# 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:**

- Calculation of Cable Tray Size
- Calculate Cable Trunking Size
- Calculate Conduit Size for Wire / Cables
- Calculate Cable Size and Voltage Drop

**(2) Panel / Bus bar / Relay:**

- Calculate Size of Bus bar & Panel Design
- Calculate IDMT over Current Relay Setting (50/51)
- Calculate TC Size & Voltage Drop due to starting of Large Motor
- Calculate Size of Solar Panel
- Calculate Size of Main ELCB/ Branch MCB of Distribution Box

**(3) Transmission / Distribution / Transformer:**

- culate Size of Circuit Breaker/ Fuse for Transformer (As per NEC)
- Calculation Short Circuit Current (Base KVA Method)
- Calculate Technical Losses of Transmission / Distribution Line
- Calculate Voltage Regulation of Distribution Line
- Calculate Transformer Regulation & Losses (As per Transformer Name Plate)

**(4) Earthing / Lighting Protection:**

- Calculate Numbers of Plate/Pipe/Strip Earthings (Part-3)
- Calculate Numbers of Plate/Pipe/Strip Earthings (Part-2)
- Calculate Numbers of Plate/Pipe/Strip Earthings (Part-1)
- Calculate Lightening Protection for Building / Structure
- Calculate Size of Neutral Earthing Transformer (NET)
- Calculate Size of Circuit Breaker/ Fuse for Transformer (As per NEC)

**(5) Illumination / Street Light / Flood Light:**

- Calculate Size of Pole Foundation & Wind Pressure on Pole
- Calculate Street Light Pole’s Distance / Fixture Watt / Lighting Area
- Calculate No of Street Light Poles
- Calculate No of Lighting Fixtures / Lumen for Indoor Lighting
- Calculate Lighting Fixture’s Beam Angle and Lumen
- Simple Calculation of Flood Light, Facade Light, Street Light & Signage Light-(Part-2)
- Simple Calculation of Flood Light, Facade Light, Street Light & Signage Light-(Part-1)
- Calculate Voltage drop for Street Light Poles

**(6) Motor:.**

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

**(7) Others:.**

- Calculate Motor Pump Size
- Calculate Size of Capacitor Bank / Annual Saving & Payback Period
- Calculate Size of Diesel Generator Set
- Calculate Size of Inverter / Battery Bank
- Calculate Required Air ventilation and Heat generation of D.G Set
- Calculate Size of Ventilation Fan
- Calculate Size of Pole Foundation & Wind Pressure on Pole
- Calculate Size of Anchor Fastener for Water Pipe Support
- Calculation of Crippling (Ultimate Transverse) Load on Electrical Pole

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

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Sir

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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

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