February 18, 2015
I do have a couple of questions, if you’ll forgive me.
1. The component is marked “can not isolated”, so originally the can will have been connected to the common negative. Has this feature been retained, and if so, how has contact been made with the can?
The can although stating “not isolated” didn’t have any continuity to the -ve tag so no I haven’t connected the can. If the can should require connection for screening purposes for example, the mounting clamp to the chassis provides the link in this particular case.
2. I have tended to avoid the use of adhesive tapes, because of the problem of the adhesive “escaping” from under the tape over time. Is Scotch Aluminium Tape conductive?
Scotch Aluminium tape is conductive on it’s surface but obviously the adhesive is not. I’ve been using this tape for many years and haven’t had any issues with the adhesive, it’s very good stuff and leagues ahead of other types.
Hope that helps.
November 21, 2015
Hope that helps.
Yes it does, thank you for the reply.
Clearly, in the example you have shown, the negative is brought out to its own terminal. Frequently, in my experience, this is not the case and the can is used to provide the negative: clearly, here, a slightly different approach would be needed. This isn’t to detract at all from what you’ve done which, as I said, seems to me to be very skilful.
The reason for asking about the conductivity of the Scotch tape is that, some years ago now, I was involved in looking at a safety case for a stage effect which involved blowing large quantities of apparently aluminised plastic film, in the form of “chaff” (thin strips about 30mm x 3mm) about the auditorium. The main issue was whether these were conductive, given the scope for introducing earth faults if they were and if any of them got into any of the luminaires (or, indeed, into the dimmer racks). Having established that the production company’s view was that product data sheets were for geeks and need not concern them in the slightest, we did some extremely unscientific experiments. Applying various amounts of heat, we came to the conclusion that the base was probably mylar, and applying a 1kV Megger, we were very surprised to discover that, despite being metallic in appearance and highly mirrored, the strips were completely non-conductive on both sides. The moral here being that all that glisters is not necessarily metallic gold, or even silver or aluminium, and that appearances can sometimes be very deceptive.
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