IEEE C37.20.4-2013

This standard covers indoor ac switches rated above 1 kV through 38 kV for use in metal-enclosed switchgear as follows: a) Stationary or drawout b) Manual or power operation c) Fused or unfused The term ''indoor'' is intended to indicate that the enclosure provides a degree of protection to the switch and the enclosure may be suitable for indoor, outdoor, or other service conditions and complies with the requirements of switchgear assemblies as defined by IEEE Std C37.20.2TM or IEEE Std C37.20.3TM.1 This standard does not apply to switches for use in subsurface or pad-mounted switchgear in IEEE Std C37.74TM or to high-voltage air switches in IEEE Std C37.30TM. Within this standard, the words "switch(es)" shall be considered to mean metal-enclosed, indoor, three-phase, ac medium-voltage switch(es) as defined by this scope. There are switch designs that have short-circuit current interrupting capability, and these devices are covered by this standard only to the extent of meeting the listed testing requirements. However, due to the additional capability, additional testing is required and the manufacturers should be consulted.

The purpose of this standard is to provide the usual service conditions, definition of ratings, preferred ratings, design and production tests, construction requirements, and an application guide for the switches covered by this standard. This standard is based on criteria stated in IEEE Std C37.30TM, ANSI C37.22-1997 [B1],2 IEEE Std C37.34TM, and IEEE Std 1247-2005.

Revision Standard - Inactive-Reserved. Indoor ac medium-voltage switches for use in enclosures for application in power circuits at voltages above 1 kV through 38 kV are covered in this standard. Stationary or drawout, manual or power operation, and fused or unfused are included.