Hi Peter. You wrote: > > I have had several arguments with safety examiners regarding > compliance with EN61010 in cases where operational insulation is all > that is required -- cases in which no human access is possible, where > if insulation breakdown occurs, the equipment fails and just stops > working. It does not catch fire. No harm to humans results from > this breakdown. The examiners take the stance that since operational > insulation is not addressed by '1010, the most rudimentary form of > insulation must be basic insulation. This adds bulk to the wiring > and clearance/creepage burdens to the other components. It is, I > reason, an unjustified rationalization of an oversight in the > standard. Rather than use common sense and working the issue, the > examiners are taking the position that if it doesn't say you MAY do > such-and-such --- then you are forbidden to do it. > > I'd appreciate some feedback on this particular example. It's not > the first time that I've felt jerked around by an agency taking what > amounts to an arbitrary position on conditions not covered by the > standard.
Taking the point that the box is earthed, and the insulation operational. I've interpreted such things by applying the 'single fault' scenario, i.e. that the earth connection to the box is lost, and the only thing stopping he box go live is the insulation. 1010 requires Basic Insulation I think for that reason, doesn't it? Chris Dupres EMC Specialist. VG Microtech. cdup...@vgmicrotech.com tel +44 (0) 1825 761077 fax +44 (0) 1825 768343 'Opinions expressed are personal, not necessarily Corporate'
