Ground Leakage Current Content Release #807
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On circuits protected by gfcis (ground fault current interrupters), leakage current can cause unnecessary and intermittent tripping The use of some protective devices is specifically required in. In extreme cases, it can cause a rise in voltage on accessible conductive parts.
Measurement techniques of leakage and ground currents
Ground currents may be sourced from the source being considered, or from other sources in the facility, and it is often difficult to identify the specific cause of ground currents Other types of leakage current and ground fault protective devices have been introduced for various applications since the introduction of gfcis Leakage currents are currents that are derived from normal and abnormal connections of the source to the safety earth.
Such currents can be the direct cause of problems, such as magnetic fields caused by net currents, or safety issues related to leakage currents
In other cases, the ground currents are not in and of themselves a problem, but can be symptoms of grounding problems in the facility infrastructure or equipment. The maximum allowed ground leakage current is a few milliamps (thousands of an amp) A sensitive current transformer connected to a monitoring device can measure leakage current The procedure for measuring ground fault current flow is to place the phase conductors and the neutral conductor through a current transformer (ct) as shown in fig
