al hildenbrand
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- Minnesota
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- Electrical Contractor, Electrical Consultant, Electrical Engineer
AFCI and GFCI Kitchens
- Thread starter Sam Nation
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mbrooke
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Even if the electronics are 100% effective, how many fires per year actually stem from arc faults? ESFI says 30,000. How in in the name of :rant: did they reach the number? :blink: Because I still cant find anything public.
al hildenbrand
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- Minnesota
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- Electrical Contractor, Electrical Consultant, Electrical Engineer
Stonewalls.
Early on, Don Resqcapt19 did some great economic statistical analysis, even got it entered into CMP record several time. . . I don't have any copies readily available, . . .
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- Illinois
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- retired electrician
al hildenbrand
Senior Member
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- Minnesota
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- Electrical Contractor, Electrical Consultant, Electrical Engineer
al hildenbrand
Senior Member
- Location
- Minnesota
- Occupation
- Electrical Contractor, Electrical Consultant, Electrical Engineer
I found it to be a dense read, and quite thought provoking.
The signal information manipulation, in multiple parallel paths, turning the signal in each path into a positive or negative number, that then amasses (or diminishes) in a summing hopper, which, at a pre-established threshold number, trips the interrupter mechanism, was the first real indication of a possible method by which an infinite number of variable arc signatures could be discriminated. At least in my mind.
I am sad that nothing of equal or higher caliber has been released since then, at least that I have found, thus far. This White Paper whetted my appetite.
mbrooke
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Spot on!
Not just in your mind, it is that way. There is NOTHING fixed, easy or set in stone when dealing with arc fault detection technology. You need FAR more computing power then seen in any resi grade AFCI to analyze a near infinite current waveform continuum. Even with the correct data processing power, the programmers still need to tell the computer what to look for in that data. This another project altogether as people must first gather raw arc signatures from countless consumer electronics and lab simulated arcing sitting down and looking for patterns to tell each one apart while no to contradict each other. It is indeed nothing short of infinite, dangerous arcs alone produced in the laboratory each have a unique fingerprint. Factor in some mind numbing number of other possible wave-forums coming from running electronics on the circuit and you end up with an AFCI that could see anything at any given time. But, their has been a miracle breakthrough, a holy grail to the above challenge. Researchers have discovered a single variable, a single method of discrimination which puts billions of unique wave-forms instantaneously in two categories with with 100% accuracy. Some said it would never happen, it just could not be done, 'you just cant quantify infinite variables into one number' Well folks they have been proven wrong. Lab testing has shown one thing to be present 100% of the time in arcing NM: current leaking to the EGC. In none arcing NM, no matter what the wave pattern of the load, 100% of the time current did not leak to ground. So dangerous arcing=leak, safe arcing=no leak. Brilliant!
Whats more, its even easier to build a computer smart enough to sense leaking with 100% accuracy. A single deferential processor looking for imbalance between hot and neutral via toroid coil can detect leakage no matter the current signature produced by the load or bad arc. This concept even has a name, zero sequence current detection or deferential current. In fact, a highly matured, evolved device already exists that does the same: a ground fault circuit interpreter. Usually set a 5ma, but 30 or 50ma deferential trip point can be configured with ease where normal leakage current may approach 5ma. Problem solved, we now have this fool proof, 100% reliable, cost effective arc fault detention device we were looking for! :happyyes:Well, its sarcasm, but this is what has me flabbergasted. There is no reason to re-invent something that goes backwards in human progress.
romex jockey
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al hildenbrand
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- Minnesota
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- Electrical Contractor, Electrical Consultant, Electrical Engineer
romex jockey
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- Vermont
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- electrician
Spot on!
.
How big are SCADA systems Mr MBrooke.?
https://upload.wikimedia.org/wikipe...a_Animation.ogv/Scada_Animation.ogv.480p.webm
This is in annex G of our book, i don't know why....
~RJ~
mbrooke
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Huge. And the devices they control are far more intelligent then a simple AFCI. "Google sensitive earth fault logic" "high impedance downed conductor detection/protection" :thumbsup:
- Location
- Massachusetts
If you browse the ROPs you will find a person who keeps submitting a system where the OCPD and the appliances will communicate with each other so that the OCPD will know what each appliances is expected to use.
Wait till we start installing those ....
Wait till we start installing those ....
mbrooke
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If you browse the ROPs you will find a person who keeps submitting a system where the OCPD and the appliances will communicate with each other so that the OCPD will know what each appliances is expected to use.
Wait till we start installing those ....
:happyno::happyno:
Im sure that person is somehow in someway affiliated with a major manufacture, even if doesn't show. Soon we will start seeing studies about how fires result from "missing current syndrome" where current goes into alternate dimensions resulting black hole heating which in turns ignites building material. But that only doesn't make sense because your not a CMP or manufacture in order to get it.
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