Atul, Whew!! been a long time since I had to think about 3 phase.... In a 4 wire system current does not flow through the neutral. The sum of the 3 currents in each line will add up to 0. In fact, you can remove the forth line from the system. Criag Clewell FCI Electronics -----Original Message----- From: Atul Rastogi [mailto:atulrastogi@xxxxxxxxxxxxxxx] Sent: Wednesday, November 27, 2002 5:55 AM To: < Subject: [SI-LIST] transformer ** Proprietary ** dear sir , i want to know in three phase four wire system current flows through = neutral ? in three phase threewire the difference of current will flow where? how to connect the earth fault relay to system ? ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu