#Hi Rick. # #You wrote: #<It is my understanding that shielded power cords are not allowed on #products in European markets. As I recall, the rationale is that if a #cord is replaced, there is no guarantee that it can, or will, be #replaced with a shielded cord. > # #Not as far as I am aware, and I have been designing mains powered stuff #since I was too young to know better... But then I'm not aware of any #manufacturers of Moulded Screened Mains Cable assemblies, they are #invariably home made. # #Screened mains cable is freely available on the reel (in the UK from people #like RS Components for instance) and I have used it when I have had #problems with radiated emissions or susceptibility on long mains cables. #Usually when a filter demonstrates a particularly arkward resonance..... # #Any component which is safety or EMC critical, and which may be changed by #a subsequent user can be made a condition of compliance by a relatively #simple statement in the instructions. i.e. under the general heading of #'Using as intended'. Use of the equipment without the particular cable is #therefore 'Not as intended' and therefore shouldn't be expected to comply #(and shouldn't be put into service). # #A thruppence worth.... perhaps. # #Chris Dupres #Surrey, UK.
If screened mains cable is used, then surly it acts like a coax (a poor one possibly) and transfers the energy, contained within, to a point where the cables are not shielded. This would probably be at the mains wall socket - where the energy could (would?) then radiate! If the intention is not to cause interference to radiocommunications etc. then how has the screened mains cable helped? The test might seem OK but how is "due diligence" served? Just thought that I would ask! Regards Tim Haynes ([email protected]) Disclaimer My mind is my own - blame no other for my thoughts.
