IEC 60947-3-2020 pdf free download – Low-voltage switchgear and controlgear – Part 3: Switches, disconnectors, switch-disconnectors and fuse-combination units.
This part of lEC 60947 applies to switches，disconnectors,switch-disconnectors and fuse-combination units and their dedicated accessories to be used in distribution circuits and motorcircuits of which the rated voltage does not exceed 1 000 v AC or 1 500 v DC.
NOTE 1 Accessories are interconnecting units，extended terminals，internal coils, auxiliary contacts，motoroperator, etc. offered as options with the basic unit.
This document does not apply to equipment coming within the scope of lEC 60947-2, IEC 60947-4-1 and lEC 60947-5-1.
Particular requirements for switches,disconnectors，switch-disconnectors _and fuse-combination units for use in photovoltaic(PV) DC applications are given in Annex D.
Specific requirements for LV switchgear intended for the connections of aluminium conductorsare given in Annex E.
Guidance on measurement of power loss is provided in Annex F.
This document does not include the additional requirements necessary for electricalapparatus for explosive gas atmospheres.
NOTE 2 Depending on its design, a switch (or disconnector) can be referred to as “a rotary switch(disconnector)” , “cam-operated switch (disconnector)” , “knife-switch (disconnector)” , etc.
NOTE 3 ln this document,the word “switch” also applies to the apparatus referred to in French as”commutateurs”, intended to modify the connections between several circuits and inter alia to substitute a part of acircuit for another.
NOTE4 ln general, throughout this document,switches,disconnectors，switch-disconnectors and fuse-combination units will be referred to as “equipment”.
The object of this document is to state:a) the characteristics of the equipment;
b) the conditions that apply to the equipment with reference to:
1) operation and behaviour in normal service;
2) operation and behaviour in case of specified abnormal conditions, e.g.short-circuit;
3) dielectric properties;
c) the tests for confirming that these conditions have been met and the methods that areadopted for these tests;
d) the information relevant to the marking of the equipment or made available by the
manufacturer, e.g. in the catalogue.
Specific items requiring agreement between the user and the manufacturer are identified inAnnex B.
2Normative references
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 60050-441,International Electrotechnical Vocabulary – Part 441:Switchgear,controlgearand fuses (available at http://www.electropedia.org)
IEC 60034-12:2016，Rotating electrical machines – Part 12: Starting performance of single-speed three-phase cage induction motors
IEC 60034-30-1:2014，Rotating electrical machines – Part 30-1: Efficiency classes of lineoperated AC motors (lE code)
IEC 60228:2004,conductors of insulated cableIEC 60269(all parts),Low-voltage fuses
IEC 60417,Graphical symbols for use on equipment(available at http://www.graphical-symbols.infolequipment)
iEC 60695-2-11:2014,Fire hazard testing – Part 2-11: Glowing/hot-wire based test methods -Glow-wire flammability test method for end-products (GWEPT)
iEC 60947-1:2020,Low-voltage switchgear and controlgear – Part 1: General rules
IEC 60947-5-1:2016，Low-voltage switchgear and controlgear – Part 5-1: Control circuitdevices and switching elements – Electromechanical control circuit devices
IEC 61000-4-2:2008, Electromagnetic compatibility(EMC) – Part 4-2: Testing andmeasurement techniques – Electrostatic discharge immunity test
IEC 61000-4-3:2006,Electromagnetic compatibility(EMC) – Part 4-3: Testing andmeasurement techniques – Radiated,radio-frequency,electromagnetic field immunity testIEC61000-4-3:2006/AMD1:2007
IEC 61000-4-3:2006IAMD2:2010
IEC 61000-4-4:2012, Electromagnetic compatibility(EMC) – Part 4-4: Testing andmeasurement techniques – Electrical fast transient/burst immunity test
IEC 61000-4-5:2014,Electromagnetic compatibility(EMC) – Part 4-5: Testing andmeasurement techniques – surge immunity test
IEC61000-4-5:2014/AMD1:2017
IEC 61 545:1 996, Connecting devices – Devices for the connection of aluminium conductors in clamping units of any material and copper conductors in aluminium bodied clamping units
IEC 62208:201 1 , Empty enclosures for low-voltage switchgear and controlgear assemblies – General requirements.IEC 60947-3 pdf download.