02087nam 2200373 450 991020933550332120231206165728.01-5044-3993-710.1109/IEEESTD.2017.7932209(CKB)3710000001403075(NjHacI)993710000001403075(EXLCZ)99371000000140307520231206d2017 uy 0engur|||||||||||txtrdacontentcrdamediacrrdacarrierIEEE Std C37.21-2017 (Revision of IEEE Std C37.21-2005) IEEE Standard for Control Switchboards /Institute of Electrical and Electronics EngineersNew York, NY, USA :IEEE,2017.1 online resource (34 pages)Ratings, construction, and testing of dead-front control switchboards containing, but not limited to, devices such as switches, control devices, instrumentation, metering, monitoring, alarms, annunciators, protective and auxiliary relays, and regulating devices and accessories are covered in this standard. It includes, but is not specifically limited to, switchboards for the control and protection of apparatus used for or associated with power generation, conversion, transmission, and distribution. Types of switchboards may include control, vertical, dead-front, enclosed, dual, or duplex switchboards. Other construction types include control desks, consoles, benchboards, dual or duplex benchboards, fixed rack, cabinet, and swing rack cabinets. It does not apply to industrial controls, communication equipment, switchboards for use on board ships, or Class 1E switchboards for use in nuclear generating stations.IEEE Std C37.21-2017 Electric switchgearElectric contactsElectric switchgear.Electric contacts.621.3173NjHacINjHaclDOCUMENT9910209335503321IEEE Std C37.21-2017 (Revision of IEEE Std C37.21-2005)3646558UNINA