What is the difference between a type A and type AC RCBO or RCD?

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RCD's and RCBO's at some point in almost every electrical circuit within residential electrical installations.
However, not all RCD and RCBO's are created equal. Older electrical installations mainly comprised of linear loads leakage currents would just contain AC waveform components and would trip a type AC RCD or RCBO. Modern installations are increasingly using electronic power converters, from LED lighting and EV chargers to inverter drives on washing machines, which can inject a DC biased leakage current.
This move to electronics can cause problems with type AC RCDs - Joe Robinson explores the difference between type AC and type A RCDs.
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Опубликовано:

30 июл 2024

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Комментарии : 68

@stokielee 4 года назад

For someone just entering the electrical industry this information is invaluable. Thank you Joe

@rbtx99 8 месяцев назад

When electricians are learning from RU-vid... God help us! No disrespect to you but all this should have been included in your training courses.

@jameshegarty1439 4 года назад

Video about type F and B please

@artisanelectrics 4 года назад

Great video very well explained! 👍

@stevendouglas3860 3 года назад

Very important and Vital to know... Thanks Joe 🤸👌

@terrysteel6706 2 года назад

Great video very informative and straight to the point. 😎

@5e34nut 3 года назад

Fantastic and easy presentation Love your channel

@robartley 2 года назад

Excellent clear concise explanation.

@haydnroberts781 3 года назад

Totally agree. I have a question if someone could help? Any ideas on what should happen/do:- If you're doing a small minor work on a lighting or socket circuit, that had a dual AC RCD fitted to a modern consumer unit, and the circuit(s) your working on has PV, EV or Aircon sharing the same RCD? Same question with new installations? Thanks ( sorry for the long question!)

@sygad1 3 года назад

thanks for the very clear explanation

@gazdkw82 4 года назад

Would saturation from DC be picked up on an RCD test? Could that be a reason why some rcds dont trip?

@xylo66 4 года назад

Very helpful. Thanks

@GeoffInfield 2 года назад

FINALLY! Thank you sooo much - I live on a boat that recently failed it's electrical WOF because I have a type AC RCBO instead of a type A . You would think that this would be easily fixed wouldn't you but to a non-electrician like me so many places interchange the residual current type (A,AC) and the tripping curve (B,C,D) and I kept discounting ones that said "Type C" only to EVENTUALLY work out they were actually Type A, C16 ?!#$^!# THANK YOU!!!

@RWATraineeElectrician 4 года назад

Interesting, thanks for sharing 👍

@Atyourmumshousern Год назад

Thank you mate

@9plusinstalaciones 4 года назад

Of course this has been doing the rounds for some time but what level of DC can saturate an RCD ?

@tomward62 Месяц назад

Super helpful. Thank you

@kimmythesparks 2 года назад

Thank you for sharing this information ⚡️👏⚡️👏⚡️👏⚡️👏💛💛💛💛

@rickwookie 3 года назад

Great video, but could someone explain how one identifies an RCBO with a Type A (or B) RCD element? Since we use Type A, B C & D to refer to the overcurrent tripping curve in both MCBs AND RCBOs, something advertised as a Type A RCBO still only has equivalent to Type AC RCD protection, right?

@efixx 3 года назад

You can identify the RCD type by the symbol on the front. The B, C or D comes before the rating, as in B32, C16 etc. Check out our free CPD on RCD types here: www.efixx.co.uk/Know%20How/rcd-types-cpd

@Justmythoughtsonthis1998 2 года назад

@@efixx is that not that b,c,d is the curve of the tripping time and not the type of RCD it is? This information seems to be hard to nail down.

@enriquedmu1 4 года назад

Ive unfortunately missed most of your excellent work this week due to work on the Brecon mountains. Not much signal up there. I have a question thou, does having a mix of A and AC type RCDs/RCBOs have a detrimental effect, just like different brands of mcbs can? Could you have a situation where a AC type could effect an A type or vice versa through some crazy science that only Joe can understand?? My initial thoughts would be no, but it intrigues me anyway.

@efixx 4 года назад

Welcome back - we will explore this further as we've had mixed opinions on this.

@bramcoteelectrical1088 2 года назад

Mixing woukd just mean the type A will function correctly if presented with a dc injected fault. But the type AC have a high chance of not functioning correctly so regardless of mixing some will do there job and some wont. Maybe i stand corrected... Best to try to just change out thats what i would do myself

@raychambers3646 3 года назад

Can't they iron DC interference out if it's a danger to the circuit protection?

@michaelcostello6991 2 года назад

Now I know what the symbol on my rcbo means. Lucky it is Type A Thanks

@salamsaloom2477 Год назад

Thanks for this great information Any explanation why DC current do not allow RCD to detect the fault and trip

@davideyres955 2 года назад

As a consumer, does the test button cause it to trip if it’s saturated with DC feedback? As I understand it the test button actually induces an imbalance between live and neutral so I suspect it does, but it would be good to know as I don’t want to assume everything’s fine when I hit test and the find out it’s not when it’s actually needed. Cheers.

@bramcoteelectrical1088 2 года назад

I would say yes would still trip via the test button press but the issue would be that the load.... would that work Maybe no so. This leads to The injected dc appliances causing an issue might not be on at that present time. Easier just to change out to type AC and keep compliant is my best answer!🤓👀

@davideyres955 2 года назад

@@bramcoteelectrical1088 thanks, seems strange the the reg writers are concerned with arc faults, but let’s face it how many people have led lights and computers, chargers av kit etc in their houses possibly negation rcd safety devices. I would have thought mandatory advice to update would have been time better spent than afdds

@jamescleary5198 3 года назад

Surely they should only sell type A I mean what household doesn’t have a washing machine

@tom_programator2566 3 года назад

which is the difference between curve circuit breakers b and c 1p+n

@ahmedalbassam4199 3 года назад

Great video .. pleas what meaning rcbo type ele or uses.

@alhasan4248 2 года назад

Please... How to distinguish between the RCCB, ELCB, RCD and RCBO circuit breakers in terms of appearance only.. Many companies do not write the name of the circuit breaker. Thank you

@MrKwelsh 3 года назад

What about a video on rcd's in series Joe?types etc. Keep up the good work

@efixx 3 года назад

It’s being worked on 👍

@Mooncake69420 2 года назад

excellent explanation video man. thanks loads (pun intended)

@sopissedoff Год назад

I wonder could u shed any light on a problem, we have a podpoint car charger it was working great until we moved house and got it reinstalled,2 or 3 nights a week it trips the rcbo The installer said to change the trip incase it was at fault ,this hasn't helped ,our house is only about 50 feet from the substation that feeds the estate ,would this have a bearing on it.

@MsTommyknocker 3 года назад

Does this information also apply in Denmark?

@efixx 3 года назад

Yes it’s harmonised across Europe - UK always seems a bit behind in driving through the standards.

@bilalahmedmustafa2286 Год назад

Nice

@154electrician Год назад

What would you code a type ac in an existing installation on an eicr?

@rayc1503 6 месяцев назад

C3 all day long, as long as it complied to regs at the time of installation.

@charr6108 2 года назад

6mA of DC passing through it?

@rodgerq 2 года назад

Thinking about this more and more. You really need a crystal ball to spec up a board. How does one know what a consumer is going to use in the future? Maybe it should be made law that appliance manufacturers are to include a product specific internal protection device lest individual specific RCD sockets be fitted for certain products. Maybe I've had too much wine.

@johnchristmas7522 2 года назад

The only way around that scenario Rodger is to spec for the most dangerous situation, as we used to say years ago, wire as if your customers are complete fools.

@simonschertler3034 4 года назад

Here in Germany the AC type must not been used since the early 90th. Here is the same discussion in place, if you should use a type A or B 😉

@efixx 4 года назад

Does anyone make a type B RCBO?

@simonschertler3034 4 года назад

@@efixx i don't think so. I have never seen one. But here rcbos aren't used very often. Normally 2 or 3 3phase rccbs(RCD) are used in houses. Rcbos are used in flats for the hallway.

@MrKwelsh 3 года назад

👍

@kidalabama Год назад

what about b, si type?

@mastergx1 2 года назад

Just about everthing has some kind of electronic control on it now. Cookers, fridges, AV, LED lighting, boillers, showers - the list goes on and on. Even if the current appliance on a circuit is a dumb resistive load - lets say a cheap cooker, theres no way to know if that will ever be changed out for one with more buttons than a jet fighter. To that end i've started using type A as my standard. On top of that, my normal practice now is to quote for full RCBO (Type A of course) board to split up that back-feeding DC. I also install SPD's as standard now to help protect all those electronics.

@efixx 2 года назад

Sounds like your onboard 👍

@avfczoff Год назад

Are we meant to now produce a C2 for most households that have an AC type RCD? Almost every EICR will fail in that case as most will have AC RCD if any RCD is even in place!

@ayman7elwan70 Год назад

Which one the best Type A or type AC

@efixx Год назад

Type A

@dexwhitmore 4 года назад

Going out on a limb here burin guessing there is nothing compelling equipment makers to stipulate how much, if any, thier products could leak DC current in a AC system. Do we think that there should be such conformity (if it doesn't already exist), to help sparks and end users better understand what thier equipment does to the installation and any connected equipment?

@efixx 4 года назад

Ah - where would be be without regulations! - the link below is useful - "normal" leakage current - from eg EMC filters on appliance inputs. www.meanwelldirect.co.uk/glossary/what-is-leakage-current/#:~:text=Leakage%20current%20is%20the%20current,such%20as%20the%20human%20body.

@philotis1896 Год назад

wish guide to installation of manual transfer switch UK Where we reroute existing house circuits ( eg gnd floor) to switch between grid and external generator ( solar battery off grid in my case ) As the funder of this project this part is elusive (USA does this all the time with many helpful videos but UK silent) Critical for planning is the size /cost of associated equipment. Wish Application Single phase Domestic premises 100A main fuse Max load on gen 40A : A schematic diagram showing recommended/ Typical manufacturers kit ( switch consumer unit etc ) So I can look that up in theri catalogue and get and idea of teh size of these things and cost . Waiver Of course : "Your plans must be approved and installed by a qualified electrician " Why is the UK industry so reluctant to help . In USA they fall over themselves for customer service. Closest so far is Wylex. Alas overlooked re-routing selection existing circuits. Asked many ... either no response or no further information . Ciao MsO

@elektrikeren5049 4 года назад

AC types are not allowed to be installed in DK anymore. 🇩🇰

@stewben1169 4 года назад

People will still install type AC RCD/RCBO over type A because of cost the only was is to 1: Stop the manufacturing of AC types 2: A big reduction is need in the cost of type A compared to type AC.

@artisanelectrics 4 года назад

There’s not really a difference in cost any more, the good manufacturers like Hager make Type A as standard now.

@davepusey 4 года назад

Or they could just ban the future installation of type AC in the 19th edition.

@kittsdiy 4 года назад

In Belgium type AC is already not allowed anymore by the A.R.E.I .. for many years ... also most wholesalers you only find type A ..( or now starting type B . but verry expenisive for now )

@rodgerq 4 года назад

Just ban the future use and installation of AC and be done with it.