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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module is withdrawn from a shelf that the fingers are exposed (our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
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