Hi Georg, I think that you are referring to three phase circuits used in industrial plants. My original question was for three phase circuits used residential and commercial locations. I can't imagine 480 V ac being used at home.
Thanks to everyone that replied on my question. I already collected a lot of interesting information. ------------------------------------------------------- Jean-Marie Vandenbulcke Snr Product Safety and Compliance Engineer BARCO n.v. Noordlaan 5 B-8520 Kuurne Belgium Tel: + 32 56 36 83 31 Fax: + 32 56 36 83 55 e-mail: [email protected] ------------------------------------------------------- -----Original Message----- From: Georg M. Dancau [SMTP:[email protected]] Sent: Thursday, October 30, 1997 1:47 AM To: emc-pstc discussion group Subject: Re: three-phase circuit ratings I cannot fully agree with Hans. We are exporting tobacco processing machinery all over the world and we encountered following three phase systems: Europe (continental) 400V/230V, (sometimes 380V/220V). , 50Hz Normally you encounter a Y configuration with earthed central point (TN, TNS, TNSC, TT according to IEC 38). US 480V or 460V phase to phase., 60Hz Delta or Y configuration. With delta configuration one always has a IT-Net. Even Y configurations are not always connected to earth (IT) Canada 575V phase to phase, 60Hz. Mostly IT networks. Japan >From electrical point of view, Japan is divided in two countries: 230V Phase to Phase, 60Hz Delta configuration, one phase connected to earth !!! 400V/230V 50Hz, as in Europe. If the configuration is different from Y with earthed central point, it is you'll probably get into troubles because the voltage of some phases to earth is higher than the rating of the capacitors in the power line filters. Leakage currents are also very high. Hope this helps George -- ************************************************************** * Dr. Georg M. Dancau * HAUNI MASCHINENBAU AG * * [email protected] * EMC Lab * * TEL: +49 40 7250 2102 * Kampchaussee 8..32 * * FAX: +49 40 7250 3801 * 21027 Hamburg, Germany * ************************************************************** * home: Tel: +49 4122 99451 * Hauptstr. 60a * * Fax: +49 4122 99454 * 25492 Heist, Germany * **************************************************************
