Electrical Load Schedule Designer

Build a building or panel load schedule. Enter the connected load in each category and its demand factor — the app totals the connected & demand load (VA, kW), finds the demand current at your voltage/phase, and sizes the main breaker and a typical feeder conductor (THHN copper, 75 °C) per the Philippine Electrical Code.

⭐ Free to use · Balance … EP

① Supply system

System voltage (V)

Line-to-line for 3-φ (e.g. 230, 400), or service voltage for 1-φ.

Phase

Overall power factor

Used to convert demand VA → kW. Default 0.90.

② Connected load by category

Enter the connected load (VA) and a demand factor (%) for each category. Leave a row at 0 if unused. 1 W ≈ 1 VA at unity PF; if you only know watts, divide by the PF.

③ Service-sizing options

Add 125% of the largest-motor load (PEC motor-feeder rule) Treat the whole load as continuous (size the main at 125%)

The main breaker is rounded UP to the next standard rating; the feeder conductor is the smallest typical THHN-copper (75 °C) size whose ampacity is at least the breaker rating.

⚡ Load schedule & service sizing

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Demand load · main breaker · feeder conductor

Load totals

Connected load

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Connected (kVA)

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Demand load

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Demand (kVA)

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Demand (kW)

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Demand current

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Service sizing

Sizing current

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Main breaker (OCPD)

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Feeder conductor

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Worked solution

⚠️ Verify against the PEC. Demand factors, conductor ampacities and standard breaker ratings here are typical Philippine Electrical Code (PEC) figures for THHN copper at 75 °C in a normal ambient. Real designs must apply the exact PEC demand-factor tables, ampacity-correction/adjustment factors, conduit fill, and voltage-drop checks for your conductor, insulation and installation. This tool is a study/estimating aid.