Electrical Engineering Calculator Dashboard

⚡ ELECTRICAL ENGINEERING CALC Dashboard 10 Calculators

Overview

⚡

Calculators

10

🏗️

Coverage

Design & Analysis

📐

Standards

IEC / BS 7671

🔌

Phase Support

1Φ & 3Φ

Calculators

📋

Electrical Load Schedule

Total connected load, demand factor & diversity — panel sizing

Demand Load = Connected Load × Demand Factor | Diversity = Sum(Demands) / Max Simultaneous Demand

System Voltage (V) 230V (1-Phase) 415V (3-Phase) 400V (3-Phase) 220V (1-Phase)

Demand Factor (%)

Diversity Factor

Future Growth (%)

Load Description	kW	PF	Phase	Qty	kVA	Current (A)
			3Φ1Φ		—	—
			3Φ1Φ		—	—
			3Φ1Φ		—	—

Total Connected (kW)

—

Total kVA

—

Demand Load (kW)

—

After Diversity (kVA)

—

With Growth (kVA)

—

Full Load Current

—

Recommended Trafo

—

Main Breaker

—

Bus Bar (A)

—

🔒

Circuit Breaker Sizing

MCB / MCCB / ACB selection & rating

I_breaker ≥ 1.25 × I_FL (motor) | ≥ 1.0 × I_FL (others) | Round up to std size

Load Type Motor Load General Load Lighting Capacitor Bank Transformer Feeder / Busbar

Phase 3-Phase1-Phase

Load (kW)

Power Factor

Voltage (V)

Fault Level (kA)

Full Load Current

—

Design Current

—

Breaker Rating

—

Breaker Type

—

📏

Bus Bar Sizing

Copper / Aluminium bus bar cross-section

A = I / J [mm²] | J_Cu ≈ 1.6 A/mm² (enclosed) | Temp rise ≤ 35°C above ambient

Current Rating (A)

Material Copper Aluminium

Installation Enclosed (Panel) Open Air / Trunking Busduct

Ambient Temp (°C)

No. of Phases 3-Phase (3+N)1-Phase

Fault Current (kA)

Min. Area (mm²)

—

Std. Size (mm×mm)

—

Current Density

—

SC Withstand

—

🌍

Earthing & Grounding

Earth electrode resistance & conductor size

R = ρ/(2πL) × [ln(4L/d)−1] | Parallel: R_total = R_rod / N × F | GC = √(I²×t)/k

Soil Resistivity ρ (Ω·m)

Rod Length L (m)

Rod Diameter d (mm)

No. of Rods

Fault Current (A)

Fault Duration (s)

Single Rod R (Ω)

—

Combined R (Ω)

—

Status

—

GC Min. Size

—

💡

Lighting Design (Lumen Method)

Fixture count, lux level & power density

N = (E × A) / (F × UF × MF) | LPD = (N × W_lamp) / A [W/m²]

Room Length (m)

Room Width (m)

Room Height (m)

Work Plane Height (m)

Required Lux (E) 100 lux – Corridors 200 lux – Storage 300 lux – Offices 500 lux – Workshops 750 lux – Drawing Rooms 1000 lux – Labs

Lamp Lumens (per fixture)

Utilisation Factor (UF)

Maintenance Factor (MF)

Room Area

—

Room Index (k)

—

No. of Fixtures

—

Achieved Lux

—

LPD (W/m²)

—

Total Load (W)

—

Layout (rows×cols)

—

⚙️

Motor Starter Selection

DOL / Star-Delta / VFD starting current & torque

I_start_DOL = 6–8 × I_FL | Star-Delta: 1/3 × I_DOL | VFD: 1.0–1.5 × I_FL

Motor Power (kW)

Motor Voltage (V) 415V400V380V6.6kV11kV

Motor Efficiency (%)

Power Factor

Starting Method DOL Star-Delta Auto-Transformer Soft Starter VFD

AT Tap / SS Ramp (%)

Full Load Current

—

Starting Current

—

Starting Torque

—

Contactor Rating

—

🔁

Distribution Transformer Sizing

kVA rating, FLC & %loading

S_trafo ≥ Total_Demand_kVA / 0.85 | FLC = S × 1000 / (√3 × V) | Loading% = Demand / S × 100

Total Demand (kW)

Overall PF

HV Side (kV)

LV Side (V)

Max Loading (%)

%Z (Impedance)

Required kVA

—

Standard kVA

—

HV FLC (A)

—

LV FLC (A)

—

Loading %

—

Fault Current (kA)

—

HV Cable Size

—

🛡️

Relay & Protection Settings

OC relay pickup, TMS & instantaneous settings

Pickup I = CTR × I_pickup_pu | TMS: t = TMS × K / [(I/Ip)^α − 1] | Inst = 8–12 × I_FL

Protected Equipment Feeder Motor Transformer Generator

Relay Curve Standard Inverse (SI) Very Inverse (VI) Extremely Inverse (EI) Long Time Inverse

Full Load Current (A)

CT Ratio (e.g. 200/5)

Fault Current (A)

TMS (Time Mult. Setting)

Pickup Current (A)

—

Pickup (CT sec, A)

—

Trip Time at Fault

—

Inst. Setting (A)

—

📐

Power Factor Correction

Capacitor bank & APFC sizing

Qc = P(tanφ₁−tanφ₂) | C = Qc×10⁶/(2πf×V²) [μF] | Steps = Qc / Step_kVAR

Active Power (kW)

System Voltage (V)

Existing PF

Target PF

Frequency (Hz) 50 Hz60 Hz

APFC Steps

Qc Required (kVAR)

—

Cap per Phase (μF)

—

kVA Reduction

—

Step Size (kVAR)

—

🏭

Electrical Engineering All-in-One Summary

Complete system: Load → Transformer → Breaker → Cable → Earthing → PF Correction

Full electrical system snapshot from connected load to final installation recommendations

Total Load (kW)

System Voltage (V)

Power Factor

Demand Factor (%)

Soil Resistivity (Ω·m)

%Z Transformer

Target PF

Cable Length (m)

Demand Load (kW)

—

Demand kVA

—

Full Load Current

—

Transformer (kVA)

—

Main Breaker (A)

—

Cable Size (mm²)

—

Fault Current (kA)

—

Earth Rod R (Ω)

—

PF Correction (kVAR)

—

Bus Bar Size

—