IEC 60947-3-2015 pdf download.Low-voltage switchgear and controlgear – Part 3: Switches, disconnectors, switch-disconnectors and fuse-combination units.
The provisions of the general rules dealt with in IEC 60947-1 are applicable to this part, where specifically called for. Clauses and subclauses, tables, figures and appendices of the general rules thus applicable are identified by reference IEC 60947-1 , e.g., 4.3.4.1 of IEC 60947-1 ,
Table 4 of IEC 60947-1 , or Annex A of IEC 60947-1 .
1.1 Scope and object
This part of IEC 60947 applies to switches, disconnectors, switch-disconnectors and fuse- combination units to be used in distribution circuits and motor circuits of which the rated voltage does not exceed 1 000 V a.c. or 1 500 V d.c.
The manufacturer shall specify the type, ratings and characteristics according to the relevant standard of any incorporated fuses.
This part does not apply to equipment coming within the scope of IEC 60947-2, IEC 60947-4-1 and IEC 60947-5-1 ; however, when switches and fuse-combination units coming into the scope of this part are normally used to start, accelerate and/or stop an individual motor they shall also comply with the additional requirements given in Annex A.
The requirements for single pole operated three pole switches are included in Annex C.
Auxiliary switches fitted to equipment within the scope of this part shall comply with the requirements of IEC 60947-5-1 .
This part does not include the additional requirements necessary for electrical apparatus for explosive gas atmospheres.
NOTE 1 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 2 In this part, 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 a circuit for another.
NOTE 3 In general, throughout this part switches, disconnectors, switch-disconnectors and fuse-combination units will be referred to as “equipment”.
The object of this part is to state
a) the characteristics of the equipment;
b) the conditions with which the equipment shall comply 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 to be adopted for these tests;
d) the information to be marked on the equipment or made available by the manufacturer, e.g. in the catalogue.
1.2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
IEC 60050-441 :1 984, International Electrotechnical Vocabulary (IEV) – Chapter 441: Switchgear, controlgear and fuses
IEC 60050-441 :1 984/AMD1 :2000
IEC 60269 (all parts), Low-voltage fuses
IEC 6041 0:1 973, Sampling plans and procedures for inspection by attributes
IEC 6041 7-DB:2000 2002 1 , Graphical symbols for use on equipment
IEC 60947-1 :2007, Low-voltage switchgear and controlgear – Part 1: General rules
IEC 60947-1 :2007/AMD1 :201 0
IEC 60947-1 :2007/AMD2:201 4
IEC 60947-2:2006, Low-voltage switchgear and controlgear – Part 2: Circuit-breakers
IEC 60947-2:2006/AMD1 :2009
IEC 60947-2:2006/AMD2:201 3
IEC 60947-4-1 :2000 2009, Low-voltage switchgear and controlgear – Part 4-1: Contactors and motor-starters – Electromechanical contactors and motor-starters.IEC 60947-3 pdf download.