---------- From: John Quinlan <[email protected]> To: [email protected] Subject: suppressors between the mains and earth List-Post: [email protected] Date: 1996¦~11¤ë8¤é PM 09:41
I have an interpretation of various IEC 950 clauses that was issued in 6/95 by the Operational Staff Meeting under the auspices of Cenelec. In this document it is stated that some countries (e.g. Denmark, Belgium, UK) will not allow transient suppressors to be connected between the mains and protective earth. Does anybody know the reasoning behind this interpretation, why it varies by country, and its bearing on other similar standards such as IEC1010? In IEC 950 it is assumed that the protective earth connection may get lost ( in old buildings with bad wiring) which is assumed to be the single fault in the whole system, then the surges would discharge to the operator of the equipment. IEC 1010 takes a different view on loss of earth connection. Regards, Rene Charton TUV Rheinland Taiwan
