ANSI Relay Standards

The purpose of this recommended practice is to provide information on surge voltages in low-voltage (Footnote 1) ac power circuits. With this information, equipment designers and users can evaluate their operating environment to determine their need for surge-protective devices. The document...

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These requirements cover automatic, non-automatic, and manual transfer switches, operating at voltages of greater than 1000 Vac, and intended for use in non-hazardous locations in accordance with Annex B, Item 1, the National Electrical Code, ANSI/NFPA 70, or the Canadian Electrical Code,...

Products covered This standard applies to motor control centres to be used in accordance with the U.S. National Electrical Code, ANSI/NFPA 70, the Canadian Electrical Code, Part I, CSA C22.1, and the Mexican Electrical Installations (Utility), NOM-001-SEDE. These requirements cover motor...

This part of IEC 60255 specifies minimum requirements for over/under voltage relays. The standard includes specification of the protection function, measurement characteristics and time delay characteristics. This part of IEC 60255 specifies defines the influencing factors that affect the...