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NEMA PB 2.2-2014
Application Guide for Ground Fault Protective Devices for Equipment
Contains instructions for the safe and proper application of GFP devices. GFP devices include current-sensing devices, relaying equipment or combinations of current-sensing devices and relaying equipment or other equivalent protective equipment that will operate to cause a disconnecting means to open all ungrounded conductors at predetermined values of ground-fault current and time.
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NEMA: National Electrical Manufacturers Association [nema]