Diversity and Maximum Demand in Electrical Installations.

Being able to calculate and understand the difference between diversity and maximum demand is an important skill for all electricians.
It will avoid overloading the main fuse, with all its problems if this happens, and it will also avoid unnecessary upgrading of equipment.
This video looks at two very different dwellings to show the factors to take into consideration and demonstrates why we should not just apply a blanket diversity to every household.
The calculations for each circuit type are demonstrated and worked through as understanding diversity and being able to calculate maximum demand is an asset to every electrician.
This is video No.59 on our KZbin channel where we have videos on a wide range of electrical topics.
To view all our videos click on this link … / @learnelectrics4402

[@learnelectrics4402]

SEE ALL - To view a list of all our LearnElectrics videos, click on the link below. There are many videos on many electrical topics including Installation, Part P, 18th Edition, Testing, Certification, Lighting, Sockets, Ring Circuits and much more. kzbin.info/door/YaJQnpO4XAp0yCgqzMkmfA

[@danielteyehuago1633]

You can the best channel so far

[@pasqualeamabile5672]

Your explanations are much easier to understand than college, thank you Dave .😊

[@learnelectrics4402]

Thanks. I try to keep the videos to one subject at a time. Spread the word. Dave.

[@steveokinevo]

Thanks dave another class video, started throwing a link to your channel around some of the other elec sites on youtube, hope it helps man worth a go anyways. Your material is priceless mate your channel deserves more, steve.

[@learnelectrics4402]

Thank you Steve, every little bit of assistance helps. Lots more to come. Dave.

[@lucapuzzoli8363]

Thank you Dave.Your level of teaching is simply amazing

[@learnelectrics4402]

You are very welcome, thanks for the comments. Really appreciated. Dave.

[@stonegrundy123]

The clearest explanation of an often confusing subject. Thanks

[@learnelectrics4402]

Glad it was helpful, thanks for watching. Dave.

[@pooley2853]

Absolute legend thanks again Dave. Another very informative video. Your students are very lucky to have you.

[@learnelectrics4402]

Thank you so much. Great feedback and appreciated. Dave.

[@babangidaciroma4491]

Great presentation as always, thank you DAVE, you make me love my job as an electrician and adding more knowledge to my mental tool box

[@learnelectrics4402]

Thanks for the support. Its a good trade and kept me occupied for over 40 years, took me all around the world working on some amazing contracts. Dave.

[@bradleypyewell8986]

Absolutely incredible video and so easy to understand. Thankyou

[@learnelectrics4402]

Glad it was helpful and appreciated. Dave.

[@user-qi8tv2sj4m]

I know a lot more now thanks to your videos. The best way to learn they are better than the college. Keep making more

[@learnelectrics4402]

Thanks, will do, and thank you for watching.

[@wildboy1983]

I am studying towards my domestic installer and I found that the course I am taking completely lacks most of your excellent content. I would be happy to donate/gift towards future videos as I am sure your channel has made the difference between being successful in my new career. Thank you

[@learnelectrics4402]

That's nice of you to say, thank you. Just enjoy the videos and keep learning, its a great trade to be in. It's taken me all round the world over the last 40 years plus. Dave.

[@tonyp2878]

You are number 1. Number 0 if it was possible! Thank you a lot !

[@learnelectrics4402]

Thanks Tony. Appreciated. Dave

[@joshwilton565]

This video has been very helpfully, I’m very grateful

[@learnelectrics4402]

Glad it helped, thanks for watching.

[@no_short_circuit]

Thank you again - a complicated topic simplified very well.

[@learnelectrics4402]

What a great compliment, thank you. Dave.

[@rri7534]

I agree he is an excellent teacher! 👍🏻👏🏻👏🏻

[@abrehamish]

Thank you Dave. Enjoyable and informative video.

[@learnelectrics4402]

Super. Glad you enjoyed it. Keep watching, lots to come.

[@musangobi2079]

I appreciate your effort, Dave keep it up

[@learnelectrics4402]

Thank you Musa, great feedback. I hope you are doing well, keep watching my friend, lots more videos to come. Dave.

[@mb-electricalservices]

The one I have been waiting for. Thank you. 👍

[@learnelectrics4402]

Well, we got something right then. Glad you like it and thanks for viewing. lots more like this to come. Dave.

[@sygad1]

Really good video, you explained it very simply. Thank you for making and sharing

[@learnelectrics4402]

Glad it was helpful and thanks for the support.

[@highhurstfarmandholidaycot526]

Very good presentation-many thanks.

[@learnelectrics4402]

Glad you like it Andy. Thanks. Dave.

[@howarthelectricalltd.356]

Thank you Dave, great work. 👍

[@learnelectrics4402]

Thanks for the positive comment. Very much appreciated. Dave.

[@zed.kelectrical8741]

Thanks again.. for a very 'user friendly' explanation.. works for me .. lol Cheers.. 👍

[@learnelectrics4402]

Great, if it helps, it has achieved its goal. Thanks for watching. Dave.

[@johnkeys368]

Always clear and concise explanation

[@learnelectrics4402]

Glad you liked it John, much appreciated comment and thanks for watching. Dave.

[@richardrobinson5166]

Poor Mrs B..... she's a slave to her kitchen 😂😂 Great video, I really like the simple way you explain things 👍👍

[@learnelectrics4402]

Thanks Richard, I appreciate the support. Dave.

[@Oufg103f]

Great video 👍, I hope this comes up in c&g2396 and will use a similar explanation. 👍

[@learnelectrics4402]

You never know Chris. Thursday's video is about Adiabatic Equations, and you nearly always get a question or two on that. Keep watching and good luck. Dave.

[@abdirizakhassan1073]

Thanks great video and helpful

[@learnelectrics4402]

Thanks for the positive comment. Much appreciated. Dave.

[@benjamintomlinson1139]

Many thanks Dave

[@learnelectrics4402]

Thanks for watching Ben, much appreciated, Dave.

[@ramphago1240]

Thanks it is very helpful

[@learnelectrics4402]

Happy to help Ram, thanks for the support. Dave.

[@krazylad84]

Thanks again!

[@learnelectrics4402]

Brilliant, thanks for sticking with me. Appreciated.

[@franciscogago5961]

Excellent

[@learnelectrics4402]

Thank you so much, appreciated.

[@franciscogago5961]

Thanks

[@learnelectrics4402]

Glad it helped. Dave.

[@seanforder8824]

Thankyou !

[@learnelectrics4402]

You're welcome, thanks for watching. Dave.

[@KarlPior]

Excellent 👍

[@learnelectrics4402]

Thank you, appreciated. Dave.

[@guleed6690]

Wonderful

[@learnelectrics4402]

Thanks for watching. Dave.

[@kingofthetrowel1725]

Nice one dave 👍 love this channel even a non sparks like myself finding it so interesting 👍 what other videos will be coming up soon dave? Would you do one on different types of cable in domestic houses right from old to new stuff, it would be brilliant to see how it’s changed over the years

[@learnelectrics4402]

That's a possibility, different cabling colours, sizes etc. Coming up? A whole variety, part P, Test and Inspection, RCDs, PAT Testing, and loads more. Plus the weekly 18th Edition series on Thursdays. You keep watching them and spreading the word and we'll keep making them. Thanks. Dave.

[@kingofthetrowel1725]

@@learnelectrics4402 nice one dave brill! 👍👍🙌🏻🙌🏻

[@learnelectrics4402]

You're welcome.

[@lanceeaton2812]

With the introduction of low wattage LEDs for our lights 100W per lamp seems excessive. Great video.

[@learnelectrics4402]

The Regs require us to calculate for 100W per lamp holder if its possible to install a 100W lamp in it. Some modern lamps will only fit in unique to them lamp holders in which case you can reduce the load accordingly. Good question, thanks for watching.

[@frxcryptotradesmen5306]

Brilliant

[@learnelectrics4402]

Thank you, great feedback. Thanks for watching. Dave.

[@leebond1837]

In relation to cable calculations, can anyone clarify for me whether you apply diversity before or after you work out In? Because the way we do at my college is to work out your In from your Ib but surely if you do that and then go on to apply diversity after cable selection youd potentially have use a lower rated circuit breaker?

[@learnelectrics4402]

The college way is right Lee. In for max demand based on Ib and choose cable size on this. Diversity will affect the overall demand on the whole installation. if you add all the breaker ratings together it will be a lot more than 100A, this is where diversity comes in. Hope this helps.

[@patrickburke8274]

Lovely

[@learnelectrics4402]

Thanks for the support and thanks for watching. Dave.

[@Thalasius]

Great vid! What about Fridges?

[@learnelectrics4402]

We don't apply diversity to fridges. Whatever the manufacturer's rated current is for the fridge is what we use. Hope this helps. Dave.

[@SuperGP1000]

Thanks, is it possible to provide more information about how to calculate the diversity for more than one cooker, i.e. On-Site Guide H4

[@learnelectrics4402]

Good idea, its on the list. Thanks for watching. Dave.

[@willie6559]

Thnaks Dave,great video,but there is one i don't understand,why the fluorescent lamp we multiply the actual lamp rating by 1.8 to get the total watt??where is the 1.8 come from?what is stand for ?thanks dave

[@learnelectrics4402]

The start up currents. It is an industry recognised figure for the extra current drawn when the lights are first turned on and firing an arc from one end to the other. Once the arc is there and the light is lit, it settles down to standard current. Hope this helps, thanks for watching. Dave.

[@willie6559]

@@learnelectrics4402 Very helpful, thanks

[@learnelectrics4402]

You are very welcome my friend. Dave.

[@Edgariux111]

Did that separate video ever come out ? For industrial and commercial properties? Loving these videos btw

[@learnelectrics4402]

Not yet, it is on the list. I'll see if I can shuffle it to the top, Dave.

[@Edgariux111]

@learnelectrics4402 that would be great 👍 but for now one might make a few more circuits account for a 100% usage compared to a domestic setting... just to be on a safe side :)

[@dennisfowler7873]

This sort of unrelated to the subject...if I'm doing a kitchen and I ran a 10mm cable for the HOB can I add a socket next to it for the oven...or do I need to run a separate circuit...take it of the ring...THANKS

[@learnelectrics4402]

Yes, you can spur off the cooker control panel to supply power to the oven. The building regulations allow this as long as the hob and the oven are both with 2 metres of the control panel. Hope this helps. Dave.

[@dennisfowler7873]

@@learnelectrics4402 thanks

[@learnelectrics4402]

You're welcome.

[@azizurrahman6663]

Hi dave excellent video diversity , on-site guide 1.5 mm 1mm 6A 106 metres how it calculation formula that is lighting circuit, so therefore can you do more video .thank you

[@learnelectrics4402]

Will do Azizur. It's in the notebook now. Dave.

[@onothodox]

Wouldn't you need to also divide the watts by the power factor of the cooker, to get the actual current draw?

[@learnelectrics4402]

We're following the methods in the On site guide. Thanks for watching.

[@SeanyyBoy_]

can you disregard solar installations? lets say you have a 20a circuit for a 3.68kW inverter.. this has no demand as its a generator? does solar actually offset max demand therefore reducing it? obviously this is only the case for the midday but this is when it will be assumed that load demand is at its highest.. and with battery storage does demand reduce again? hopefully i explained htat correctly. thankyou for your videos mate they are so valuable

[@learnelectrics4402]

Some solar installations will feed back into the grid, others will use battery storage. Have you read through Part 8 of the Wiring Regs on Prosumer Installations. Thanks for watching. Dave.

[@SeanyyBoy_]

@@learnelectrics4402 I haven't mate.. I'm still early in my studies so I will read this!

[@Khanjan-si8me]

I can you do one Max RCD tripping time please 1 × and 5× ?

[@learnelectrics4402]

Take a look at this video about RCDs AMENDMENT 2 - 18th EDITION - RCD TESTING, click on the link below kzbin.info/www/bejne/rIDQhZJ8iMakjM0 Thanks. Dave.

[@xlvii6994]

having trouble to understand how 66 percent was determined for lighting ??

[@learnelectrics4402]

This comes from data supplied by the IET and published in the On-Site Guide. We just use their figures and let the technical boffins work out the details. Thanks for watching, lots more to come.

[@tttrrriiipppyyy]

You're a good egg x

[@learnelectrics4402]

Thank you, appreciated.

[@mohammadtariq1541]

Page no of 311.1 is changed. It is now on page 51, in new 18th editions.

[@learnelectrics4402]

Correct. This video relates to the earlier blue book. The brown book is page 51. thanks for the input, appreciated,

[@franciscogago5961]

Ok

[@learnelectrics4402]

Lots more to come.

[@flatgash]

What happened to Emily’s husband? 😢

[@learnelectrics4402]

One of the mysteries of life. thanks for watching. Dave.

[@damooooo]

He got electrocuted.

[@mrpoo7651]

Poor Emily :(

[@learnelectrics4402]

Thank you for watching.

[@mrpoo7651]

@@learnelectrics4402 great vid as always

[@ibrahimibrahimi5384]

Learn electrics Ze measure

[@learnelectrics4402]

Yes, the video for testing and measuring Ze is on the link below. Thanks for watching. To view the video, TESTING Ze and Zs, click on the link below kzbin.info/www/bejne/m3m3kKBoorembdE

[@boblewis5558]

And therein lies the problem! Sparkies are NOT clairvoyant. ANY installation SHOULD be designed for a "Bert" or higher usage even. Otherwise when "Bert" moves house he has to forgo his hobby for weeks or even months and lay out a fortune to have his house & CU completely rewired to be suitable. STOP designing CU's for low loads! ALWAYS design for high usage, ESPECIALLY since electricity usage is increasing all the time. I'm sick and tired of seeing 6-way and 8-way extension leads having to be used in other people's houses I've visited because there are only TWO sockets in a room! Even in new builds! Bloody ridiculous! There should be AT LEAST one double socket on each wall! Anything else is BLATANTLY stupid. Likewise in bedrooms ONE double socket on ONE side of an expected bed position when there are two possible bed positions meaning FOUR DOUBLE socket outlets, one each side of each bed position and another above a standard height dressing table for hair drier etc. A house I had in Bradford had 26 individual sockets/switched power feeds in the kitchen alone on its own ring! On one occasion 22 were occupied! Not all delivering power at the same time but who wants to keep plugging and unplugging a mixer when you want a cup of tea and you can't use the microwave and toaster at the same time? Always design for "possible" not probable expected maximum load in a specific situation and with minimum diversity expected in a generic situation! Anything else is just the electrical industry lining their pockets at the expense of consumers!

[@learnelectrics4402]

Great reply Bob, thanks for watching. Dave.