I have only been on the trade for 6months but the knowledge that am getting for this channel makes people that I work with think I have been on the trade for years, thank you guys for making my journey so easy.👏🏿👏🏿👏🏿👏🏿👏🏿
@efixx
4 жыл бұрын
Thanks - any ideas for content to make your colleagues amazed at your knowledge just drop us a line.
@triplerjm2353
4 жыл бұрын
efixx, the use of ferrule, types tips, wago 221 and the 5 great products for Electricains to use during first fix, also the wago 224 when installing the Downlights,,, the work efficiency and the speed that I have produced during the task left them in sock. 👏🏿👏🏿👏🏿👏🏿👏🏿👏🏿
@wallbouncer9655
5 жыл бұрын
I love the 2 camera views used in this video. Great work I now know more about what’s inside an SPD 👍.
@Ghbarl
5 жыл бұрын
Great videos Guys. Really informative and professionally done. Would be great to understand why there’s a need for the two different technologies in each of the SPDs.
@efixx
5 жыл бұрын
Hi. We are working on other videos on SPD’s. Thanks for commenting and watching Gaz 👍
@seanpassant3174
4 жыл бұрын
The GDT acts in the same way as a spark gap, so it is voltage switching rather than voltage limiting. The difference in the neutral phase in this device indicates that it is suitable for a TT earthing system, devices for TNC-S/PME application would have the same for all phases. The circuit diagram from a Dehn type 2 device here shows the TT version: www.dehn.co.uk/pdbRes/DE_EN_Web-UK/1628/33274/Img/12995321/952115p.pdf and here it shows the TNC_S version: www.dehn.co.uk/pdbRes/DE_EN_Web-UK/1628/33274/Img/12995264/952205p.pdf feel free to contact us if you require any further information: info@dehn.co.uk
@nusermane1076
2 жыл бұрын
@@seanpassant3174 thanks for the explanation! Can you explain it again and tell the physical/circuit-level reasons that there are two different elements in use? What is the circuit level reason for the one or the other element being used depending on the electrical system? What’s the difference between voltage limiting and switching? Is limiting just like keeping the voltage at the standard level and is switching like dumping nearly all voltage to the cpc level, since the GDT becomes highly conducive?
@seanpassant3174
2 жыл бұрын
@@nusermane1076 There would be an issue with earth leakage in the neutral phase so you need a discrete component that prevents any earth leakage, so something with a physical gap, either spark gap or GDT. MOV's still allow a small amount of earth leakage so that cannot be used in the neutral phase of a TT device. The difference between the two technologies when it comes to the actual surge protection is that a voltage limiting device (like an MOV) has a present level of voltage that it allows through and it effectively 'clamps' the voltage to that level (typically tis would be around 1500v. A voltage switching component acts more like a voltage driven switch and shuts off the voltage so the total amount of energy through those is far lower than through an MOV. It makes it sound like an MOV is not very effective but it's more complex than that because MOV act a little faster and typically will have a slightly lower voltage protection level (the voltage at which the device will start to work). Both technologies have their respective merits. For type 1 (lightning arrest devices) spark gaps / GDT are the better options for type 2 (switching surges & transients) an MOV is probably a better option. I hope that helps?
@vievlogs589
5 жыл бұрын
Another quality video lads 👍
@DanSeaber-Shinn
5 жыл бұрын
Loving these new videos guys! 🙌🏻🙌🏻
@efixx
5 жыл бұрын
Hi Dan. Thanks for the support Gaz 👍
@richardwash6678
5 жыл бұрын
Nice one Gaz and Joe, good explanation. 👍
@efixx
5 жыл бұрын
Thanks Gaz 👍
@willipine1863
4 жыл бұрын
I just learned the science behind it,, i thought we should connect it like mcb but its a surge protection and like a lightning arrestor on H.T line sends excess power to earth ,, so a very good earthing is also required
@gbelectricks
4 жыл бұрын
Hello both, just a quick heads up, at 2.53 you say the left hand module bridges between the line and earth terminals. In actual fact if you bell the base unit out the bridge is made between the live and neutral terminals (not live to earth) on the left hand module. The right hand module bridges between neutral to earth. Great videos though👍
@Eldho_George
Жыл бұрын
Are you sure? I was having this doubt. Thanks for clarifying
@Eldho_George
Жыл бұрын
Do you know the internals of Type 1+2 spd? Is it better to install Type 1+2 or separate Type 1 and 2
@Jay-fp8iy
2 жыл бұрын
Great video chaps. Love the effort as it really helps with my apprenticeship even down here in Australia. Cheers
@efixx
2 жыл бұрын
We love our friends down under 👍
@delspark
5 жыл бұрын
Thanks very interesting 👍
@Ressy66
5 жыл бұрын
Great vid, thanks for showing us what's inside, one question though, why the two different technologies?
@doctorelectric470
5 жыл бұрын
that's what I thought, why can't they just use the same for both modules?
@efixx
5 жыл бұрын
Hi. Joe is do some extra research... we have other SPD videos coming out soon. Thanks for commenting and the support Gaz
@seanpassant3174
4 жыл бұрын
See the reply above, the different device (the GDT) is for the neutral phase on a TT device, in a TNC-S device it would be the same varistor.
@silasketgaskets8709
3 ай бұрын
great teardown and explanation. is a SPD necessary if there is an under current overcurrent protector? If trying to protect a residential refrigerator pcb/compressor and split aircon compressor/pcb which is better, SPD or undercurrent overcurrent device? Is it ok to use a single device to protect entire house or separate devices for each aircon and refrigerator? Much thanks in advance.
@adrianbotos2819
10 ай бұрын
Great video! Is it recommended to use an SPD for an air source heat pump ? Single phase, max 15A. Thanks.
@lordbyrom100
Жыл бұрын
Rcds are checked regularly by the house owner as they were told to do by the electrician they are never forgotten about so having A S P checked will be the same no doubt .....I wonder if there is any connection with the possibility of power outages which may induce high voltage spikes ....no I'm sure that's not right ....some people think I'm sceptic I suppose
@davidniquot6423
2 жыл бұрын
Nicely explained, thanks.
@petermontgomery85
2 жыл бұрын
I understand that most sensitive, modern equipments are powered with smps. As these are fitted with surge protection at their mains input filter the only reason, that I can see, is that spds, are fitted to power distribution boxes, is to protect the wiring insulation, from any voltage spikes, that occur above the maximum rating of the cable.
@efixx
2 жыл бұрын
The MOV devices contained in power supplies can only handle a small amount of transient power.
@piney6587
5 жыл бұрын
Another informative video, thanks guy's. I see you have some dno style mainswitches with SPDs fitted any chance of a video showing the various fitting options of SPDs. Also other than private supplies I think type 1/2 should be DNO responsibility to fit at each point as 443.1 refers to effects from origin. private supplies which you have your own hv/lv transformer should be your own responsibility.
@efixx
5 жыл бұрын
Some good points raised here Jason, we'll keep it in mind for future content. Thanks for commenting!
@nusermane1076
2 жыл бұрын
Great video, but how is the energy produced, which is needed, to melt the solder joint in order to release the indicator? Will the protective element turn into a short, after the last surge it can take passed by, and hence overload the joint? Or will the last surge itself overload the connection? If it’s the last option, wouldn’t that have the risk that not the whole surge is consumed by the device, before it dies? How ever, good video, keep going!
@seanpassant3174
2 жыл бұрын
Typically the indicator window is triggered by a simple build up of heat. An SPD that does not have this function could get into 'thermal runaway' so this little function uses the build up of excess heat to trigger the 'warning flag' and puts the SPD into a safe open circuit condition. If you didn't have it the heat would continue to rise and a fire could be the result. Type 1 & 2 SPD's are in parallel so under normal conditions they see no load. They operate incredibly quickly (often under 25 nanoseconds) and create a short circuit to earth to 'dump' the excess voltage. If the device fails it fails open circuit so it's relatively safe as it's in parallel and the thermal protection will help to prevent any fire. It should be remembered as well that the devices have to be tested & proven to be able to deal with 20 surge events (if the meet the IEC 61643 standard) so they are not one hit wonders, a well selected & installed SPD should offer a lifetime of protection.
@ashmanelectricalservices4318
5 жыл бұрын
How often should you inspect the SPD?
@efixx
5 жыл бұрын
Great question Alvin... well we didn’t inspect/test our RCD’S every 3 months and now we don’t inspect/test them every 6 months for me I would wire an Indicator in circuit. Thanks for the wonderful support as always. Gaz
@Eicles
3 жыл бұрын
Very informative video. Just wondering though, why different types of device are used for line and neutral?
@seanpassant3174
2 жыл бұрын
Earth leakage. The neutral phase of a TT device needs to prevent earth leakage and an MOV doesn't so it needs to be a different component like a spark gap or GDT
@alessiopollero498
2 жыл бұрын
Hi, I was wondering what is the difference between an SPD type 2 device like the one shown in this video and an MCB with under voltage and high voltage protection? Do I need still to install an SPD Type 2 device even if I have an MCB with under voltage and over voltage protection installed ? Thanks.
@efixx
2 жыл бұрын
The type of protection offered is different. Over / under voltage is to protect against the supply voltage going above high or low limits. Surge or transient protection is designed to dissipate high energy pulses following a transient event - such as switching a large inductive load or lightening strike energy induced in to power cables. - check out our free training course which explores this - www.efixx.co.uk/Know%20How/BS7671SPD
@samu-me5qp
10 ай бұрын
how much temperature affects the solder?
@Bodragon
4 жыл бұрын
Why have a different type of surge arrester on the line than on the neutral ? Why not have varistors on both the line and neutral ? Or gas discharge tubes (GDTs) on both conductors ? And since there are both different types on the line and neutral, why the varistor on the line and the GDT on the neutral ? Why not the other way round ? Thanks. >
@ChumpusRex
4 жыл бұрын
Varistors instantly stop conducting once voltage drops below threshold (i.e. as soon as the surge has passed). GDTs continue conducting until current flow stops - if connected live-neutral, the mains voltage will keep current flowing through the device overloading it. GDTs are significantly cheaper than varistors, so it's no surprise that they are used where they are suitable, and the varistors only used where essential.
@ahmadhaziq6484
2 жыл бұрын
Im not clear . What the blue component? Is that MOV ?
@samu-me5qp
10 ай бұрын
yes metal oxide varistor. mostly used zinc oxide varistor
@mattcooper423
4 жыл бұрын
i wonder how effective they are on a TT system, if there was a fault on the lines , say a transformer failed or someone messed up in the sub station & sent 1kv down the line, 1kv to earth on a TT , would probably end up making all the bonded metal work live in the house as a typical rod 100-200ohms wouldn't get rid of 230v let alone more.. could it not make a shock risk in some instances? as it wont disconnect the power , specially if its on the main switch side? - and in terms of a lines lighting strike , ive seen what it can do to a house, a SPD wont stop it, would blow it right out the box, if it can jump the air, its not going to be fussed about jumping a SPD
@seanpassant3174
4 жыл бұрын
So type 2 devices are not designed for direct lightning strikes, for that you need a structural lightning protection system and type 1 devices (which are lightning rated). You can get SPD's specifically for TT systems (In fact the one in this video is specifically for TT hence the reason it has a varistor in the live and a GDT in the neutral) installing an SPD NEVER makes a system more of a risk, all the risks you describe would exist if the SPD were not there. The SPD is an over voltage protection device, it deals with very high frequency, high voltage, short term events. It makes systems more reliable not less reliable.
@romantrembakov4625
5 жыл бұрын
Hi, guys! Why wold't you tell about average life-time оf MOV (oxide varistors) SPD's? I mean how many years it works before it to be replaced of course if SPD was not killed by lightning strike or over-voltage waves?
@seanpassant3174
2 жыл бұрын
If the SPD meets the IEC 61643 standard then the testing & development required means it has to be able to deal with 20 'events' but the size & frequency of these events differ from country to country so it's very hard to put a figure in years as to how long and SPD will / should last. In the UK (where I am based) a well selected & installed SPD should last a lifetime because we have relatively little lightning (though of course it's still a risk) and we have a pretty stable supply grid so your SPD could easily last 15-20 years BUT..... in a country like South Africa where they have a lot more lightning, a far less stable grid, load shedding issues etc an SPD may only last a few years. There are other issues that come into it as well, a poorly installed SPD will not last as long so remember to keep all the cables as short and straight as possible. Make sure the earthing is good and ensure that you purchase a decent quality device that complies to IEC 61643 (or the local equivalent - here in the UK it's BSEN 61643) and make sure you properly read and follow the installation advice in section 534 in BS7671 18th edition and any manufacturers instructions.
@Bodragon
4 жыл бұрын
(8:47) - It looks to me like it may well be possible to put the line module into the neutral receptacle (and vice versa) simply by inserting it upside down. >
@mickwilliams2501
4 жыл бұрын
Hi why is there a tube in the neutral and not in the line . I get how they work just wonderd
@alunroberts1439
4 жыл бұрын
So what is it using if there is a low leakage current what is the running cost over the life time
@efixx
4 жыл бұрын
The leakage current is really tiny. Most electronic appliances have an SPD fitted at the input also. www.efixx.co.uk/Articles/surge-in-demand
@abscomm
5 жыл бұрын
11:38 Isn't neutral connected to earth anyway?
@ningis21
4 жыл бұрын
I notice that in the Wylex board shown in the video...the SPD is connected to the output of the main switch, working on the premise that a surge is present or has been detected, why doesn't the surge flow along the other equipment on the consumer unit busbar that is also connected to the SPD via a cable? The Over-voltage would flow equally to the SPD and circuit fuses..wouldn't it? especially as the two, (SPD and Busbar) are connected at the exact same Line point. How does this protect the rest of the circuits from the over voltage/surge? One would think that the tails entering the Consumer Unit would need to be monitored for a "surge" then some intervention (triping of a fuse/MCB/RCBO etc...) would occur to protect the rest of the installation. How does this SPD device stop the surge from travelling along the Busbar to all the other circuits, at all?
@seanpassant3174
4 жыл бұрын
SPD's operate very quickly, in this scenario typically in under 25 nanoseconds so the SPD detects the transient, triggers, opens a temporary short circuit to earth, dumps the extra voltage and then shuts again all in under 25 nanoseconds. This means that the other LV equipment won't even realise there has been an transient event by the time the SPD has quenched the surge.
@ketas
4 жыл бұрын
"i can feel it coming"
@efixx
4 жыл бұрын
Ha ha - thanks for that -we’ll keep that for our bloopers reel!
@johnburns4017
4 жыл бұрын
Are SPDs mandatory under the 18th edition?
@seanpassant3174
4 жыл бұрын
Technically no but it's virtually impossible to find a scenario where they are not required. There are 4 categories where installing them are mandatory (see 443.1 - 443.5) anything else must have a risk assessment, you can elect not to do the risk assessment but if you do then the SPD does become mandatory. When you do the risk assessment you will find that unless you have a small domestic application that is fed via an underground supply cable then you will almost always need to install the SPD. Add to that the requirement to consider the financial risk/reward of installing or not installing the SPD and in most homes a £50 single phase type 2 will be protecting several thousand pounds worth of equipment (TV, X box, dishwasher, tumble dryer etc) so whilst not specifically stated as mandatory there are very few scenarios where you would not now install one.
@johnburns4017
4 жыл бұрын
@@seanpassant3174 So essentially you are saying these must be installed on new installations. Unless a risk assessment says _no._
@seanpassant3174
4 жыл бұрын
@@johnburns4017 essentially John yes. 4 mandatory categories where a risk assessment is not required, you just install the device and then everything else must be risk assessed and 90% of the time it will prove to be needed.
@alunroberts1439
4 жыл бұрын
Am puzzeld the N an E on my house TN-C-S it is linked
@stunimbus1543
2 жыл бұрын
so clearly anybody buying these things is being ripped off. Paying a high price for a device with very little inside.
@johnpaulirvine5845
3 жыл бұрын
So the 'consumer' who will be the proud owner of the consumer unit will know to regularly check the SPD for any defect at the same time as they do the quarterly test of their RCD devices... then they'll pile the coats back in front of it all, while smiling to see their equipotential earth bonding cables keeping them safe should there be a problem with the distribution network... I can't wait until we upgrade the consumer units to be meteor-proof, because you can't be too safe...(yawn)
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