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PD IEC TR 62368-2:2019 Audio/video, information and communication technology equipment - Explanatory information related to IEC 62368-1:2018, 2019
- undefined
- English [Go to Page]
- CONTENTS
- FOREWORD
- INTRODUCTION
- 0 Principles of this product safety standard
- Figures [Go to Page]
- Figure 1 – Risk reduction as given in ISO/IEC Guide 51
- 1 Scope [Go to Page]
- Figure 2 – HBSE Process Chart
- 2 Normative references
- 3 Terms, definitions and abbreviations [Go to Page]
- Figure 3 – Protective bonding conductor as part of a safeguard
- 4 General requirements [Go to Page]
- Figure 4 – Safeguards for protecting an ordinary person
- Figure 5 – Safeguards for protecting an instructed person
- Figure 6 – Safeguards for protecting a skilled person
- Tables [Go to Page]
- Table 1 – General summary of required safeguards
- Figure 7 – Flow chart showing the intent of the glass requirements
- 5 Electrically-caused injury [Go to Page]
- 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)
- 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)
- 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)
- Table 4 – Limit values of accessible capacitance (threshold of pain)
- Table 5 – Total body resistances RT for a current path hand to hand, DC, for large surface areas of contact in dry condition
- Figure 11 – Illustration of working voltage
- Figure 12 – Illustration of transient voltages on paired conductor external circuits
- Figure 13 – Illustration of transient voltages on coaxial-cable external circuits
- Table 6 – Insulation requirements for external circuits
- Figure 14 – Basic and reinforced insulation in Table 14 of IEC 62368-1:2018; ratio reinforced to basic
- Figure 15 – Reinforced clearances according to Rule 1, Rule 2, and Table 14
- Table 7 – Voltage drop across clearance and solid insulation in series
- Figure 16 – Example illustrating accessible internal wiring
- Figure 17 – Waveform on insulation without surge suppressors and no breakdown
- 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
- Figure 21 – Example for an ES2 source
- Figure 22 – Example for an ES3 source
- Figure 23 – Overview of protective conductors
- Figure 24 – Example of a typical touch current measuring network
- Figure 25 – Touch current from a floating circuit
- Figure 26 – Touch current from an earthed circuit
- Figure 27 – Summation of touch currents in a PABX
- 6 Electrically-caused fire [Go to Page]
- Figure 28 – Possible safeguards against electrically-caused fire
- Table 8 – Examples of application of various safeguards
- Figure 29 – Fire clause flow chart
- Table 9 – Basic safeguards against fire under normal operating conditions and abnormal operating conditions
- Table 10 – Supplementary safeguards against fire under single fault conditions
- Table 11 – Method 1: Reduce the likelihood of ignition
- Figure 30 – Prevent ignition flow chart
- Figure 31 – Control fire spread summary
- Figure 32 – Control fire spread PS2
- Figure 33 – Control fire spread PS3
- Table 12 – Method 2: Control fire spread
- Figure 34 – Fire cone application to a large component
- Table 13 – Fire barrier and fire enclosure flammability requirements
- Table 14 – Summary – Fire enclosure and fire barrier material requirements
- 7 Injury caused by hazardous substances [Go to Page]
- Table 15 – Control of chemical hazards
- Figure 35 – Flowchart demonstrating the hierarchy of hazard management
- 8 Mechanically-caused injury [Go to Page]
- Figure 36 – Model for chemical injury
- Figure 37 – Direction of forces to be applied
- 9 Thermal burn injury [Go to Page]
- Figure 38 – Model for a burn injury
- Figure 39 – Model for safeguards against thermal burn injury
- 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
- 10 Radiation [Go to Page]
- Figure 43 – Flowchart for evaluation of Image projectors (beamers)
- Figure 44 – Graphical representation of LAeq,T
- Table 16 – Overview of requirements for dose-based systems
- Annexes [Go to Page]
- 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
- Figure 45 – Overview of operating modes
- Annex C UV Radiation
- Annex D Test generators
- Annex E Test conditions for equipment containing audio amplifiers
- Annex F Equipment markings, instructions, and instructional safeguards
- Annex G Components
- Figure 46 – Voltage-current characteristics (Typical data)
- Figure 47 – Example of IC current limiter circuit
- Annex H Criteria for telephone ringing signals
- Figure 48 – Current limit curves
- Annex J Insulated winding wires for use without interleaved insulation
- Annex K Safety interlocks
- Annex L Disconnect devices
- Annex M Equipment containing batteries and their protection circuits
- Table 17 – Safety of batteries and their cells – requirements (expanded information on documents and scope)
- Figure 49 – Example of a dummy battery circuit
- Annex O Measurement of creepage distances and clearances
- Annex P Safeguards against conductive objects
- Annex Q Circuits intended for interconnection with building wiring
- 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
- Annex T Mechanical strength tests
- Annex U Mechanical strength of CRTs and protection against the effects of implosion
- Annex V Determination of accessible parts
- 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
- Annex A (informative) Background information related to the use of SPDs
- 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)
- 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)
- Figure A.5 – Safeguards
- Figure A.6 – Discharge stages
- Figure A.7 – Holdover
- Figure A.8 – Discharge
- Figure A.9 – Characteristics
- Figure A.10 – Follow on current pictures
- 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
- Figure B.2 – 100 MΩ oscilloscope probes
- Table B.1 – 100 MΩ oscilloscope probes
- Table B.2 – Capacitor discharge
- Figure B.3 – Combinations of EUT resistance and capacitance for 1 s time constant
- Figure B.4 – 240 V mains followed by capacitor discharge
- Figure B.5 – Time constant measurement schematic
- Table B.3 – Maximum Tmeasured values for combinations of REUT and CEUT for TEUT of 1 s
- Figure B.6 – Worst-case measured time constant values for 100 MΩ and 10 MΩ probes
- Annex C (informative) Background information related to resistance to candle flame ignition
- Bibliography [Go to Page]