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News

Application guide for Ground Fault Protective Devices for Equipment

National Electrical Manufacturers Association (NEMA) : 12 March, 2015  (Company News)
The National Electrical Manufacturers Association (NEMA) published NEMA PB 2.2-2014 Application Guide for Ground Fault Protective Devices for Equipment.
GFP devices are designed to be used primarily on solidly grounded distribution systems rated up to a maximum of 600VAC to provide for rapid clearing of ground faults. The National Electrical Code (NEC) requires ground fault protection in certain instances. In other situations, ground fault protection is added at the request of the customer. 
 
GFP devices include current sensing devices (GFS), relaying equipment (GFR), combinations of GFS and GFR 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. They are intended to protect equipment only against extensive damage from ground faults by operating circuit breakers or fusible switches equipped with electrically actuated tripping means. These devices may be supplied as an integral portion of the disconnecting means or as separate devices operating in conjunction with the disconnecting means. 
 
PB 2.2 has been developed by the NEMA 05LVDE-02-PB Technical Committee, and is a guide of practical information containing instructions for the safe and proper application of ground fault protective (GFP) devices. This standard is useful in commercial, industrial, and manufacturing applications where ground fault protective devices are applied in equipment.
 
PB 2.2-2014 revises and supersedes PB 2.2-1999(R2004, R2009). It may be downloaded at no cost or purchased in hard copy for $91 on the NEMA website.
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