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Home / Technical Articles / Electrical Design Project of a Three Bed Room House (1)

Requirements and Standards

Electrical design is not an easy task. It requires a lot of expertise. Detailed study is needed prior to installation work. The engineer must consider quality and any specific requirements together with price. Different options are to be examined.

Electrical design project of a three bed room house (Part 1)
Electrical design project of a three bed room house (Part 1)

Choice of room utilization, decor, hobbies and the activities of the various residents are now critical to electrical design.

Electrical installation cannot make universal provision for every conceivable arrangement.

Customer is the key person in determining the final arrangement. BS 7671 (the Wiring Regulations) will often recommends that a project should be discussed with the client.

Flexible design approach is now often practiced. Standards for the house industry are determined by the National House Building Council (NHBC).


The minimum requirements

The following is an outline of basic requirements for a three-bedroom house with 120m2 floor area. This would be a typical speculative estate development (Figure 2).

  1. Rooms: small kitchen; dining room; lounge; downstairs cloakroom; main bedroom with en-suite bathroom; second double bedroom; small single bedroom; landing bathroom or shower room;
  2. Heating: central heating by gas or oil;
  3. Garden: small garden at both front and rear.
Bathroom zones
Figure 1 – Bathroom zones

Standards

National House Building Council (NHBC)

The NHBC give minimum standards for living accommodation and services, which are shown in Table 1. It should be noted that houses vary in size and use, so the values given should be considered as a minimum.

Table 1 – NHBC recommendations for a house.

13 A socket-outlets (twin socket count as two outlets)

RoomOutletsNotes
Kitchen/Utility 6Where homes have separate areas, the kitchen should have a minimum of four outlets and the utility room two.
Utility 3Where appliances are provided, at least three outlets should be for general use.
Dining room 3
Living room 4At one double outlet family room should be near the TV aerial outlet
Bedroom 3 (2)Three for main bedroom. Two for other bedrooms
Landing 1
Hall 1
Combined rooms should have sockets equal to the sum of the number for individual rooms, with a minimum of seven in the case of kitchen / utility and another room.
Lighting
Every room should have at least one lighting point. Two-way switching should be provided to staircases.
Smoke detectors
For this two-story house, two mains operated, interconnected alarms are required.

Relevant wiring regulations 13 A socket-outlets

  1. Building Regulations now require socket-outlets, wall switches and other similar accessories to be sited in habitable rooms at appropriate heights of between 450 and 1200mm from the finished floor levels.
  2. Any socket-outlet with a rated current not exceeding 20 A, which is used by ordinary persons’ equipment for outdoors use must be provided with additional protection by means of a 30mA RCD.
  3. No 230V sockets, except shaver sockets complying with BS EN 61558-2 are permissible in bathrooms and shower rooms.
  4. 230V socket-outlets must be located at least 3m outside the boundary of zone 1 and provided with 30mA RCD protection.

Lighting

  1. To avoid danger and inconvenience, there should be more than one lighting circuit.
  2. In a bathroom, all equipment must be suitable for the zone in which it is installed.
  3. Wall switches and other accessories must not be installed in zones 0, 1 and 2.
  4. Cord switches must be installed outside of zones 0, 1 and 2, but the cord may hang within zones 1 and 2.
  5. There are restrictions on the current-using equipment in zones 0, 1 and 2.
  6. Equipment that is installed in zones 1 and 2 must have water penetration protection of at least IPX4.
  7. A careful study of BS 7671: (Most recent version) Section 701 is recommended.
Figure 2 - Typical three bedroom house
Figure 2 – Typical three bedroom house

Will be continued soon…

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Sufi Shah Hamid Jalali

B.Sc. in Electrical Engineering. Designer of websites. Currently working as Electrical Engineer at Aga Khan Foundation, Afghanistan. Likes to write and share knowledge of Electrical Engineering. Knows Primavera P6, Graphics, Professional AutoCAD and Project Management.

76 Comments


  1. R.B
    May 06, 2023

    your work is too good


  2. Emmanuel Pataki Richard
    Dec 27, 2022

    I am so glad to submit my request before you on your most greatest attention to me.


  3. Emmanuel Pataki Richard
    Dec 27, 2022

    I’m quietly so interested in this project,I would need you to help me more and more.hope you are there seeing and thinking more about what am need of.thanks.


  4. Engineer Henry Kondo
    Dec 03, 2022

    I am a graduate and a professional electrical engineer who have completed my Higher National Diploma in Electrical Engineering and am looking for a job .I have a good practical knowledge and I am good in Autocard design too.counting on your usual cooperation.Thank you


  5. Jonathan
    Aug 08, 2022

    What are the most important things to not before starting electrical installation in a building?


  6. Jonathan
    Aug 08, 2022

    I like your work done


  7. Ar.Ambalavanan
    Jun 25, 2022

    duplex villa type house electrical layout plan


  8. Chinonso nnedum
    Jun 16, 2022

    I’m an electrician and I’m looking for job


  9. Emmanuel abbey
    Dec 31, 2021

    am eletrication and im looking for more job


  10. Daryle S CESARIO
    Dec 20, 2021

    What is the electrical and Quality office


    • Emmanuel abbey
      Dec 31, 2021

      the basic electrical voltage


  11. Salami oladele
    Sep 15, 2021

    I like your information.it gives me more updates about electrical.i like to know how to calculate load and installation height .thanks


  12. Felix fiebor
    Aug 23, 2021

    What is the easiest and practical way to estimate quantity of lighting and socket cables for a normal bedroom


  13. Ubon Ukpong
    Jun 09, 2021

    Please, I really want to know the size of cable one can use to earth a building of 3 bedroom flat?


    • Ekwueme chibueze
      Dec 06, 2021

      I want to learn how wire a building ,most especially earthing a building


  14. Prosper piere
    Nov 24, 2020

    Please sir, can you help me load ratings of 3 bedroom flat and the cable sizes to be use, thank you.


  15. kc-ann bagtang
    Sep 28, 2020

    TITLE: ELECTRICAL DESIGN OF THREE BEDROOM RESIDENTIAL HOUSE

    you are going to design an electrical layout of 3 bedrooms residential house with the following contents:
    1. INTRODUCTION – discuss all about your design.
    2. DEFINITION OF TERMS – discuss the terms you use in your design ex. circuit define it.
    3. LIGHTING LAYOUT
    4. POWER LAYOUT
    5. SCHEDULE OF LOADS
    6. LEGENDS/SYMBOLS
    7. SPECIFICATIONS
    8. RISER DIAGRAM
    9. VICINITY MAP/LOCATION OF YOUR PROJECT
    10. COMPUTATION – computation on how you got the values you put in the schedule of
    loads

    can some one give an answer for this?????THANKYOU SO MUCH!


    • Virginia Gonzalez
      Nov 24, 2020

      Good afternoon,

      There is a guide for the calculation of electrical installations for premises (supermarkets)


      • fe ner
        May 27, 2021

        Please, could you send me a format on how to calculate the load of a three-bedroom flat?


  16. Ekemini I
    Jun 24, 2020

    I won’t to be able run the writing


  17. Uchenna Ndukuba
    Jun 08, 2020

    Pls can u send me a format on how to calculate load of three bed room


    • bony dutta
      Jun 26, 2020

      there is a method that you can do it easily if you want to learn it just email me:[email protected],i m a electrical designer, i can explain you properly


      • Bello A Emmanuel
        Jul 23, 2020

        Hello can u send me d diagram of how to install bed switch and socket in room and sitting room. Thanks for ur concern.


      • Elisius
        Oct 04, 2020

        Please, could you send me a format on how to calculate load of a three bedroom flat.


      • Paul oguguo
        Feb 18, 2021

        Pls sir I need more explanation


    • Daryle S CESARIO
      Dec 20, 2021

      What is electrical and Quality office


  18. Mohammad Ehsan Ullah
    Jan 16, 2020

    I am teacher and I hope that learn more thing from you.


  19. Yogesh Khetani
    Nov 25, 2019

    Couldn’t understand a thing here.


  20. JEFF
    Aug 01, 2019

    well explained but i would want to know the height of sockets installled in normal rooms and those ones in pantry, kitchen and utility rooms.where do we install weatherproof sockets and why.


  21. Ezekiel esin
    Jun 23, 2019

    I want to acquire more skills also know the machine that is use for load balancing


  22. lucasamelia
    Jun 21, 2019

    Really helpful post about electric design for a three bedroom house, Electricity is also a basic need of every person so there should be facilities of electricity. Keep giving updates.


  23. Abdulmajeed
    May 09, 2019

    Thank you very much… This really helps


  24. Elijah
    Jan 17, 2019

    Like your post. Pls kind I have electrical diagrams and materials for a 5-Bedroom duplex; GF- large living room/dinning, kitchen, 2 rooms and foyer. FF: 3 rooms, 2 study room, small private living room and balcony. Thanks.


    • Vidhu Krishnan
      Jan 19, 2019

      We deal in all Electrical and AC works as per the customer needs.We have a good team to work at 24×7 maintenance of Electrical,plumbing and AC installation.We have completed more than 200 plus villas and commercial units from the last one year.Let us meet and discuss the details.contact or msg 66337791


  25. kailash khanduri
    Dec 27, 2018

    how many twin control light point in a 3 BHK residential flat ?


  26. Giuseppe DAngelo
    Dec 26, 2018

    the way it was presented is clear and concise, no mention on fire protection for us in california legislation in 2011 adopted CO detectors and combo alarms to have 7 year life if date code is 2011 or earlier need to be replaced, End of life signal alarm chirps 5 times or green LED flashes five times a minute.


  27. idris abubakar
    Dec 18, 2018

    what is good one I really lean a lot thank you and more of the electrical plan


  28. Mbey Ejuka
    Dec 16, 2018

    Very practical. Thank you! I need a regular update on materials like this


  29. michael olorunyemi
    Nov 14, 2018

    Good one, i love the concept. thanks


  30. Brister
    Apr 10, 2018

    Good day Sir

    Can you please send me the calculations for the entire house-load,circuit breaker ratings and cable sizing.

    Thanks in advance


    • Ogunleye lekan
      Mar 21, 2021

      Good one, please how many sucket should be in kechine


  31. Yaw Adomako
    Apr 08, 2018

    wow is very good but can you send some of your electrical plan ,like 5 rooms wiring plan for me,please


  32. Yusif Saeed Yusif
    Feb 20, 2018

    Tnx for the post,,, but if you could help me please,,I’m an electrician but I find difficulty in calculating the number of materials like 22mm pvc pipes,,,conduit cables etc. For 2,3,4 bedroom houses.. I plead with u to teach me with some examples & samples,, God bless you.


  33. Palanikalvarayan
    Sep 30, 2016

    Hai3 bedroom and livings rooms and3 bathroom and kitchen rooms .total 25 flotation wiring size formula what material list send my mail palanivdm@ Gmail.com for use Oman country .please I am waiting for your reply thanking you


  34. Farhan Zaid
    Jul 08, 2016

    Thank you brother.


  35. sameera
    Jun 11, 2016

    please send me useful articles like this relating to electrical designing.
    can you please explain the lighting design software Dialux.


  36. Muhammad Awais Qureshi
    Sep 21, 2015

    Please send me electrical software for made diagram of electrical wiring.
    Thanks


  37. IQBAL HUSSAIN
    Aug 17, 2015

    waiting for your next article
    electrical engineer
    iqbal


  38. isiaka ibrahim
    Jun 26, 2015

    am an undergraduate student of bayero universty kano, level 500. pls i need a well completed project on electrical service design. because i want to wright my final year project on it. thanks


    • muktari musa
      Jun 29, 2017

      pls can i get some materials from you?


  39. SIVARAJA.T.S
    Jun 26, 2015

    I’m a degree holder B Eng. (Hons) in Electrical Engineering (power) From UTM 2010 (University Technology Malaysia. I would like to continue for my master degree in electrical field on line how shall I go about it?
    Need some advice…. Thank you…


  40. yetunde
    Jun 05, 2015

    pls i want know if there are software apart from autocad that be use for electrical building designs that has installed legends and can also calculate the numbers of fluorescent lamps, number of sockets etc for a particular room with given length and width.
    thanks


    • Sufi
      Jun 06, 2015

      For lighting use DIALux.


  41. yetunde
    May 12, 2015

    i need to get th latest software for the design of residential buildings in electrical. also i want to know how to calculate the numbers of fluorescent lamp for a particular room if given the length and width.


  42. md abrar mohiuddin siddiqi
    May 06, 2015

    i have a duplex house in which 8 bedroom are there. but i am confused how many electric board required in each bedroom. one electric board on the entrance and second board beside the bed. But tv come on another wall, so for tv also required electric board


  43. ARSHAD AYUB RAZA TAUSEEFI
    Apr 21, 2015

    nice i got sufficient information


  44. fredrick kanakulya
    Mar 25, 2015

    Two bedroom house with toilet small kitchen . Electrical drawing


  45. KD
    Mar 25, 2015

    I am very happy and love to read this article. I am waiting for your next article too.


  46. Amos Oduory
    Feb 27, 2015

    Its great and empowering, i like reading it regularly


  47. Sunday Ojofu
    Sep 07, 2014

    Please don’`t stop, I am seriously waiting for your next article. I love this.


  48. waheed yusuf
    Apr 22, 2014

    At least I have learn one or things about electrical.


  49. waheed yusuf
    Apr 22, 2014

    I love to learn more from you .


  50. nmr
    Apr 01, 2014

    PL ALSO PROVIDE A MAIN SWITH,MCBS ETC WITH RATINGS AND ACTUAL WIRING DIAGRAM OF PHASE,NEUTRAL AND EARTH WIRES FOR THE ABOVE 3 BED ROOM/HALL LONGUE ETC., THE WIRES RATING ALSO TO BE GIVEN// URGENT PLEASE


    • Sufi Shah Hamid Jalali
      Apr 07, 2014

      Dear Nmr. If you have any specific question in technical terms please email it to me directly so I can answer you in that case.


  51. nmr
    Apr 01, 2014

    SIRS, IN INDIA WE ARE USING 5 A OR 15 A SOCKETS OR MULTIPLE SOCKETS TO USE 5 A APPRATUS AND 15 A APPARATUS IN THE SAME SOCKET// THE ABOVE INDICATES 13 A OUTLETS// FIRST OF ALL PL TELL ME OUTLET MEANS WHAT//
    AND 5 A SOCKETS ALSO WE ARE USING MULTIPLE TYPE //TO SUIT TWO PIN LOADS AND TO USE 3 PIN LOADS// AS SUCH PL CLRIFY THE SAME.
    THX


    • Ken
      Dec 18, 2015

      Outlet means the point from which your load/apparatus is connected to power. In this article Outlet=Socket


  52. Sufi Shah Hamid Jalali
    Mar 23, 2014

    Don’t worry guys, I will continue to continue this topic and to post new ones through EEP. Thanks to Edvard as well for his assistance in publishing my articles.


    • ahmad al-qawasmeh
      Mar 30, 2014

      Thanx


    • FERDINAND CHIDUBEM
      Jun 13, 2017

      thanks to you alot for the teaching please am always inquisitive of things about electrical connection but will you help me to be doing it practically at anywhere i am and can even make me your worker after some training


    • Nwabuko Alfred
      Dec 24, 2018

      Thanks for this your article, was really beneficial to me. But i will also love to get some details about the overall calculations.. My email address is [email protected]


  53. muqtar
    Mar 21, 2014

    wow its great, and please post some good small projects like this regularly.


  54. Amit Anand
    Mar 21, 2014

    I want to read this regularly..


  55. Amit Anand
    Mar 21, 2014

    I excited to read this..

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