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UL 1053 - UL STANDARD FOR SAFETY GROUND-FAULT SENSING AND RELAYING EQUIPMENT - SEVENTH EDITION; REPRINT WITH REVISIONS THROUGH AND INCLUDING NOVEMBER 19, 2015 Organization: UL
Date: 2015-08-05
Description: These requirements cover ground-fault current sensing devices, relaying equipment, or combinations of ground-fault current sensing devices and relaying equipment or equivalent protection equipment for use in ordinary locations that will operate to cause a disconnecting device to open all ungrounded conductors at predetermined values of ground-fault current, in accordance with the National Electrical Code, ANSI/NFPA 70.
UL 1008A OUTLINE - OUTLINE OF INVESTIGATION FOR TRANSFER SWITCH EQUIPMENT, OVER 600 VOLTS - ISSUE 1 Organization: UL
Date: 2006-08-02
Description: These requirements cover transfer switches together with their associated control devices including voltage sensing relays, frequency sensing relays, time delay relays, and the like. An automatic transfer switch as covered by these requirements is a device that automatically transfers a common load from a normal supply to an alternate supply in the event of failure of the normal supply, and automatically returns the load to the normal supply when the normal supply is restored.
NECA NEIS 700 - STANDARD FOR INSTALLING OVERCURRENT PROTECTION TO ACHIEVE SELECTIVE COORDINATION Organization: NECA
Date: 2010-01-01
Description: It applies to: a) Devices rated 600 V and less b) Fuses c) Circuit breakers Products and Applications Excluded This standard does not apply to: a) Overcurrent protective devices rated more than 600 V b) Protective relays c) Protection of conductors, transformers, motors or other equipment Regulatory and Other Requirements a) All information in this publication is intended to conform to the National Electrical CodeĀ® (ANSI/NFPA Standard 70).
UL 1996 - UL STANDARD FOR SAFETY ELECTRIC DUCT HEATERS - FOURTH EDITION; REPRINT WITH REVISIONS THROUGH AND INCLUDING JULY 15, 2016 Organization: UL
Date: 2009-08-31
Description: Duct heaters designed to be connected to air-duct systems are intended for installation in accordance with the Standard for the Installation of Air Conditioning and Ventilating Systems, NFPA 90A, and the Standard for the Installation of Warm Air Heating and Air Conditioning Systems, NFPA 90B. These requirements apply to relays and other auxiliary control devices that may be provided as part of a duct heater to make it usable with other heating or cooling equipment, and are intended to take into account the effects of operating the duct heater in conjunction with or in proximity to such equipment.

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