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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)

Room Outlets Notes
Kitchen/Utility  6 Where homes have separate areas, the kitchen should have a minimum of four outlets and the utility room two.
Utility  3 Where appliances are provided, at least three outlets should be for general use.
Dining room  3
Living room  4 At 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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author-pic

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.

46 Comments


  1. 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.


  2. Ezekiel esin
    Jun 23, 2019

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


  3. 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.


  4. Abdulmajeed
    May 09, 2019

    Thank you very much… This really helps


  5. 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


  6. kailash khanduri
    Dec 27, 2018

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


  7. 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.


  8. idris abubakar
    Dec 18, 2018

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


  9. Mbey Ejuka
    Dec 16, 2018

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


  10. michael olorunyemi
    Nov 14, 2018

    Good one, i love the concept. thanks


  11. 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


  12. 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


  13. 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.


  14. 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


  15. Farhan Zaid
    Jul 08, 2016

    Thank you brother.


  16. sameera
    Jun 11, 2016

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


  17. Muhammad Awais Qureshi
    Sep 21, 2015

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


  18. IQBAL HUSSAIN
    Aug 17, 2015

    waiting for your next article
    electrical engineer
    iqbal


  19. 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?


  20. 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…


  21. 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.


  22. 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.


  23. 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


  24. ARSHAD AYUB RAZA TAUSEEFI
    Apr 21, 2015

    nice i got sufficient information


  25. fredrick kanakulya
    Mar 25, 2015

    Two bedroom house with toilet small kitchen . Electrical drawing


  26. KD
    Mar 25, 2015

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


  27. Amos Oduory
    Feb 27, 2015

    Its great and empowering, i like reading it regularly


  28. Sunday Ojofu
    Sep 07, 2014

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


  29. waheed yusuf
    Apr 22, 2014

    At least I have learn one or things about electrical.


  30. waheed yusuf
    Apr 22, 2014

    I love to learn more from you .


  31. 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.


  32. 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


  33. 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 nwabukochukwuemeka@yahoo.com


  34. muqtar
    Mar 21, 2014

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


  35. Amit Anand
    Mar 21, 2014

    I want to read this regularly..


  36. Amit Anand
    Mar 21, 2014

    I excited to read this..

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