BSI PD IEC/TR 62368-2:2015
$215.11
Audio/video, information and communication technology equipment – Explanatory information related to IEC 62368-1
| Published By | Publication Date | Number of Pages |
| BSI | 2015 | 154 |
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 |
