I know of no law not permitting the use of GFCIs on IT systems, nor any reason for someone to make such a law. GFCIs (known also as RCDs) are being used on more and more products, not just branch circuits, and so will be turning up on IT systems anyway.
They will function to prevent electric shock arising from fault currents from the load circuits to other destinations (whether ground or other). They are differential current detectors (phase and neutral currents must sum to zero or current is going somewhere it shouldn't) and do not require the presence of a ground to provide protection. In the case of IT systems the impedance to earth is typically low enough that the GFCI functions normally. If the impedance is high or even open (as in some medical environments), shock would be prevented either by the lack of a return path or by operation of GFCI. The GFCI simply adds protection. Bob Johnson Georg M. Dancau wrote: > > Hi compliance folks > > I can remember to have read something about this subject but I can not > remember > where. Could somebody point the source for me ? > > The question is whether a protection with GFCI is allowed in IT > networks. > Are there some specific regulations for Norway? > > Thanks a lot in advance > > George > > -- > ************************************************************** > * Dr. Georg M. Dancau * HAUNI MASCHINENBAU AG * > * [email protected] * Manager 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 * > **************************************************************
