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Link to PE article I was emailed about today:

18th Edition of BS 7671: send us your feedback - IET Electrical - http://electrical.------.org/wiring-matters/64/dpc/index.cfm?utm_source=Adestra&utm_campaign=Wiring%20Matters_March%202017&utm_medium=Wiring%20Matters&utm_content=Wiring%20Matters%20Magazine%20quarterly%20technical%20news&utm_term=http%3A%2F%2Felectrical.------.org%2Fwiring-matters%2F64%2Fdpc%2Findex.cfm&utm_contact=1100376306

Not sure it'll be worth wasting my time BUT we ALL need to give them feedback - for what its worth!
 
An extract from the above link:


"
Can arc fault detection devices distinguish between dangerous and working arcs?

Yes. Arc fault detection devices are extremely sensitive and designed to sense and respond only to potentially dangerous arcs. They use a special algorithm to distinguish between dangerous and working arcs – i.e. the harmless sparks that you see when you flick a switch or pull a plug.
This is important as over-sensitive AFDDs could be prone to nuisance tripping – e.g. interrupting a circuit when it senses the slightest harmless arc."

So more hassle for home owners, as if RCD's don't create enough hassle at the moment
 
Some more info on them:
 
This is the first I've heard of the AFDDs but I cannot see them doing a job that already MCBs do for Line/neutral faults as an arc after all is surely a short circuit of negligible impedance or it would not arc in the first place!
I also think that an RCD protected group of circuits would detect an arc through the CPC as an imbalance and trip within the times required.
People at the top of the banana tree (not you GMES) need to understand or recognise that fires are primarly due to poor workmanship or non CE marked appliances and accessories, both of which can be addressed as was mentioned earlier with the cancer analogy, by pre-emptive measures.
 
The manufacturers,will tell us,that these devices uses complicated algorithms,to determine whether or not,the detected "arc",is likely to risk a fire. Although how these devices would know the difference between an accidental,and a deliberate example,i do not know.

It is worth remembering,that pre 2007,much of the free world's finance and lending structure,was predicated on complicated algorithms...still,no harm done :(
 
The devices detect arcing from loose connections not short circuits. I wonder if it would trip when I'm messing around with carbon arc lights? :D
Thanks freddo, I jumped to conclusions with the picture on the link from GMES to the Schneider site - story;

IEC 62606: A first step towards international standards for Arc Fault Protection

It pictures an arc from line to neutral through the insulation. Perhaps someone needs to explain to them what it is!
 
So then to my understanding AFDD's protect the wiring against arc's within the fabric of the building preventing fires, then there is the protection against shock ie RCCD, RCBO's. So there must be a device that gives both types of protection and the question is how big are these little gem's going to be and how many modules are they going to take up in a dis board, then how bloody big a space will you need to site the boards bearing in mind that according to my NIC chap that radial circuits for all areas is the way that things could be going in the future as well.
Life is such a worry ;)
 

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