Great stuff, still not convinced by AFDD's JW, I sense your'e not either. look forward to the testing. What's the point in the not being able to detect serial arcing under 2.5A? lighting circuits is where I usually find faults, in ceiling roses, screw terminal JB's and a case where someone had screwed through a 1.5mm T&E causing parallel arcing to CPC and nearly burned the wooden joists. I was hoping this would solve that problem but alas, it seems not. Just a cash cow at the moment, and the prices are silly too. Great video John.
@adrianshingler9783
Жыл бұрын
I love your sense of humour John, laughed out loud with regards to your comment regarding the the flame symbol, you are a total star 😆👍❤️
@johnsommer9818
4 жыл бұрын
Thank you for producing an informative video, these really do help others to learn about and better understand these technologies, particularly when they remain uncommon and come a at a premium cost. My understanding of BS 7671 is that whilst isolation of the neutral conductor is required for every circuit, it can be provided for a group of circuits by a common means. In current practice, in single-phase installations, this has been provided by using double-pole isolator switch or by double-pole RCCB upstream of individual circuit protective devices e.g.single-pole fuses, MCBs or RCBOs. Therefore a single-pole AFDD is no different and may be used on a TT system if DP isolation exists upstream, although to fully isolate the supply, a large part or the entire installation must be collectively isolated. Currently this protection/isolation arrangement is the norm and whilst not completely ideal, unless we see double-pole RCBOs and AFDD devices become more mainstream I think we will have to accept this view which permits their use.
@jondonnelly4831
4 жыл бұрын
Imagine every circuit needing these for edition 19 :D
@samstretton3890
4 жыл бұрын
should be done i think boilers are a grand why shouldnt fuseboards be
@fin_fet
4 жыл бұрын
They are required for most residential circuits (family rooms, bedrooms, dining rooms etc) here in the US.
@zjzozn
4 жыл бұрын
Michael Watkins what about kitchens? How does the cost compare to an RCBO (combined RCD and MCB) ?
@markholmes4143
4 жыл бұрын
@@zjzozn AFDD's approximately 6 to 10 times more expensive than RCBO.
@loosecannon5813
4 жыл бұрын
I see screwfix are selling the older Wylex afdd for £205.... 👌
@markholmes4143
4 жыл бұрын
On single phase TT installations single pole devices are able to be used for fault protection, isolation must be double pole which could be a main switch in the consumer unit as I understand it. Thanks for the video never heard of that make. Very difficult to justify fitting AFDD's at the moment given the limited use and cost.
@iansyme3535
4 жыл бұрын
Fair enough John, IF it works when you get round to testing it!! And by the way, just how many customers are going to be willing to cough up another say £1500 for contactors alone if replacing an old consumer unit? This could easily bring the installation costs to a couple of thousand pounds!
@piratedprivacy9052
4 жыл бұрын
JW, any thoughts for some AFDD different-module TEARDOWN?? 🔥🔧🔎📹
@l4Green
4 жыл бұрын
Thanks JW. Good stuff, I always wondered about the use on lighting circuits (say with potential rodent damage) but it appears these would be ineffective.
@holmespianotuning
4 жыл бұрын
Appalling English on the information sheet. “Allows to provide”.
@chriholt
4 жыл бұрын
Happy New Year JW.
@fraserreid719
4 жыл бұрын
Informative
@fraserreid719
4 жыл бұрын
What's your thoughts on RCBO costs and if more expensive it better. Schnieder acti 9s are £114, where as Eaton ones are £24.99
@jwflame
4 жыл бұрын
Some manufacturers make better products than others. However price isn't the only factor, and more expensive doesn't always mean better quality, just as cheaper doesn't always mean worse.
@fraserreid719
4 жыл бұрын
@@jwflame I always spec acti 9s when any installation is happening under my remits. Do you use fluke multimeter or mertle? Found I'm getting interference in the factory I work testing with the fluke for earth loop, but there's every cable you can think of in the same compartment In the trunking and the cost to put new containment is laughed att by management. Also it's a 19 year old building and clean rooms involved, some of they sockets aren't even getting an earth at them due to cleaning agents, again the cost factor is laughed at so I refuse to test/sign off test certs for said clean rooms and I'm close to walking away altogether as it's that bad
4 жыл бұрын
How serious a problem is arcing? I can only see a problem if you have a rodent infestation nibbling the wires. This to me looks like a job creation scheme making a standard that the authorities will force on us for very little benefit. Plus what is the life of these things? I bet they have to be change every 5 to 10 years.
@denischarette3627
4 жыл бұрын
John, on the information sheet, they don`t mention currents between 40A and 75A. I wonder what would happen if such a current occurs because of arcing, be it parallel or series.
@SteS
4 жыл бұрын
1 year guarantee for such a device. Is that normal? (not an electrician but keen interest) My PSU for my pc is 10 years, so I find this quite odd that a simpler device has such a low guarantee.
@whizzo94
4 жыл бұрын
Have any of the AFDD's that you've tested impressed you? Surely there's got to be a question mark over using a microcontroller in a safety device?
@jwflame
4 жыл бұрын
They work, but only under defined conditions, the main one being the minimum current needs to be about 2.5A, so they are of minimal use on things like lighting circuits. Microcontrollers in safety devices isn't anything new, they are used extensively in things like car airbags.
@zjzozn
4 жыл бұрын
👍
@davepusey
4 жыл бұрын
Neutral and CPC are always at the same voltage, so it is not possible to get an arc between them. This is why the AFDD only monitors the Live.
@TheManLab7
4 жыл бұрын
If they were a 1/10th of then price, then I'd install them. But until that price comes down to something reasonable, I won't install them because there just stupid money!
@kyleshady9777
4 жыл бұрын
What happens when this is installed on a circuit with arc discharge lighting like metal halide?
@SeanBZA
4 жыл бұрын
Nothing much, as the metal halide lights generally have a very smooth current waveform due to the large inductor and the power factor correcting capacitor. Might trip though if you have a massive amount of them on a single breaker ( around 5kW, 10 400W MH grow lamps) and the lamps go EOL and cycle continuously, but that is a niche application ,and if you are doing that then you are probably not going to actually use breakers or a meter anyway.
@bjtaudio
4 жыл бұрын
Really big, more expensive, and more complicated more to go wrong.
@rajmaharjan5693
4 жыл бұрын
Hi john does this AFD detect where the main switch at CU meter tails terminals connection due to loose connection?
@jwflame
4 жыл бұрын
No, it can only detect arcs on the load side.
@phillipjackson101
Жыл бұрын
i would have thought it would as current in a circuit is the same at all points. as the sensor is only in the line and the ac flows back and forth the sensor won't know which way the arc is coming from. i think 😆 however, if there are lots of circuits, the arc in the tails may be shared out and too small to detect on a single circuit.
@fads44
4 жыл бұрын
So does the MCG device only detect arcing on the live conductor only (i.e. no neutral arcing protection)? As the schematic at 5.00 appears to show AFD only on the live conductor, it'd be interesting to know if the Siemens/Electrium/Crabtree/Wylex single module, solid neutral AFDD/RCBO unit affords neutral arcing protection too or indeed if the larger (2 & 3 module devices from ABB, Eaton, Hager & Schneider provide protection for arcing neutrals??
@davidstone1579
3 жыл бұрын
An arc (series) will affect the whole circuit current, so detect it anyway.
@andrewwilson4402
4 жыл бұрын
john will u marry me : ) xxx. only joking. Very informative as usual.
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