemical hazards
88	Figure 27 – Flowchart demonstrating the hierarchy of hazard management
89	Clause 8 Mechanically-caused injury Figure 28 – Model for chemical injury
94	Figure 29 – Direction of forces to be applied
97	Clause 9 Thermal burn injury Figure 30 – Model for a burn injury
99	Figure 31 – Model for safeguards against thermal burn injury Figure 32 – Model for absence of a thermal hazard Figure 33 – Model for presence of a thermal hazard with a physical safeguard in place
100	Figure 34 – Model for presence of a thermal hazard with behavioural safeguard in place
104	Clause 10 Radiation Table 16 – Protection against radiation
106	Figure 35 – Graphical representation of LAeq,T
107	Figure 36 – Overview of operating modes
111	Figure 37 – Voltage-current characteristics (typical data)
116	Figure 38 – Current limit curves
119	Figure 39 – Example of a dummy battery circuit
122	Figure 40 – Example of a circuit with two power sources
126	Annex A(informative) Background information related to the use of SPDs
127	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)
128	Figure A.3 – Installation with poor earthing and bonding, using a varistorand a GDT for protection against a lightning strike Figure A.4 – Installation with poor earthing and bonding – Equipment damaged (TV set)
129	Figure A.5 – Safeguards
132	Figure A.6 – Discharge stages
133	Figure A.7 – holdover
134	Figure A.8 – Discharge
136	Figure A.9 – Characteristics
137	Figure A.10 – Follow on current pictures
138	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
140	Figure B.2 – 100 MΩ oscilloscope probes Table B.1 – 100 MΩ oscilloscope probes Table B.2 – Capacitor discharge
142	Figure B.3 – Combinations of EUT resistance and capacitancefor 1-s time constant
143	Figure B.4 – 240 V mains followed by capacitor discharge
144	Figure B.5 – Time constant measurement schematic
147	Table B.3 – Maximum Tmeasured values for combinationsof REUT and CEUT for TEUT of 1 s
148	Figure B.6 – Worst-case measured time constant values for 100 MΩ and 10 MΩ probes
149	Annex C (informative) Background information related to resistance to candle flame ignition
150	Bibliography

Published By	Publication Date	Number of Pages
BSI	2015	154


PDF Format	Searchable	Printable	Preview Now

Status	Withdrawn
Title	Audio/video, information and communication technology equipment – Explanatory information related to IEC 62368-1
Replaces	PD IEC/TR 62368-2:2011
Publisher	BSI
Committee	EPL/108
Pages	154
Publication Date	2015-02-20
Withdrawn Date	2019-06-18
Replaced By	PD IEC TR 62368-2:2019
ISBN	978 0 580 86068 3
Standard Number	PD IEC/TR 62368-2:2015
Identical National Standard Of	IEC TR 62368-2:2015
Descriptors	Safety measures, Communication equipment, Hazards, Audio equipment, Data processing, Fire safety, Computers, Electrical safety, Video recording, Television equipment, Electrical components, Electronic equipment and components
ICS Codes	33.160.01 - Audio, video and audiovisual systems in general