Hello,
I was doing some research on switchboards vs. switchgear, and I came across a discussion about ground faults, and that the MCCBs in switchboards have a very low single-pole ground fault, despite the fact that their short-circuit rating can be similar to that of switchgear. Because of this, switchboards should only be used on solidly grounded systems... I kinda realized that I don't really understand ground faults, and I definitely don't see how a single pole fault would affect an ungrounded or resistance-grounded system differently than a solidly grounded. Does anyone know of a very basic and practical explanation of what happens in a ground fault, with the various configurations? Thanks!!
Here's a link to the original document - see the section near the bottom of page 2
http://www.geindustrial.com/Newsletter/ind_nov01_left3.pdf
I was doing some research on switchboards vs. switchgear, and I came across a discussion about ground faults, and that the MCCBs in switchboards have a very low single-pole ground fault, despite the fact that their short-circuit rating can be similar to that of switchgear. Because of this, switchboards should only be used on solidly grounded systems... I kinda realized that I don't really understand ground faults, and I definitely don't see how a single pole fault would affect an ungrounded or resistance-grounded system differently than a solidly grounded. Does anyone know of a very basic and practical explanation of what happens in a ground fault, with the various configurations? Thanks!!
Here's a link to the original document - see the section near the bottom of page 2
http://www.geindustrial.com/Newsletter/ind_nov01_left3.pdf