Cable size Circuit breaker amp size How to calculate What cable

[@GentlemanH]

Thanks for a clearly explained video. Just a point to remember when referring to a six millimetre cable it refers to the cross sectional area of the copper and not the diameter of the copper wire. Back when I started in home renovation, I would measure the copper wire with a vernier and then wonder why 6 mm was not the diameter ? Of course not - 6 mm refers to the area - it should be written 6 mm2.

[@danielteyehuago1633]

I agree with you. You did well for going extra miles

[@adam418g]

Thanks for the comment, makes sense ;)

[@bubazomo1993]

Though I am not an electrician by profession but I have been in the power industry for 5 years now. It is an excellent video for learners.

[@ez8294]

Helpful video. I'm level 2 electrical installation student . Can't wait to become an electrican .

[@ErenPlaysNsh1t]

Great video. Taught me more in 15 minutes than my place of learning did In 3 hrs.

[@TonyofCornwall]

One of the best and easily understood tutorials I've seen. Absolutely excellent 👏

[@tiezhongchi]

thanks to share the power cable information for tips . as an wire and cable making supplier in China that we learn a lot from your channel

[@volodimirdembitskyy6516]

Thankfully we got people like that to explain very simple ❤

[@steevek]

at 1:15 talk about cable size 6mm, 2.5mm and 1.5mm. Iit should be read as 6mm square, 2.5mm square and 1.5mm square instead. Many thanks for this video!

[@user-yh4kl3hx2o]

Your a legend no other words....amazingly trained and educated

[@MampsUK]

excellent video and very well explained I ve learnt more from home electrical wiring thanks to your video

[@PinoyElectrician-jr8bu]

Hi thank you for your videos. I am inspired. I am here in Uk for 3months and ongoing taking of NVQ. I'm electrician back home ( Philippines ) 7 years of experienced at the Philippines and 2 year's at Saudi Arabia. Sadly I can't apply for electrian here in UK without NVQ or gold card. 😅😅☺️

[@hank9965]

Good luck to you! I am a electrician from England but I'm living in Australia. I need to redo my training before I can do my own work in Australia as well 😂

[@edward_grabczewski]

I like this simple approach to calculating the design. I can't see a problem with using cable that's over-rated at is has less resistance and can cope with future changes to circuit usage. Diversity is an optional consideration if you don't want to spend too much on cabling etc. but it takes no account of future usage, so having larger cables is fine if you want to pay for it.

[@satish8299]

What do you mean take the "diversity" into account? Is that the tollerance of the cable? O you mean 1 usage of voltage between L1 and L2 ? He choose 230 Volt and that is between L1 and Neutral, so there is no square 3

[@eugeneoreilly9356]

Yes,it eventually boils down to cost.People often add extra loads to circuits without considering the cable power rating.

[@frankbumstead3838]

Well done, best technically designed and factual video on this subject.

[@KaVinceTV]

Sir thank you very much for the very clear explanation tutorials on how to calculate electrical wiring.

[@pah9844]

probably the best instructional video out there. thank.

[@232beachroad]

I am an electrician ,and on cookers you should allow for diversity , this is an allowance in the electrical ie regs, that means you would never have the cooker on full load ,talking the full 10kw while cooking ,( every oven and ring on full power) this means a 32A CB would be OK with 4mm cable for a short run and 6mm for a long run of cable.

[@user-yh4kl3hx2o]

No bro 6square only

[@ayvanmusa8515]

I did not get wy he counted the cooker fuse as 45A but in the schedule he put 32A?

[@kmalakhawlhring14]

Very useful.. Thank you so much, from Mizoram, Aizawl

[@abuanihas3pazg149]

I come back and rewatch this video again to remind myself, great video thank you

[@henrytagoe7268]

I have just watched the right video at the right time. Thank you for An excellent presentation

[@CarlosArruda77]

No mention of diversity for the cooker. Nevertheless very effective and easy to follow video. Well done buddy.

[@Vision267]

What is the diversity of the cooker

[@DavidBromley123]

A very simplistic look at the cooker circuit, you need to take diversity into account as the load is thermostatically controlled and therefore wouldnt pull the full load all the time.

[@eugeneoreilly9356]

You may not pull full load all the time.Pulling it for a split second will trip the breaker.

[@sivatec7852]

Thanks for your effort and a neat explanation for the beginners.

[@empratoreyaweb9003]

Thank you for yoir explanation, I only have one note: When you get the current you divided power over voltage without the power factor.. it should be P/(V*pf) so the current will be 48 A , then you should select a cable size according to that.

[@macspud28]

Interesting. I hadn't realised just how much running cables through insulated walls makes to the amperage rating of the cable. It's definitely, something to keep in mind when adding insulation to existing walls, ceilings etc.

[@electromagneticfousaivel9599]

Thanks you have excellent teaching skill

[@karimasad2094]

Thank you very much for your clear instruction and for following the regulations guidelines. I hope you can do much more youtubes about this subject. I have learnt lots from this.

[@curtisfrancis726]

Thanks I will also refer to my ref books Great video.

[@BAK87]

This is quite a broad topic. You managed to explain the most important parts, excluding the formulae. For heavier loads we (central Europe) usually use 3 phase circuits.

[@deanmark11]

he is explaining for domestic/houses

[@BAK87]

Most of the domestic-houses here DO use 3 phases + neutral. AC Voltage LN 230V, LL 400V, main fuses are 3 x 25A or 3 x 20A and current limiters inbuilt in the electrical power meter. Electric stove usually uses 3 phase, so does the heat pump, and other various bigger loads.

[@jacob.sumith]

very thorough and scientific.. learnt a lot.. got me thinking a lot more :)

[@chrischaralambous286]

Excellent explanation. Thank you for this educational video.👍👌

[@chrisroberts8745]

this video is brilliant / really easy to follow for anyone. thank you!

[@esky6930]

Very clear and informative video! Thank you!!

[@hanifosman8080]

Thanks for explaining this very clearly in this video. God Bless

[@mcgravelgravel5675]

very how you this video help me alot .thank you very much

[@waltermessines5181]

Very nice explanation, you make a great teacher; sweet memories of my work with some Polish builders because of the accent. :)

[@horatiofluffytop]

A really well presented and informative video, thank you.

[@geoffreybasiamisi2668]

thanks for the fantastic lesson, I'm in Botswana

[@kedzis]

cool music at the end, very useful info, thanks

[@mohanamapab6369]

your explain very excellent thanks lot

[@jupitermobile6984]

Very nice and easy to understand

[@SpainHighlander]

You are The Man ...many thanks.

[@wormwood6424]

Lovely easy to follow vid. Thanks!!

[@muhammadsaeed3854]

Very nice video sir thanks from Pakistan

[@shareefmohammed4317]

The best I had ever seen too much worthy . God bless you bro

[@mortenlund1418]

Thank you for a very good presentation. I am quite stunned about the wire size. Here in Denmark for a cooker it would be 3 phase and 400 V. The calculation would be like this: 10000 W / 400 V x 1,73 (square 3) = 14,4 Amps This will eventually lead to a 2,5 mm2 if it is not placed to hot. Quite a difference! It would be fused with a 3 phase 16 amp.

[@mortenlund1418]

Forgot to mention that the wire would be a 5 x 2,5 mm2 (3 phases, 1 neutral and 1 ground)

[@draganceros]

👏👏

[@satish8299]

@@mortenlund1418 But that cooker should allow a 3 phase connection? In the video he defined a 10kW cooker that works on L1 and neutral, other people mention "diversity factor" What is that?

[@satish8299]

Do you have a link to that book in pdf form or similair pages with the required tables?

[@antoniosmav.5865]

@@satish8299 this why the consumer has to check first the fuses wiring he has before buying an appliance

[@ahmedelectricianofiraq5550]

i now 1mm cu wire can hold max 8 amp without voltage drop 0.05% in lenth 100 meter and don't get hot so (1mm 8amp) , (1.5mm 12amp) , ( 2.5mm 20amp) , (4mm 32amp) , (6mm 48amp) , (10mm 80amp) , (16mm 128amp) and thanks for your great video.

[@firsteerr]

hold on , you should also take in to account the method of installation , the various conditions it will pass through (example , you may go through insulation and then into free air which operate at different temperatures

[@lewisedge3748]

Great video, easy to understand.

[@kangtheconqueror]

Hiya. I'm enjoying your videos Buddy. Just thought I'd mention it, as you did choose to use a cooker as your example. Don't forget to apply diversity as it is highly unlikely to ever reach its maximum demand due to the thermostats in the cooker rings. In your example (44 A) it would be the first ten amps (10 A) then 30% of the remaining amps (approx. 11 A) PLUS 5 A if there's a socket outlet on the cooker isolator. So, your 44 A has gone down to 26 A. The next MCB up from that is a 32 A. I'd still use 6mm cable though.

[@cater4anytink45]

Kevin McNicholas I've always been told to use 10mm by my boss..I suppose this would save money if working for yourself.. I've recently sat the 2391-52 exam,no one could give me a exact way too work out maximum demand/ diversity nt even in bs7671 book

[@kangtheconqueror]

cater4anytink Yeah, I know what you mean. I suppose it would be useful to if the oven was ever upgraded again. It's a trade off though, isn't it? If customer wants to pay for cable that is far and away able to deal with the demand, fair enough. Thing is though, why don't we do rings in 4mm instead of 2.5mm? Because of cost, that's why. And if your wiring a lot of houses that's going to be a lot of wasted money. If customer is willing to pay the extra i.e. maybe £45, let's say, instead of £30 then yes, do it in 10mm. Diversity is covered in the On-site guide.

[@smartchip]

cater4anytink checkout the best sparky in the U.K. he knows the regs in his head, can tell you the reg and the page its on, his name is john Collins, his training place is in dudley West Midlands, he is a great trainer, he used to teach at sbc college, he teaches in small groups, like two! On different meters, as everyone has different meters, etc, everyone knows him, especially the regs guys, ex military,

[@kangtheconqueror]

smartchip John Collins? Ha, ha... you mean 'Johnnie Ace'!! Oh, he's great. I love watching his vids. Very knowledgeable and puts things over in a way anyone can understand. Johnnie Ace, (tsk,tsk), is on the case. That's a great catchphrase. 👍🏼

[@stevencorbin103]

smartchip what's his youtube page. Cheers.

[@adamjarosz5558]

prosto i konkretnie....tak trzymaj

[@lomx]

Brilliant video, very informative. Thanks!

[@fionafarrow5948]

Great video. Thank you for taking the time to make it.

[@sayyidtawaqal1754]

Thank you brother can you please help me with this knowledge I'm said from Zanziber in Tanzania

[@stevendavies4572]

Brilliant video.well explained!!

[@gassafe9810]

You forgot to take into consideration diversity, so take the first 10A and 30% of the remainder = 10 + 11.33 = 22.4 A approx , so theoretically 2.5mm would suffice if on a type B circuit breaker, 4mm to be safe. ( 6mm cable comes from the old days on semi enclosed fuses - where the correction factor pushed up the requirement for a larger cable)

[@satish8299]

The what? The diversity ? you mean tollerance ? I dont understand that 11.33 A

[@septin2008]

You have to assume that not all the burners and oven etc in the cooker will be on at the same time and draw full current. So we diversity meaning an average current that would be use so 10000/230 = 47amps,take 10amps out will leave 37.then you have to take 30% of 37 which is around 10 or 11 and add back the 10amps that you took earlier and will give you around 21amps. In this way you can use 32amps mcb and a lower siZe cable.

[@jamalkhan1974]

@@septin2008 I think Diversity is ONLY used to calculate the overall current demand of current in the house to see if the demand goes over 60 or 100 Amps etc. If you you diversity for calculating MCB and cable size, you would end up tripping MCB whenever you use the full load (xmas cooking etc) or if you had a bigger MCB but a small cable, then cable will burnt down when full load is used......

[@badfairy9554]

@@septin2008 I was told to get a 4mm.

[@houssamghabra7222]

great video, that was big help to me .... BIG LIKE

[@jamz0nbread]

Beautiful explanation boss

[@SilasWanyonyi-o1w]

I am interested with your lesson iwould like to be your new student

[@kwameg.114]

Thank u,, very clear explanation

[@callmejt2407]

Great video this will defo help with my studying

[@jeetenderkakkar7570]

Studing

[@Andrew-bl2vo]

Easy! You get trained as a electrician, and it comes with experience and knowledge! Unfortunately my "trade" appears to be a free for all know a days!! (28 years in the trade)

[@theinstallerguy786]

Andy RC exactly, this guy is probably a part p trained jack of all trades, master of fuck all. Get him to explain diversity, rule of thumb or even the adiabatic formula lol

[@jonanders76]

Haha, they're hardly difficult to understand, diversity & the adiabatic equation that is. And "rules of thumb" mean they don't have to be understood, just like for example, the standard circuit arrangements the guy shows at the end of the video. You could quite easily teach yourself how to install and test basic domestic electrical work in a couple of months...its not rocket science.

[@theinstallerguy786]

jon A I certainly wouldn’t want someone teaching himself electrics in my property. I do what I do because not only am I competent and experienced, I also have 9 city & guilds qualifications including the 2391. I’m also insured and have professional indemnity cover. Part p is one thing, but someone not knowing their limits is another.

[@jonanders76]

Why would someone want to learn electrical principles or inst tech in your property? They could do it in there own property by reading books and using the internet. Wow 9No C&G multiple choice exams nice one. Oh and 2391, written or multiple choice? Part P is part of the Building Regulations, its not a qualification. C&G, NVQ etc are really poor quality exams and very easy to pass without a course. A milkman could pass the NVQ 3 and my elderly neighbour could pass the C&G 18th Ed Regs exam with a little coaching. Insurance is cheaply bought also. So your point? Limit? Standard circuit arrangements, paint by number, easier than laying laminate flooring or painting a room...thats why I do it.

[@theinstallerguy786]

jon A 2391 written. I haven’t done the part p as I’m in Scotland and the regs have always been superior to that of across the border.

[@sergekataraka]

Thanks for the clear explanation

[@fahedzahran]

very useful, easy to understand, and answered all my questions. thank you so much.

[@captainselly9419]

Excellent video, thanks for sharing. I have a question if you don’t mind please , cooker 10Kw is it per hour ?

[@gazmendnamani1457]

One thing to remember regarding cookers... If it is a three phase connection than that 44 is divided by 3, which means you can connect each of the phases separately and the cable size does not have to be bigger than 2.5mm and size of three breakers collectively has to be 20 Amps each (44x1.25=55÷3=18.33)

[@badfairy9554]

After waiting two weeks for a new cooker from a place that has the same name as a god, I paid for it to be put in. A bit more than £100. They said they could not do it. That I can only have a cooker thats 20 amp. I did not watch them try. My lights went off and on many times. So I went to see what the hell was going on. My fuse box says 32A . I have to wait 30 days to get my money back.

[@paulmathias1908]

Very informative, really good explanation. Thank you.

[@eugenepohjola258]

Howdy. Nice presentation of rating the thermal overload case. There is, however, another equally important aspect. The short cicuit case. There must be enough "short force" feeding the breaker to enable fast breaking (=magnetic triggering) of the breaker. In my location the power companies will provide information of how much short current is available at the service cable junction. From this point forwards one must calculate the short current at the most distant appliance or socket and choose a breaker that will fast trigger. If the short current is too low to deliver fast triggering the short current will flow until the thermal breaking happens. The socket wiring will run way too hot and there is a real fire hazard present. Regards.

[@ElectroDUBAI]

Good Content shared by you for us guys

[@NoIDa-cq6jh]

Very helpful video. Thanks for your time to put this together

[@austigm3888]

Thank you very much for the up to the point video. thumbs up man.

[@cpov8586]

Clever & superb presentation.

[@xXxserenityxXx]

Not to nag but that percentage difference is 4.44%. Great explanation and use of examples.

[@ElectricEssenceLtd]

Great Video. Thanks for taking time out

[@scottsaul]

New subscriber thanks its all coming back to me😂

[@ricard16]

Great videos, explain them clearly for all to understand 👌

[@Mini-jl9jr]

Nice video and very helpful information thank you so much sir

[@azimkure9323]

Thanks for the information cable

[@badfairy9554]

You should teach at college, Brilliant video mate,

[@nortaviaatpl8687]

Simple presentation but accurate

[@hancecrawford]

Very important to use the right size of cable for the proper job :)

[@perez7uhfelix428]

Great video.... very helpful thanks

[@carlwithers3986]

very good mate well done, this will really help people

[@barryjdwyer]

Excelent info and concise! Thank you!

[@carlosjimenez3985]

Thanks for the video. Can you please change the music? Something more pleasant to the ears?

[@moisesmeca5694]

Thanks for sharing it help a lot God Bless

[@60andUP]

Excellent video

[@johnstancliff7328]

the same applies in the North America market. the only thing that different is the sizing, Europe used the Millimeter system, and we use the AWG system, American Wire Gauge. here the rule is 14 gauge= 15 amps, 12 gauge=20 amps and 10 gauge= 30 amps.

[@boualemstihi5349]

Thank you so much for this video. Am just asking what about 1.5kw here which cable I can use it please.

[@ateleskier7066]

Top marks! Excellent video - very clear. Will check out your others now. 👍

[@650GSF]

that book would be a good investment.

[@eeeknowledge2850]

Informative video about cable sizes

[@Soliafra]

You did great explanation 👍🏼👍🏼

[@ek6868]

Good interesting video 👍👍👍

[@Biggles83]

Another brilliant video.. Great stuff

[@soaresferdinando4151]

That book is useful I'm gonna have that book but I would like you to explain more about that book Thank you, Sir👨👨👨

[@deanmark11]

thanks for the upload very informative

[@ssarraf6855]

Thank you for the presentation. Would you please add the equivalent “gauge” size of the cable as it is used in the US THANKS

[@somunmiah3475]

Good i like your video

[@mohanamapab6369]

wow very nice vedio tq

[@Mr.Therapist1]

'Very Very excellent' indeed.

[@davidbrewer7937]

You must also remember that current ratings for wires depends on their situation & bundling. This is because cables dissipate heat under normal operation & constricting those cables or clipping them tightly has a different effect than their ability to dissipate this heat as does their placement in insulation vs hanging in a free ventilated area....In short, it is best to select a cable for the application with the matching breaker which is at least 30% larger than the worst case scenario of the application.

[@tmengistu1778]

Great thoughts!