Low-voltage switchgear and controlgear - Part 4-2: Contactors and motor-starters - AC semiconductor motor controllers and starters ( Binational standard with UL 60947-4-2)
This is the harmonized CSA Group and UL standard for Low-voltage switchgear and controlgear – Part 4-2: Contactors and motor-starters – AC semiconductor motor controllers and starters. It is the second edition of CSA C22.2 No. 60947-4-2 and the second edition of UL 60947-4-2. This edition of CSA C22.2 No. 60947-4-2 supersedes the previous edition published in 2014 as CAN/CSA-C22.2 No. 60947-4-2 (adopted IEC 60947-4-2:1999+A1:2001+A2:2006).
This harmonized standard is based on IEC publication 60947-4-2, third edition, Low-voltage switchgear and controlgear – Part 4-2: Contactors and motor-starters – AC semiconductor motor controllers and starters, issued May 2011 as revised by corrigendum 1 issued July 2012. IEC 60947-4-2 is copyrighted by the IEC.
This harmonized standard was prepared by CSA Group and Underwriters Laboratories Inc. (UL). The efforts and support of the Technical Harmonization Committee for Industrial Control Equipment, of the Council on the Harmonization of Electrotechnical Standards of the Nations of the Americas (CANENA), are gratefully acknowledged.
This Standard is considered suitable for use for conformity assessment within the stated scope of the Standard.
This Standard was reviewed by the CSA Integrated Committee on Industrial Controls, under the jurisdiction of the CSA Technical Committee on Industrial Products and the CSA Strategic Steering Committee on Requirements for Electrical Safety, and has been formally approved by the CSA Technical Committee. This standard has been developed in compliance with Standards Council of Canada requirements for National Standards of Canada. It has been published as a National Standard of Canada by CSA Group.
This standard applies to a.c. semiconductor motor controllers and starters, which may include a series mechanical switching device, intended to be connected to circuits, the rated voltage of which does not exceed 1 000 V a.c.
This standard characterizes a.c. semiconductor motor controllers and starters with and without bypass means.
AC semiconductor motor controllers and starters dealt with in this standard are not normally designed to interrupt short-circuit currents. Therefore, suitable short-circuit protection (see 8.2.4) should form part of the installation, but not necessarily of the a.c. semiconductor motor controller or starter.
In this context, this standard gives requirements for a.c. semiconductor motor controllers and starters associated with separate short-circuit protective devices.
This standard does not apply to
– continuous operation of a.c. motors at motor speeds other than the normal speed;
– semiconductor equipment, including semiconductor contactors (see 2.2.13 of IEC 60947-1:2007) controlling non-motor loads;
– electronic a.c. power controllers covered by IEC 60146 series.
Contactors, overload relays and control circuit devices used in a.c. semiconductor motor controllers and starters should comply with the requirements of their relevant product standard. Where mechanical switching devices are used, they should meet the requirements of their own IEC product standard, and the additional requirements of this standard.
The object of this standard is to state as follows:
– the characteristics of a.c. semiconductor motor controllers and starters and associated equipment;
– the conditions with which a.c. semiconductor motor controllers and starters comply with reference to
a) their operation and behaviour;
b) their dielectric properties;
c) the degrees of protection provided by their enclosures where applicable;
d) their construction;
– the tests intended for confirming that these conditions have been met, and the methods to be adopted for these tests;
– the information to be given with the equipment, or in the manufacturer's literature.
NOTE For the purpose of this standard, the term controller may be used instead of a.c. semiconductor motor controller.
1DV D2 Modification of Clause 1 by adding the following:
1DV.1 This equipment is intended for installation in accordance with CSA C22.1, Canadian Electrical Code (CE Code, Part I), and the US National Electrical Code (NEC), NFPA 70.
1DV.2 This standard also applies to combination motor controllers incorporating semiconductor motor controllers and starters. See Annex DVC for specific requirements.
Low-voltage switchgear and controlgear - Part 4-2: Contactors and motor- starters — AC semiconductor motor controllers and starters (Binational standard with UL 60947-4-2)
Appareillage à basse tension — Partie 4-2 : Contacteurs et démarreurs de moteurs — Gradateurs et démarreurs à semiconducteurs de moteurs à courant alternatif (norme binationale avec UL 60947-4-2)