Class A Gfci
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The two most common types of gfci s used in the entertainment industry are class a and class c.
Class a gfci. Class a ground fault circuit interrupters trip when the current to ground has a value in the range of 4 ma to 6 ma. A gfci ground fault circuit interrupter is an automatic device that offers personal protection against lethal electrical shock or electrocution. There is a class a gfci that trips when a ground fault current exceeds 5 milliamps and there is a class b gfci that trips when a ground fault current exceeds 20 milliamps. Discussion starter 1 feb 17 2010.
Such a unit must follow the same ul 943c trip curve required of classes a c and d up to 300 ma but at currents between 300 ma and a current defined by where v is the line to ground voltage it must change to a trip time curve defined by. Joined jan 30 2009 1 118 posts. 210 8 a b protection for personnel. An interrupter that will interrupt the circuit at 6 ma or more but not when the ground fault current is 4 ma or less.
Jump to latest follow 1 3 of 3 posts. Gfci class a or b. The requirements exist to protect users against the possibility of shock in the event of a ground fault a condition in which electrical current accidentally flows outside the established circuit. Used where voltage to ground does not exceed 300.
It is a special electrical receptacle or outlet that can stop electrical power within milliseconds as a safety precaution. For further information see ul 943 standard for ground fault circuit interrupters. The second choice is to install a class e gfci with high speed tripping. Under these conditions a class d gfci with a 20 ma trip level may be used.
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