There seem to be many unintended consequences generated by the Amd 2 DPC. I wonder why it is US who sees them and not JPEL/64? Is it the lack of experience of JPEL/64 or is it something else?
There seems to be a tacit assumption that AFDDs do as marked on the tin. If one looks on youtube and tries a few videos, is this assumption valid? I am looking for evidence that they are effective in reducing domestic fires, does anyone anywhere have any? My and several friends' attempts to test them have been in many ways less than satisfactory, and we tend to suffer with "not quite the right kind of arc fault" syndrome. We have also had severe difficulties establishing arcs between copper conductors, and a few slight sparks are not really enough to light even a cigarette paper. Just how far will 230V jump to start an arc? So far I think it is less than a tenth of a millimetre, and to get any heat at all is difficult because it instantly extinguishes unless one of the conductors moves away. Air really is an excellent insulator!
With this fire reduction information I would find it easier to reccomend fitting AFDDs to customers, but NONE of the manufacturers will give it to one, which is seriously bad marketing, unless there is no evidence in which case surely the product is not of saleable quality. I also still do not understand why a single AFDD may not be fitted in the tails. As far as I can see, and from the specification document BS EN62606, the entire circuit current does not need to be the arc source, so why not in the tails, although a higher current device has no specification. In fact it seems that fitting multiple devices is planned into the EN, which I think odd.
There seems to be a tacit assumption that AFDDs do as marked on the tin. If one looks on youtube and tries a few videos, is this assumption valid? I am looking for evidence that they are effective in reducing domestic fires, does anyone anywhere have any? My and several friends' attempts to test them have been in many ways less than satisfactory, and we tend to suffer with "not quite the right kind of arc fault" syndrome. We have also had severe difficulties establishing arcs between copper conductors, and a few slight sparks are not really enough to light even a cigarette paper. Just how far will 230V jump to start an arc? So far I think it is less than a tenth of a millimetre, and to get any heat at all is difficult because it instantly extinguishes unless one of the conductors moves away. Air really is an excellent insulator!
With this fire reduction information I would find it easier to reccomend fitting AFDDs to customers, but NONE of the manufacturers will give it to one, which is seriously bad marketing, unless there is no evidence in which case surely the product is not of saleable quality. I also still do not understand why a single AFDD may not be fitted in the tails. As far as I can see, and from the specification document BS EN62606, the entire circuit current does not need to be the arc source, so why not in the tails, although a higher current device has no specification. In fact it seems that fitting multiple devices is planned into the EN, which I think odd.
