Electrical Calculation

Electrical Calculation and Electrical Notes on Electrical Engineering:

All Notes ,Calculations & Abstracts are Based on Some Electrical References. All References are mention at end of each Notes.

BUY All Electrical Notes & Calculation Sheets in PDF Format (US$)

BUY All Electrical Notes & Calculation Sheets in PDF Format (Indian Rs)

Electrical Calculation :                         .

(1) CABLE:

  1. Calculation of Cable Tray Size
  2. Calculate Cable Trunking Size
  3. Calculate Conduit Size for Wire / Cables
  4. Calculate Cable Size and Voltage Drop

(2) PANEL / BUS BAR / RELAY:

  1. Calculate Size of Bus bar & Panel Design
  2. Calculate IDMT over Current Relay Setting (50/51)
  3. Calculate TC Size & Voltage Drop due to starting of Large Motor
  4. Calculate Size of Solar Panel
  5. Calculate Size of Main ELCB/ Branch MCB of Distribution Box
  6. Calculate Weight of Electrical Panel
  7. Calculate Dimension of Electrical Panel from SLD

(3) TRANSMISSION / DISTRIBUTION / TRANSFORMER:

  1. Calculate Size of Circuit Breaker/ Fuse for Transformer (As per NEC)
  2. Calculation Short Circuit Current (Base KVA Method)
  3. Calculate Technical Losses of Transmission / Distribution Line
  4. Calculate Voltage Regulation of Distribution Line
  5. Calculate Transformer Regulation & Losses (As per Transformer Name Plate)
  6. Calculate Size of Transformer & Voltage Drop due to Starting of Multiple No of Motors
  7. Calculate Short Circuit Current at Sub Panel (End user side)

(4) EARTHING / LIGHTING PROTECTION:

  1. Calculate Numbers of Plate/Pipe/Strip Earthing’s (Part-3)
  2. Calculate Numbers of Plate/Pipe/Strip Earthing’s (Part-2)
  3. Calculate Numbers of Plate/Pipe/Strip Earthing’s (Part-1)
  4. Calculate Lightening Protection for Building / Structure
  5. Calculate Size of Neutral Earthing Transformer (NET)
  6. Calculate Size of Circuit Breaker/ Fuse for Transformer (As per NEC)
  7. Calculate Earthing Strip Size for Electrical Equipment’s in Power Distribution Network
  8. Calculate Qty of Chemical Earthing Material & Size of Earthing Rod

(5) Illumination / STREET LIGHT / FLOOD LIGHT:

  1. Calculate Size of Pole Foundation & Wind Pressure on Pole
  2. Calculate Street Light Pole’s Distance / Fixture Watt / Lighting Area
  3. Calculate No of Street Light Poles
  4. Calculate No of Lighting Fixtures / Lumen for Indoor Lighting
  5. Calculate Lighting Fixture’s Beam Angle and Lumen
  6. Simple Calculation of Flood Light, Facade Light, Street Light & Signage Light-(Part-2)
  7. Simple Calculation of Flood Light, Facade Light, Street Light & Signage Light-(Part-1)
  8. Calculate Voltage drop for Street Light Poles
  9. Measurement of LUX Level and Uniformity at Indoor and Outdoor Lighting (Part-1)
  10. Measurement of LUX Level and Uniformity at Indoor and Outdoor Lighting (Part-2)
  11. Measurement of LUX Level and Uniformity at Indoor and Outdoor Lighting (Part-3)

(6) MOTOR / STARTER:

  1. Calculate Size of Cable for Motor (As NEC)
  2. Calculate Size of Contactor, Fuse, C.B, Over Load Relay of DOL Starter
  3. Calculate Size of Contactor / Fuse / CB / OL Relay of Star-Delta Starter

(7) OTHERS:

  1. Calculate Motor Pump Size
  2. Calculate Size of Capacitor Bank / Annual Saving & Payback Period
  3. Calculate Size of Diesel Generator Set
  4. Calculate Size of Inverter / Battery Bank
  5. Calculate Required Air ventilation and Heat generation of D.G Set
  6. Calculate Size of Ventilation Fan
  7. Calculate Size of Pole Foundation & Wind Pressure on Pole
  8. Calculate Size of Anchor Fastener for Water Pipe Support
  9. Calculation of Crippling (Ultimate Transverse) Load on Electrical Pole
  10. Calculate Size of Lift Pressurization Fan for Highrise Building
  11. Calculate Size of Staircase Pressurization Fan for Highrise Building
  12. Calculate Size of Water Curtain Pump / Head of Fire Pumps / Pipe Size of Suction & Delivery Header.
  13. Calculate Diesel Generator Protection Setting
  14. Calculate Main Fire Pump Capacity with Head and other Characteristic as per NBC 2016 / IS 12469 / IS 15301.
  15. Calculate Size of Anchor Fastener for Cable Tray Support.

42 Responses to Electrical Calculation

  1. TULAJAPPA's avatar TULAJAPPA says:
    April 22, 2011 at 1:49 pm

    Thanks a lot Sir, you have done a greate job. Thanks for Sharing your mind.

    Reply
  2. vijay's avatar vijay says:
    August 13, 2011 at 5:46 pm

    hello sir

    i am vijay
    there are very few people like u who share their magnificent experiences. The content you shared is very good and useful. thank you very much

    Reply
  3. L A Sharma's avatar L A Sharma says:
    July 27, 2012 at 5:28 pm

    tremendous effort and good work. you are giving a plateform to share knowledge but also helping the others with your valuable experiences

    Reply
  4. Nihar Ghosh's avatar Nihar Ghosh says:
    August 24, 2012 at 6:28 pm

    Thanks sir for shareing your knowledge…

    Reply
  5. d's avatar d says:
    April 20, 2013 at 11:37 am

    thank u sir u mail

    Reply
  6. arjun's avatar arjun says:
    September 11, 2013 at 7:12 am

    thank you sir,can i run the 10 hp motor in star connection the purpose is power savings. i am expecting your reply. thanks again.

    Reply
  7. chintan's avatar chintan says:
    September 14, 2013 at 6:39 am

    thanks

    Reply
  8. MANOJ DESHMUKH's avatar MANOJ DESHMUKH says:
    October 26, 2013 at 5:13 am

    I READ THIS WEBSITE NOTES………AWESOME………….COMMENDABLE GUIDE FOR ELECTRICAL ENGINEERS……

    Reply
  9. faizan ahmed's avatar faizan ahmed says:
    January 4, 2014 at 9:10 am

    dear sir,
    i need to purchase electrical abstract in pdf form i tried in pay pal it is not accepting kindly suggest me how i can purchase it

    Reply
  10. gopal's avatar gopal says:
    April 16, 2014 at 10:05 am

    Dear Sir,
    Kindly suggest us where we take 30mA, 100 mA in ELMCB as well about Per phase Isolation in DB

    Reply
  11. Navneet's avatar Navneet says:
    May 2, 2014 at 7:08 am

    Hi ..
    This is Navneet.
    Thanks to share these precious knowledge on the site. This is useful information for every one.

    I appreciate it ..

    Thanks…!!!

    Reply
  12. Devendra Tiwari's avatar Devendra Tiwari says:
    March 11, 2016 at 10:57 am

    hello sir,
    Could you plz confirm is there any specific clearance mention for 33 Kv underground line & over head fire hydrant water line.

    Reply
  13. Kapawar Santosh Shrihari's avatar Kapawar Santosh Shrihari says:
    July 23, 2016 at 3:37 am

    hello
    very nice information share with us thank you

    Reply
  14. Bernard's avatar Bernard says:
    November 19, 2016 at 12:15 pm

    This is the knowledge that i have really been looking for, great job Engineer

    Reply
  15. deepak pandey's avatar deepak pandey says:
    December 7, 2016 at 2:13 pm

    Thank u sir for such valuable informations

    Reply
  16. dutikrushna gouda's avatar dutikrushna gouda says:
    October 6, 2017 at 6:09 am

    Thanks a lot for better information to us.

    Reply
  17. Hitendrasinh's avatar Hitendrasinh says:
    October 13, 2019 at 2:19 am

    Thank u so much sir for such valuable informations

    Reply
  18. Vijay Mohale's avatar Vijay Mohale says:
    May 2, 2020 at 4:45 am

    Dear Sir
    I need your email ID.Could you please provide and email id too.

    Reply
  19. Mohamed Thariq Hussain's avatar Mohamed Thariq Hussain says:
    June 9, 2020 at 8:09 am

    Great work! Appreciate. I have collected many valuable information from your blogs. Thank you.

    Reply
  20. janaka's avatar janaka says:
    July 11, 2020 at 8:21 pm

    found so many errors in the calculations that create inconsistency. However the theory and formulas are ok

    Reply
  21. Baswaraj Devure's avatar Baswaraj Devure says:
    July 19, 2020 at 9:11 am

    how to select rotor controller bypass contactor

    Reply
  22. Vikrant Singh's avatar Vikrant Singh says:
    July 29, 2020 at 11:49 am

    Sir
    Thanks to you for sharing all above information with us.
    I have doubt in the formula of earthing part 1

    The Earth Resistance of Single Rod or Pipe electrode is calculated as per BS 7430:
    R=ρ/2×3.14xL (loge (8xL/d)-1)
    Where ρ=Resistivity of Soil (Ω Meter),
    L=Length of Electrode (Meter),
    D=Diameter of Electrode (Meter)
    Example:
    Calculate Isolated Earthing Rod Resistance. The Earthing Rod is 4 Meter Long and having 12.2mm Diameter, Soil Resistivity 500 Ω Meter.

    As per formula I din’t get the value which you have solved.
    R=500/ (2×3.14×4) x (Loge (8×4/0.0125)-1) =156.19 Ω.

    Please clarify this.

    Thanks

    Reply
  23. Jay Dhokai's avatar Jay Dhokai says:
    August 7, 2020 at 4:31 am

    Good Effort.
    Thanks for this Valuable Knowledge.

    Reply
  24. santosh wagh's avatar santosh wagh says:
    August 23, 2020 at 8:19 am

    Dear Sir,

    Please tell me about crane application resistance box calculation

    Reply
  25. Amarnath's avatar Amarnath says:
    August 28, 2020 at 5:54 am

    How to we buy from book shop

    Reply
  26. Haydar Alghalibi's avatar Haydar Alghalibi says:
    October 14, 2020 at 10:55 am

    Hi,
    Did the Excel base Programs (Electrical Engineering) sporting Australian standards or i can use it with any standards? this is my only concern before purchasing this product.
    Best Regards,

    Reply
  27. Mr.Prodip's avatar Mr.Prodip says:
    November 3, 2020 at 10:08 am

    Thanks, sir for sharing your knowledge, your post has a lot of information. Your post that I have a lot to learn..https://plcinverterhmi.com/

    Reply
  28. Swatantra's avatar Swatantra says:
    November 24, 2020 at 7:55 am

    Thanks sir for your convenience of sharing your knowledge with us.

    Dear sir,
    I want to know about the HT motors o/l , e/f, U/V, settings at HT Breaker (VCB).

    Reply
  29. Mustafakhan's avatar Mustafakhan says:
    December 18, 2020 at 12:22 pm

    REVU BLUE BEAM, *LEARN*

    Reply
  30. j sunder selvin's avatar j sunder selvin says:
    January 30, 2021 at 3:55 am

    which cable will carry more current underground or oh cables?

    Reply
  31. Maria's avatar Maria says:
    May 26, 2021 at 12:43 pm

    Thanks for sharing these amazing calculation. I really appreciate your time!!

    Reply
  32. DEEPARPAN ENGINEERING SOLUTIONS's avatar DEEPARPAN ENGINEERING SOLUTIONS says:
    June 1, 2021 at 7:30 am

    Hi Sir,

    I am Deepak Pomendkar from Mumbai,

    Our client is having 1250 kVA & 1600 Kva Delta star Transformers in there premisses,

    They want to upgrade their grounding system for above said tranformer.

    Please guide us for better earthing strip sizing as per IEEE

    OR suggest formulla of grounding.

    Thank you

    Reply
  33. Alan Ford's avatar Alan Ford says:
    February 24, 2022 at 10:42 am

    Very comprehensive information, but in truth way above my pay grade.
    I’m looking for a consultant to help me in a business startup.
    If you can assist please contact me.
    Kind Regards
    Alan

    Reply
  34. Janardhan Namde's avatar Janardhan Namde says:
    April 2, 2022 at 8:18 am

    Dear Sir,
    I am Janardhan. And always read your valuable Technical information on Electrical Engineering. The Notes are so Extensive and very good Knowledge sharing method

    Reply
  35. Laxmi Kanta Hazra,'s avatar Laxmi Kanta Hazra, says:
    August 21, 2022 at 9:53 am

    Hi sir, I am Laxmikanta. Just one day before I know about this use full site from my friend. I want to know about sub-merged arc furnace transformer which is use in ferro alloys sector. Please share about its working system in details.

    Reply
  36. K.Sivasankaram's avatar K.Sivasankaram says:
    January 10, 2023 at 5:03 pm

    Great effort and greater help to many engineering personnel in the field. It may be worth combining all the articles and publish as a pocket book for practing elec Engrs

    Reply
  37. Dilip singh's avatar Dilip singh says:
    March 13, 2023 at 6:04 pm

    Dear Sir,
    we are making 750V AC Electrical panel first time for Railway project mumbai.
    we need technical information distance between copper busbar to busbar.
    All switchgear are L & T make ACBs & MCCBs.
    1) Distance between Phase to Phase Busbar in mm.
    2) Distance Between Phase To Neutral Busbar In mm.
    3) Distance Between Phase To Earth Busbar in mm.

    Reply
  38. soumya k's avatar soumya k says:
    July 1, 2023 at 7:26 am

    Thank you so much sir. Your blogs really inspire me to reach my goal, the content elaborates how passionate you are with you career.

    Reply
  39. Shivakumar Hiremath's avatar Shivakumar Hiremath says:
    July 9, 2023 at 10:48 am

    Good Job by sharing Knowledge Sir

    Reply
  40. mahmoud's avatar mahmoud says:
    June 27, 2024 at 10:35 am

    please can you send me an Excel calculation sheet for volt drop and cable size as sample ,then i will buy all your Excel sheets

    Reply
  41. naitik patel's avatar naitik patel says:
    September 11, 2024 at 7:16 am

    Where to Earth fault loop impedance test performed? Which type of test performed and criteria and report after measurement of loop impedance test?

    Reply

Leave a Reply