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.

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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

(3) Transmission / Distribution / Transformer:

  1. culate 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)

(4) Earthing / Lighting Protection:

  1. Calculate Numbers of Plate/Pipe/Strip Earthings (Part-3)
  2. Calculate Numbers of Plate/Pipe/Strip Earthings (Part-2)
  3. Calculate Numbers of Plate/Pipe/Strip Earthings (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)

(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

(6) Motor:.

  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

30 Responses to Electrical Calculation

  1. TULAJAPPA says:

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

  2. vijay says:

    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

  3. L A Sharma says:

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

  4. Nihar Ghosh says:

    Thanks sir for shareing your knowledge…

  5. d says:

    thank u sir u mail

  6. arjun says:

    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.

  7. chintan says:




  9. faizan ahmed says:

    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

  10. gopal says:

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

  11. Navneet says:

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

    I appreciate it ..


  12. Devendra Tiwari says:

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

  13. hello
    very nice information share with us thank you

  14. Bernard says:

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

  15. deepak pandey says:

    Thank u sir for such valuable informations

  16. dutikrushna gouda says:

    Thanks a lot for better information to us.

  17. Hitendrasinh says:

    Thank u so much sir for such valuable informations

  18. Vijay Mohale says:

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

  19. Mohamed Thariq Hussain says:

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

  20. janaka says:

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

  21. Baswaraj Devure says:

    how to select rotor controller bypass contactor

  22. Vikrant Singh says:

    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)
    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.


  23. Jay Dhokai says:

    Good Effort.
    Thanks for this Valuable Knowledge.

  24. santosh wagh says:

    Dear Sir,

    Please tell me about crane application resistance box calculation

  25. Amarnath says:

    How to we buy from book shop

  26. 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,

  27. Mr.Prodip says:

    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/

  28. Swatantra says:

    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).

  29. Mustafakhan says:


  30. j sunder selvin says:

    which cable will carry more current underground or oh cables?

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