From: [email protected] Subject: EMI gaskets I am interested in hearing the experiences of anybody out there who has had a need for using EMI gaskets, in particular between metal faceplates of circuit packs in a Telecomms Sub-rack.
We have evaluated BeCu finger stock and foam covered with a metallised fabric and have found the metal fingers out-performed the foam. But, due to customer complaints relating to safety hazards posed by the metal fingers we are being pressured to use the foam. Has anybody else faced similar problems ? >From our experience, if the fingers are designed suitably for the application and applied correctly there should not be a hazard. My reading of IEC950/EN60950/UL1950 does not indicate any prohibitive clause relating to metal fingers. The closest (4.1.4) only stipulates protection of the OPERATOR and does not refer to SERVICE PERSONNEL, who would be the only persons exposed to the risk i.e. it is only when a module is withdrawn from a shelf that the fingers are exposed (our equipment is Central Office type). Does anybody know of any safety/regulatory objective reasoning for not using fingers, if correctly designed-in, in an application such as ours ? Regards, Brian McAuliffe Regulatory Engineering Tellabs Ltd Tel: +353.61.703269 --openmail-part-000dbaa0-00000001 --openmail-part-000dbaa0-00000001--
