What’s inside a Single module AFDD? - Arc fault detection device Crabtree / Wylex

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4 жыл бұрын

How do they combine all circuit protection functions into a single DIN rail module? We lift the lid on a single module Crabtree / Wylex AFDD (AFCI) Arc Fault Detection Device to find out what’s inside.
When AFDD's crept into the 18th Edition of BS7671 UK electricians expected consumer units to grow to accommodate the 2 or 3 module devices. The clever boffins at Siemens (owner of Wylex and Crabtree brands) set about shrinking the tech.
This single AFDD breaker includes all circuit protection functions.
MCB - Minature circuit breaker for overcurrent and short circuit protection.
RCD - Residual Current Device for earth fault protection.
Earlier in 2019 Siemens introduced a single module RCBO with the above functions which included double pole isolation of line and neutral conductors.
This new device adds - arc fault detection to the package.
Arc fault technology is a new technology to help prevent electrical faults (ARC's)which can cause fires. BS7671 suggests using them in buildings with sleeping accommodation, timber-framed buildings and high-risk buildings such as museums.
#efixx #bs7671

Пікірлер: 25

@user-kv8sm7pl6e 2 күн бұрын

Can't thank enough. Great job guys

@danielvelinski9522 4 жыл бұрын

Thanks for the Premiere - really interesting to see inside this kit!

@CatalinVoinescu 3 жыл бұрын

Great video! Did you guys notice the thin blue wire that goes from a little contact to the PCB? That disconnects the electronics when the breaker is off, and lets you test the circuit without disconnecting the wires. It's also amazing how they use two solenoids on a single mechanical breaker. Surely that's half of the secret of how they could get so much functionality in one small device.

@ahmedelectricianofiraq5550 4 жыл бұрын

Great ,interesting thing , Now we got many of protection in one device , & it's size like a normal circuit breaker. Keep on 👍

@muzikman2008 4 жыл бұрын

Cool, thanks for taking one apart.. I would like to know the science behind how the processor detects arc faults too. Looking forward to your next installment. Great video as usual chaps 😁

@AhmedMohammed-jv6sr 4 жыл бұрын

Another great video thank you for the insight. Just amazing what Siemens have cramped into a small device

@richardwilliamson3624 4 жыл бұрын

Great review. Many thanks.

@rjkeeves 4 жыл бұрын

It detects the arc via listening to the low RF noise generated directly down the L & N when the arc forms it's normally quite a bit more noiser in magnitude than the general background making it quite easy to detect.

@colinleahy4824 4 жыл бұрын

Great video 👍 , interesteing technology , my experience with certain budget brand single mod DP rcbos and bussbar combinations , has taught me that the terminals do not take any abuse , especially overtight connections . Torque screwdrivers are a must now , eventually I can see a column in test certs.

@gavinquin1913 3 жыл бұрын

You guys are legends, regards from South Africa

@markrowland5393 4 жыл бұрын

Excellent video. Very interesting. Thanks,

@richardwash6678 4 жыл бұрын

Great video lad's, JW would be proud! 👍

@kieransmith9565 4 жыл бұрын

Great viedo like always guys

@manafparvez 2 жыл бұрын

Thanks for the video guys. Did you find any current sensor or HF sensor inside?

@stormriderrider781 2 жыл бұрын

It monitors HF noise and LF noise and gives command..i was keen to see the hf noise detector and current sensor within the device

@alunroberts1439 4 жыл бұрын

Am going to soon set up a test rig an blast some with DC - Just to see what will happen. I did help with a big test rig back in my college days. On the back out of sight or students we had switches to put faults on the test rig. Such as switching in 500 k 1 Meg 2 Meg resistors also had two way light with just a long long long run on each side L1 L2 so we could switch it in to live and neutral and also link it out just seeing good numbers don't teach you much. I have been out of it to long am reading each day on the new reg;s need to get back in to working using my brain was in dead end jobs for to long. We also had other faults to switch in and out. Took a part a socket cut one side out an soldered in a 3 ohm cut the live an stuck it in other sockets we had it on the CPC but each wired up to switch to link it out. Was for socket testing Rn L1. Some were in the junk pile I hope I still have old photos of it.

@davids3095 Жыл бұрын

Should have used two afdd, to show both sides together.

@alunroberts1439 4 жыл бұрын

Power it up open and take test voltages -

@guffermeister 4 жыл бұрын

Don't plug it in - tear it apart

@bryanbattersby7333 3 жыл бұрын

Please stop saying MCB - That was the old BS 3871 standard. Current devices are referred to in their standard BS EN 60898 and in BS 7671 as just Circuit Breakers.

@noelburke6224 Жыл бұрын

This is ovrprotection, just adding extra expense and potential problems into the system. It's not about safety it about money and profits for the manufacturers.,better to control the quality of the materials and devices that are already in production. The quality has been deterioration for a number of years.

@alunroberts1439 4 жыл бұрын

I still think it not as good - How meany faults can it clear until it fails it self

@efixx 4 жыл бұрын

Good question - we will dig a further on this.

@stormriderrider781 2 жыл бұрын

As close as 20000 operations