Hi Rich. The exception being Table G.2 of IEC60950, 3rd ed. Table G.2 clearly states its applicability up to 2km, when using Annex G and its "Alternative method for determining minimum clearances."
Peter L. Tarver, PE ptar...@nortelnetworks.com From: Rich Nute [mailto:ri...@sdd.hp.com] Hi Doug: IEC 60950 differs from IEC 60664 in that the clearances are for sea level, not 2000 meters. See Table 18, Note 2. Since 664 is the reference standard, I suppose one can ask whether the 950 authors correctly transposed the 2000-meter clearances from 664 to sea level clearances for 950. I have had the impression that the 950 authors have always taken a very conservative approach to clearances and have invoked distances larger than those found in 664. Regards, Rich
