IEC 62368-3-2018 pdf free download

IEC 62368-3-2018 pdf free download.Audio/video, information and communication technology equipment
Part 3: Safety aspects for DC power transfer through communication cables and ports.
The following documents are referred to in the text in such a way that some or all of theircontent constitutes requirements of this document. For dated references，only the editioncited applies. For undated references, the latest edition of the referenced document (includingany amendments) applies.
IEC 62368-1:2014，Audio/video，information and communication technology equipment -Part 1 : Safety requirements
IEC Guide 104,The preparation of safety publications and the use of basic safety publicationsand group safety publications
3Terms, definitions and abbreviated terms3.1 Terms and definitions
For the purposes of this document,the terms and definitions given in lEC 62368-1:2014 andthe following apply.
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3.1.1 power sourcing equipmentPSE
equipment,other than dedicated external power supply units intended to supply specificequipment within the scope of lEC 62368-1,supplying DC power to other equipment throughcommunication cables or ports
Note 1 to entry: lt should be noted that the IEEE 802.3-2015 standard has a similar but different definition.Note 2 to entry: This note applies to the French language only.
3.1.2 powered devicePD
equipment supplied DC power by a PSE through communication cables or ports
4General requirements
For equipment serving as a PD or a PSE using voltages at ES1 or ES2, the requirements ofClause 5 apply. However，Clause 5 does not apply to equipment used as PSE or PD withproprietary connectors or where a proprietary protocol is used to enable the power transfer.
NOTEA proprietary connector is a connector not used in an industry standard and which is under the control ofone manufacturer.
For equipment serving as a PD or a PSE using RFT, the requirements of Clause 6 apply.
5 Power transfer using ES1 or ES2 voltages
5.1General requirements
The maximum rated output voltage of the PSE under normal operating conditions shall notexceed the rated limits of the intended communication systems power source functionalspecifications under conditions of no load, normal load,and maximum rated load.
NOTE 1 For USB 2.0 and 3.1, the limits are 5,25 V.For a USB battery charger, the limit is 6 V.USB powerdelivery can be rated up to 20 v max.
NOTE 2 Other ES1 and ES2 DC power transfer systems are under investigation.
Where a PD or PSE have the capability to both provide power and receive power， all therequirements from 5.1 to 5.4 shall apply for each mode as applicable.
NOTE3 Equipment can have multiple ports serving different PSE and PD roles simultaneously in any combination.5.2Electrical-caused injury, electrical sources and safeguards
The requirements of Clause 5 of IEC 62368-1:2014 apply for a PSE classified as ES1 andES2.
5.3Electrical-caused fire, power sources and safeguards
5.3.1DC power transfer interconnection to building wiring
To protect the communication cables，including building wiring,and other devices includingthe PD, the PSE shall implement power limiting control to reduce the likelihood of ignition andshall limit the output current to a value that does not cause damage to the wiring system.
To reduce the likelihood of ignition, the PSE circuit that provides power shall comply with therequirements for a limited power source (LPS) of Clause Q.1 of lEC 623681:2014.
NOTE1 This means that a fire enclosure is not normally required in the power feeding load circuits of the PD.For interconnection of PSE circuits to other devices for DC power transfer via building wiring,where it is unknown whether remotely attached devices comply with this document, the PSEshall limit the output current to a value that does not cause damage to the wiring system dueto overheating，under any conditions of external load up to and including short circuits. Themaximum continuous current from the equipment shail not exceed a current limit that issuitable for the minimum wire gauge specified in the equipment installation instructions.
For a PD that receives multiple power input circuits from one or more PSE, the PD also shallimplement power limiting in accordance with PS2 or Annex Q of lEC 62368-1:2014 to controladditive power from returning to another PSE under normal operating conditions, abnormaloperating conditions and single fault conditions.IEC 62368-3 pdf free download.