⚙ CircuitSecrets
Electrical Engineering Dashboard
Complete engineering suite for load schedules, breaker sizing, busbars, earthing, transformers, and power factor correction.
Calculator 01
Electrical Load Schedule
Demand Load = Connected Load × Demand Factor | Diversity = Sum(Demands) / Max Demand
| Load Description | kW | PF | Phase | Qty | kVA | Current (A) |
|---|---|---|---|---|---|---|
| — | — | |||||
| — | — | |||||
| — | — |
Calculation Results
Total Connected (kW)
—
Total kVA
—
Demand Load (kW)
—
After Diversity (kVA)
—
With Growth (kVA)
—
Full Load Current
—
Recommended Trafo
—
Main Breaker
—
Bus Bar (A)
—
Calculator 02
Circuit Breaker Sizing
I_breaker ≥ 1.25 × I_FL (motor) | ≥ 1.0 × I_FL (others) | Round up to std size
Calculation Results
Full Load Current
—
Design Current
—
Breaker Rating
—
Breaker Type
—
Calculator 03
Bus Bar Sizing
A = I / J [mm²] | J_Cu ≈ 1.6 A/mm² (enclosed) | Temp rise ≤ 35°C above ambient
Calculation Results
Min. Area (mm²)
—
Std. Size (mm×mm)
—
Current Density
—
SC Withstand
—
Calculator 04
Earthing & Grounding
R = ρ/(2πL) × [ln(4L/d)−1] | Parallel: R_total = R_rod / N × F | GC = √(I²×t)/k
Calculation Results
Single Rod R (Ω)
—
Combined R (Ω)
—
Status
—
GC Min. Size
—
Calculator 05
Lighting Design (Lumen Method)
N = (E × A) / (F × UF × MF) | LPD = (N × W_lamp) / A [W/m²]
Calculation Results
Room Area
—
Room Index (k)
—
No. of Fixtures
—
Achieved Lux
—
LPD (W/m²)
—
Total Load (W)
—
Layout (rows×cols)
—
Calculator 06
Motor Starter Selection
I_start_DOL = 6–8 × I_FL | Star-Delta: 1/3 × I_DOL | VFD: 1.0–1.5 × I_FL
Calculation Results
Full Load Current
—
Starting Current
—
Starting Torque
—
Contactor Rating
—
Calculator 07
Distribution Transformer Sizing
S_trafo ≥ Total_Demand_kVA / 0.85 | FLC = S × 1000 / (√3 × V) | Loading% = Demand / S × 100
Calculation Results
Required kVA
—
Standard kVA
—
HV FLC (A)
—
LV FLC (A)
—
Loading %
—
Fault Current (kA)
—
HV Cable Size
—
Calculator 08
Relay & Protection Settings
Pickup I = CTR × I_pickup_pu | TMS: t = TMS × K / [(I/Ip)^α − 1] | Inst = 8–12 × I_FL
Calculation Results
Pickup Current (A)
—
Pickup (CT sec, A)
—
Trip Time at Fault
—
Inst. Setting (A)
—
Calculator 09
Power Factor Correction
Qc = P(tanφ1−tanφ2) | C = Qc×10&sup6;/(2πf×V²) [μF] | Steps = Qc / Step_kVAR
Calculation Results
Qc Required (kVAR)
—
Cap per Phase (μF)
—
kVA Reduction
—
Step Size (kVAR)
—
Calculator 10
Electrical Engineering All-in-One Summary
Full electrical system snapshot from connected load to final installation recommendations
Calculation Results
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
—
Calculator 11
Cable Sizing & Voltage Drop
A = (I × L × ρ) / (e × V) [mm²] | VD = (m × ρ × L × I) / A
Calculation Results
Load Current
—
Size by Current
—
Size by VDrop
—
Final Cable Size
—
Actual VDrop
—
Data Management
Saved Setups (Update / Edit)
Click "Save Setup" inside any calculator to store its values. Click "Update" below to automatically scroll to that calculator and load the values back.
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