thank you so much for your explanation in so many videos you explain things so clearly and to the point you have got me out of a lot of trouble when I was stuck and didn't know the subject very well! TOP MAN! Thank you once again!

@learnelectrics4402

10 ай бұрын

You're very welcome, glad the videos helped. Dave.

Thanks David once again, recently installed a summer house with your previous video. Helped so much. I’m level 2 qualified so just an improver but got my work signed off by BA. Plus another fully qualified spark for your video. It’s really helped so much and you’re the don of the trade mate.

@learnelectrics4402

2 жыл бұрын

Thank you so much. You are never JUST an improver or JUST an electrician. You have a skill at whatever level you are at and every day you are adding to that skill. Keep learning, its a great trade and its taken me all around the world on some really interesting contracts. Good luck. Dave.

@kingofthetrowel1725

2 жыл бұрын

@StreamFeeds can I ask was it fairly easy to get building control to come out and inspect and sign off? What’s the procedure? I’m wanting to change my consumer unit and I’m currently re training as a spark, so would be brilliant if I could do it and get it checked etc also do building control do minor works sign offs for say if a wanted to add spot lights from a pendant and add extra light switches etc and also cracking video again dave many thanks🙌🏻🙌🏻

@StreamFeeds

2 жыл бұрын

@@kingofthetrowel1725 I wouldn’t get BC involved if you can help it. Do the work and get a fully qualified spark to sign off for you. It cost me £500 to get stuff signed off. I found someone just after I had my first encounter with BC and would never go back to BC again now… lol

@TheBullet2888

11 ай бұрын

£500 to get work signed off!!!! Wowza

Brilliant video. Thanks David. Great tutorial well explained.

@learnelectrics4402

Жыл бұрын

Thank you, comments appreciated, Dave.

Pure nerdspeak! Clear as mud! Thanks

@learnelectrics4402

10 ай бұрын

Thanks for watching, appreciated.

Great video. Had a chance to catch up on your content while I’m in hospital 👍 As always, very informative. Keep up the great work.

@learnelectrics4402

Жыл бұрын

Thanks for the feedback. Sorry to hear about the hospital. Get well soon buddy, lots more videos to come. Dave.

Thank you very much for posting this illustrative video.

@learnelectrics4402

Жыл бұрын

You are very welcome, glad it helped.

Thanks David, its really appreciable, I never had such kind of a learning experience before. Awesome videos with great explanation....

@learnelectrics4402

Жыл бұрын

Glad it was helpful Usman, appreciate your comments. Lots more to come. Dave.

Thanks again for your hard work so I appreciate every word you say in your lactuer

@learnelectrics4402

2 жыл бұрын

Thank you Radhi, appreciated. Dave.

What an excellent and well presented video A great help for revision as well as to update our knowledge base Very clear easy to understand and fully explained Thank you

@learnelectrics4402

9 ай бұрын

Glad it was helpful and thank you for watching. Appreciated. Dave.

Thank you Dave!

@learnelectrics4402

2 жыл бұрын

Thanks Tony, thanks for the support.

Thanks for a very informative and useful video

@learnelectrics4402

2 жыл бұрын

Great feedback Nic. Thanks.

Very good & easy explanation. Thank you

@learnelectrics4402

Жыл бұрын

Glad it was helpful, thank you.

Very timely video. Well explained as always David. Thanks for your time and efforts with this, always appreciated!

@learnelectrics4402

2 жыл бұрын

Thank you Francois, thanks for watching. Lots more to come. Dave.

Fantastic videos

Thank you for sharing about spd..

@learnelectrics4402

2 жыл бұрын

My pleasure. Thank you. Dave.

Many thanks dave for the hard work

@learnelectrics4402

Жыл бұрын

Very welcome, thanks for the support.

Thanks David. What an excellent video in simple word and simple way. It is more clear than courses we attended. Please produce more video regarding AFDD installation also. Thank you so much.

@learnelectrics4402

2 жыл бұрын

AFDD is on the list to be done. Thanks for watching and spread the word. Dave.

Thankyou, incredibly clear

@learnelectrics4402

Жыл бұрын

You're very welcome Will, appreciated comments.

David I've got it. The brown line at 8:20 from main switch out live only appears to go to SPD 'E' but in practice goes "as you say" from the main switch live out up behind the SPD (not connected) directly to the live in of RCD 1 as narrated. Many thanks for an excellent demonstration.

@learnelectrics4402

11 ай бұрын

You got it, I've just replied with the same info. Thanks for the support, appreciated. Dave.

VERY INFORMATIVE & CLEAR

@learnelectrics4402

Жыл бұрын

Thanks for that, appreciated. Dave.

Thanks Dave . well explanation

@learnelectrics4402

2 жыл бұрын

Thank you Abdirizak, appreciated.

Great explanation, thank you

@learnelectrics4402

Жыл бұрын

Glad it was helpful Dominikus. Thanks for watching, lots more to come.

excellent explanation on the spd Thank you

@learnelectrics4402

11 ай бұрын

Glad it was helpful, you're very welcome.

Great info on all of these vids.

@learnelectrics4402

2 жыл бұрын

Glad you like them, thanks for the support. Lots more to come. Dave.

Thanks David - You are a good teacher - easy to understand, concise and clear with an interesting voice (to someone from London!) generous with sharing your knowledge too.

@learnelectrics4402

2 жыл бұрын

Thanks Malcolm. I can never disguise my voice. Thanks for watching, really appreciated. Dave.

Excellent explanation. I see SPDs and MCBs installed upstream of the switch.

@learnelectrics4402

Жыл бұрын

Glad it helped Douglas, thanks for watching. Dave.

I will add that it is always best practice to install the SPD on the first outgoing way of the board as this keeps the connecting leads (and internal busbars within the panel) as short as possible. The voltage that is let through by the SPD depends on the design of the SPD itself plus any voltage dropped as a result of inductive loading on the connecting leads, longer leads will mean a higher let through voltage. Also, all leads connected to the SPD should be bound for as much of their shared length as possible in order to mitigate electrical field generation around the lines. Also it is a bit of an oversimplification to call an SPD a !type 1 device" or a "type 2 device", to start with most have combined ratings these days and all SPDs will have all 3 type ratings, they will just be different ratings depending on design and installation point intent.

@learnelectrics4402

8 ай бұрын

Thanks for your input. Appreciated.

Great job dave.. May I inform you about new important topics you can make explanation videos for - ups using, concept rating sizing - generators -capacitor banks -electrical rooms design - bus bars -voltage drop and short circuit - harmonics - light calcs Go ahead and great job man

@learnelectrics4402

2 жыл бұрын

Thank you Michael. We have a video on lighting calcs and distributed loads coming along soon. Thanks for watching.

❤thanks for sharing your video

@learnelectrics4402

7 ай бұрын

My pleasure, lots more to come.

Bravo!

@learnelectrics4402

2 жыл бұрын

Thanks Stefan. Glad you enjoyed it, lots more to come. Dave.

Helpful, thanks...

@learnelectrics4402

2 жыл бұрын

You're welcome. Thanks for the feedback. Dave.

Thanks for the video. Can I loop out of the supply side of the last DP RCD in my CU with 6mm or 10mm T&E to a 32A MCB then SPD both in separate enclosure. My worry was the cable size would be less than the pre-wired tails in the CU.

@learnelectrics4402

11 ай бұрын

Have a look at this video on cable sizing. The important thing is will the cable carry the prospective fault current at that point in the circuit, especially if the cables are going to enclosures some distance from the CU. kzread.info/dash/bejne/ZZN4mJdmY5XeoJs.html

Your channels really good

@learnelectrics4402

5 ай бұрын

Glad you think so, appreciated.

Very good video and explanation ❤

@learnelectrics4402

9 ай бұрын

Glad you liked it, thank you for watching.

Hi Dave…if an installation is wired with a TNSC earthing arrangement…should there always be an reference to direct earth from the main earthing terminal eg earth rod or bonding because if there was a surge on the neutral due to lighting strike from somewhere….with a TNCS earthing the surge protector will be shunting that voltage back into the same conductor that the surge is on…..so with all this these water and gas being replace with plastic…is there a requirement in the REGS for us to make sure there is direct refer to earth in my installation…as we know voltage always wants to go to earth

@learnelectrics4402

Жыл бұрын

Dennis, TNCS is earthed, back at the transformer. Hope this helps. Dave.

With not Neutral IN of two RCDs from “Main Netral Bar”? Or connect two RCDs with Neutral from SPD similar to how LINE connects from SPD to RCDs?

@learnelectrics4402

2 ай бұрын

Two RCDs needs two neutrals. Keep the neutral and line to each RCD separate otherwise you will get unwanted tripping.

very helpful

@learnelectrics4402

2 жыл бұрын

Glad it helped Ram, thanks for watching. Dave.

Thanks.

@learnelectrics4402

2 жыл бұрын

Thanks for watching Pradeep. Dave.

Nice explanatory video. Given the drop in price of SPDs since they first came onto the market we are seeing more of them installed now by default.

@learnelectrics4402

2 жыл бұрын

Thanks. I think it will not be long before Building Regs say that all new builds, board changes and refurbs must have SPDs as standard. Dave.

Hi, good video and a great explanation but a 230 volt ac system has a maximum instantaneous voltage to earth or neutral of around 325volts, ie the peak of the 230 volt supply is 1.414 x 230. So the SPD should not trigger until the instantaneous voltage exceeds 325 volts.

@learnelectrics4402

2 жыл бұрын

Thank you Roger, thanks for watching.

David excellent Video is there an error at 8:20 "Line inputs. Your graphic shows brown line input from main switch to 'E' of the SPD your narrative says to connect brown from the line of SPD 1 line in to RCD 1 line in and then loop to RCD 2. It does not mention the shown brown line out from the main switch live out to the @e@ terminal of the SPD! Is the graphic correct as shown with live from main switch to 'E' of the SPD?

@learnelectrics4402

11 ай бұрын

I think that's the way its drawn, E goes to the earth terminal and the brown goes behind the Devices to the line terminals. Thanks for watching. Dave.

Hello David from Bosnia, I have two questions 1. Do I need MCB 32A type B or type C for the SPD? 2. Is this good = from Main Switch to MCB 32A type B then to SPD and from SPD to RCD, (MCB is protecting all from Main S.) what do you think about this?

@learnelectrics4402

Жыл бұрын

I would use a type B to protect the MCB. The SPD should be immediately before the main switch or immediately after it. Some pre-loaded consumer units come with the SPD before the main switch. The RCD current is NOT going through the SPD, all the SPD is doing is monitoring the voltage on the bus bar for spikes. Take a look at this other video of ours on SPDs, it will explain better. Use this link ... kzread.info/dash/bejne/dXeOrJJ8gLK4Yrg.html

Beautiful

@learnelectrics4402

5 ай бұрын

Glad it was useful. Dave.

Great video thank you! I've been told you can't fit an SPD on a TT system please can you explain why if it's true and if not do you have to do anything different for a TT system . Thank you

@jonathanfox1105

2 жыл бұрын

I’m not an electrician so take this with a grain of salt but: With TT systems and SPDs I believe you have the same problem that you always have with TT, i.e. there won’t be enough current flowing to trip circuit breakers in the event of live to earth faults. On TT I believe you can use a CT2 SPD without any further protection than the circuit breaker and that you can use a CT1 SPD if and only if there’s an RCD before it. If you are installing an SPD yourself make sure that you keep the leads very short ;-)

@learnelectrics4402

2 жыл бұрын

Thanks for the question. A TT system has a high resistance path and will not respond to surges the same as a TN system. See Jonathan's reply below.

@learnelectrics4402

2 жыл бұрын

Thanks again Johnathan. Great response. Dave.

@dobplastering8410

2 жыл бұрын

@@jonathanfox1105 thank you . I'm new to this and wasn't sure what's best practice.

Great video but it’s mainly the cheaper suppliers of SPD’s that require an MCB back up some don’t and free up an additional way on the board.

@learnelectrics4402

Жыл бұрын

Thanks for the extra info, thanks for watching.

Hi. Sorry for stupid question. But if you r board has an 80a supply for example and your connecting rcd 1 and 2 from top of SPD which goes through the 32a mcb which you’ve shown you’ve limited your board supply to just 32a? That correct?

@learnelectrics4402

Жыл бұрын

No. The SPD is only monitoring what goes across the top of it. The current to the RCDs and the rest of the board does not go through the spd. The SPD is effectively monitoring the bus bar. The 32A mcb is a recommendation to limit any spike current to 32A to protect the spd. Hope this helps.

@alanmarriott9216

Жыл бұрын

@@learnelectrics4402 Hi. Only reason is if you look at your picture of the DB you have a copper bus bar link from main switch into the bottom of the 32a mcb,then from the top of the 32a mcb which then goes across to the SPD and also the RCDs. So surely if it’s all through that 32a mcb that’s maximum your board will be pulling. I maybe be stupid

@AlizeeDanceForMe

Жыл бұрын

In the diagram at 8.20 I first thought that the whole installation was running through that 32A SPD breaker, but if you look at the live on the main switch, a brown cable comes from that, to the live on the SPD and to the two RCDs. So the SPD is in parallel with the the main switch and both RCDs.

Thanks David...Good video. Quick question... If the MCB protecting the SPD from a longer duration surge, was to trip, would this not just send the Surge back into the installation? I would have thought it better to let the SPD take all the surge and I wouldn't have thought the MCB was a good idea???

@jonathanfox1105

2 жыл бұрын

All devices can fail over time and if the SPD fails short circuit then you are risking fire without the circuit breaker (or taking out the main cut out fuse).

@learnelectrics4402

2 жыл бұрын

Thanks John, see Jonathan's reply below. Thanks for watching. Dave.

@learnelectrics4402

2 жыл бұрын

Brilliant answer Jonathan, thanks for the support. Dave.

@smd-tech

Жыл бұрын

From repairing power supplies from africa where there is a lot of lightning, MOVs frequently fail short circuit. If there is no overcurrent protection this could end badly.

I was investigating fitting a Lewden Type 2 SPD kit and they come with a 40A MCB as standard. This seems to conflict with the advice in the video to fit an MCB that is 32A max. The data sheet indicates the cable sizes are 2.5mm/4mm as described in the video. Surely a manufacturer wouldn’t knowingly sell a kit that didn’t satisfy the regs? Not trying to sling mud at anyone, just seeking clarification and reasoning. Any thoughts …

@learnelectrics4402

Жыл бұрын

Go with the manufacturer's recommendations always. You need an MCB that won't keep tripping every time a big spike arrives, but not too big that it never trips, Conversely, you don't want a 6A breaker that is always tripping. 32A and 40A are in the same ball park. Thanks for the input. dave.

Hello sir, if my appliance is working 240v max then if i install 275uc type1+2 spd.... Isit better than other spd thatwith type1+2 330uc specs spd?

@learnelectrics4402

2 жыл бұрын

Arun, you would need to compare the data sheets for both SPDs and decide which one suited your particular needs best. Thanks for watching. Dave.

What type of SPD should be installed in the main electrical cabinet of a residential home?

@learnelectrics4402

9 ай бұрын

In the Dist bd is usually a type 2. Thanks for watching, appreciated, Dave.

@pps.sks1985

9 ай бұрын

@@learnelectrics4402 thank you very much

Sorry in advance if its a stupid question - will the MCB powering SPD not get overloaded as everything else is powered through the SPD line terminal? It looks to me as it'll keep tripping on overload, is there something missing in the diagram? Or m I missing smth obvious.

@learnelectrics4402

Жыл бұрын

The SPD just looks at what passes across its terminals. The current for all the circuits does not go through the SPD, just passes across the top. Only when a spike of over-voltage arrives does the SPD suck that over-voltage through itself. The rest of the time it just watches. Think of a conveyor belt with small boxes on it. As long as the boxes are small, we let them go past us. If a big box comes, we take it off the conveyor belt and put it behind us. The mcb protects the SPD from prolonged over-voltages. Hope this helps.

@MustangGlos

8 ай бұрын

I agree, it looks like the entire CU current will flow through the MCB

Hi Dave, as always, thank you very much for your work. Do you recommend an online course for the C&G 2382-18 (in conjunction with your videos) and then sitting an 'in-person' exam post-learning? And if so, can you recommend any specific website for this? Many thanks,

@learnelectrics4402

2 жыл бұрын

Thanks for the feedback Kevin. Everyone learns differently. Some do well with on-line and others learn more with face to face. NAPIT and NICEIC do some good courses. If you go to an independent trainer, always visit and check them out BEFORE parting with any cash. Most are good trainers but there are some horror stories out there. And visit at least three centres before deciding. Its worth it to get the right training centre for you.

Is the surge module the vaiestor?

@learnelectrics4402

6 ай бұрын

The varistor part is contained inside the SPD and this will trigger when a certain size surge is detected.

Good video but you missed the information about how long the cables should be .

@learnelectrics4402

2 жыл бұрын

Thanks Andrew, thanks for watching. Dave.

Is the whole installation now protected by only a 32amp mcb?

@learnelectrics4402

Жыл бұрын

No its not, the 32A breaker is just protecting the SPD. None of the current for the other devices goes through the SPD, it just watches what goes across the top of it. Take a look at this other video on SPDs, it will explain exactly your question. Thanks for watching. Dave. Here's the link... kzread.info/dash/bejne/dXeOrJJ8gLK4Yrg.html

what is the differnce between type 1 snd type 2 SDPs?

@learnelectrics4402

Жыл бұрын

Several differences Imran. the amount of current and voltage they can handle. Type 1 are generally for protection outside the property where a lightning conductor is installed. Type 2 are usually installed at the installation source where it comes in to the property and where there is no lightning protection.

If the consumer unit is fitted with RCBOs is the installation the same?

@learnelectrics4402

Жыл бұрын

Yes. The RCBO will directly replace each MCB and negate the need for RCDs.

good demo and well paced

@learnelectrics4402

8 ай бұрын

Thank you, appreciated. Dave.

Hi David Good informative video however I think it’s not suitable for TT installations and T1 SPDS on a TT installation a T1 device has to be located as close to origin also the SPD would usually be installed prior to RCD as operation of RCD would prevent functionality of SPD. In addition to that the SPD will also have to be fitted with larger tails and cpc conductors and an OCPD usually rated at 63A or greater depending on manufacturer requirements. I think it would benefit views you cover TT requirements in greater detail or at least inform them that they require greater consideration.

@learnelectrics4402

10 ай бұрын

Good comments. Thanks for the input and thanks for watching. Dave.

Can we connect output of type 2 spd to neutral instead of earth?

@learnelectrics4402

10 ай бұрын

There isn't an output on an SPD. Just Line, Neutral and Earth, which should go to the appropriate terminals. Hope this helps.

@Charles.parker

10 ай бұрын

@@learnelectrics4402 Hello thank you for the response. By "output" I mean the line that will connect to earth bar

There is a lot of controversy over SPDs and AFDDs mainly the cost of the them and weather they are really needed in domestic installations? I have asked many times a simple question but no one has come back with an answer or area unwilling to answer because the question throws a spanner in the works ? So I try again , if lightning hits the main transformer at the end of your road or the overhead power lines , why is it a problem ? Ok you could loose the power in the hole street but how would it effect our house? Surely the short lived surge will only get as far as the DNO cutout witch will blow ? And the surge can’t go any further, Therefore an SPD is a pointless waste of money? Personally I think it should be a personal choice if a home owner want it or not, to make them mandatory is the wrong thing to do how many people can afford to have them not a lot. Fantastic video very interesting and informative as always Dave 👍👍👍👍❤️

@TheWebstaff

2 жыл бұрын

Yeah it's an interesting question. Makes me wonder how many surge protected devices basically do this in / on circuit? e.g. you could make a plug in device that does this at a socket and I wonder if those devices are actually doing this when they are plugged in. And as you say justification wise, I've seen two times when power spikes have clearly killed equipment and both we're direct lightning strikes to the building. Outside of this is would be very hard to prove one way or another if this device is actually doing anything. Anything I need protecting is on the other side of a UPS or at minimum a SPD gang or plug.

@TheWebstaff

2 жыл бұрын

So yeah double checked, most SPD power bars / extension leads do this at the plug so if you have one of those plugged in anywhere guess what you already have :) So if you want more protection just plug in more power bars.. ;D

@learnelectrics4402

2 жыл бұрын

Yes, lots of interesting discussion. The day will come when Building Regs say they must be fitted. I know the insurance companies are interested because they are insuring tech equipment and SPDs will reduce their liability. Good point Sean.

@learnelectrics4402

2 жыл бұрын

Lots of discussion Dave. No-one has a definitive answer but I feel they will be compulsory on new builds and board changes in the coming years. Thanks for the input. Dave.

@learnelectrics4402

2 жыл бұрын

Thanks Dave.

According to this all the power is going through the spd?

@learnelectrics4402

2 жыл бұрын

No, not at all. The SPD is in parallel with the other devices.

A little confused as to why the position of the spd doesn't seem to matter, but why do most innstallers and manufacturers now place the spds on the board before the main switch

@learnelectrics4402

Жыл бұрын

There are always new methods. As long as the SPD is installed where it can monitor effectively it will do its job. Thanks for watching. Dave.

👍👍👍

@learnelectrics4402

Жыл бұрын

Thanks, appreciated, Dave.

What's the point of mcb for that spd??.. if that trips all protection is gone

@learnelectrics4402

Жыл бұрын

The mcb protects the spd. If that trips the spd does not catch fire but all the circuits are still enabled and protected by their own mcb. Have a look at this video, it answers your question perfectly. kzread.info/dash/bejne/dXeOrJJ8gLK4Yrg.html

@giubaca

Жыл бұрын

@@learnelectrics4402 well there are out there SPDs which doesn't need protection, i.e. they are rated for 100A already. Installing an MCB in front of an SPD will render that SPD installation pretty much useless in the event of a surge especially when the surge protection is needed the most. So yeah don't use the brand which needs overcurrent protection

Why Neuteral 1 , 2 and the main are not connected together?

@learnelectrics4402

2 ай бұрын

The RCDs function by having separate neutral bars. Hope this helps. Dave.

Maybe I`m not quite getting this, but looks to me like the diagram shows the entire installation being supplied through the 1 32A MCB and the SPD? That can`t be right

@learnelectrics4402

Жыл бұрын

The mcb is just protecting the spd from overcurrent. Thanks for watching.

Surprised they haven't got a check 6 monthly spd sticker in the new regs

@learnelectrics4402

Жыл бұрын

Don't make them bring out another Amendment - please. Thanks for watching, appreciated, Dave.

On the final stage of the connections the live appears to connect to the Earth of the SPD

@learnelectrics4402

Жыл бұрын

Just the route the earth is taking behind the components. Great that you are studying it, appreciated. Thanks for watching, Dave.

In the video power drawing if the 32amp mcb trips no power to rcds There fore the whole installation is running off a 32 amp breaker Or am I blind

@learnelectrics4402

Жыл бұрын

The 32A breaker is there to protect the SPD only in case of overload to the SPD. The house current does NOT pass through that breaker, the voltage and current to all the circuits in the house just goes across the top of it so that the SPD can monitor the house electricity for spikes. Hope this helps. Dave.

@tonylockwood6370

Жыл бұрын

@learnelectrics4402 check your drawing

@mikedowney6777

Жыл бұрын

@@tonylockwood6370 no, he’s done it right - but if you pause video and look at it, it can appear wrong! both main RCD’s are supplied by the last cable installed - the brown conductor that comes out of the bottom of the main switch and runs up BEHIND the SPD - just unfortunate that if you pause it appears to connect in with the SPD ‘L’ connection (red loop at top)

@handsomedahn7614

10 ай бұрын

@@mikedowney6777 You are right.

@handsomedahn7614

10 ай бұрын

@@learnelectrics4402 thanks for the clear way it was explained

Great little video BUT slight problem with your connections! You show the live feeds to your RCD's taken from the supply to the SPD, this is incorrect as the whole installation would be fed via the 32A MCB feeding the SPD! The RCD's need to be fed from the main switch not the SPD....

@learnelectrics4402

Жыл бұрын

The 32A mcb is aN IET recommendation to protect the SPD as in theory it could take an unlimited amount of current until it pops. Hope this helps.

@LeeDunlin

Жыл бұрын

@@learnelectrics4402 No you miss my point, I know you need a 32A MCB to feed the SPD but on YOUR diagram see 8:20, you show the feed to the 2 x RCD's as coming out of the live in to the SPD which in turn has been fed from the 32A MCB, this is incorrect as the whole installation is fed now via the 32A. The RCD's need to be fed before the SPD MCB. :)