Electrical sizing workspace

Cables, Transformer & Generator Sizing

Follows the Gulf Cable PDF terms and uses its current-rating and voltage-drop tables as the cable selection reference.

Load schedule

Load description	Input	Value	Qty	Supply	PF	Demand	Continuous
						%
						%
						%

Single-phase loads are treated as evenly distributed across the three phases. “Continuous” applies a 125% design factor.

Design parameters

System voltage

Cable route length

Maximum voltage drop

InsulationConductorCable arrangementInstallationArmour conditionReference conductor temperatureNeutral conductorAdditional correction factor

Transformer target loading

Generator target loading

Generator motor allowance

PDF reference basis

Cu / XLPE / 3 & 4 core

Current rating and voltage drop from the PDF current-rating table for 3 & 4 core copper XLPE insulated armoured/unarmoured cables.

Install termsIn Air / In Ground / In Duct

Single-core basis3 phases + neutral per set

Correction factor1.00 user-applied

PDF base condition20°C ground

Catalog factor row15°C: 1.04 · 20°C: 1 · 25°C: 0.96 · 30°C: 0.93 · 35°C: 0.89 · 40°C: 0.85 · 45°C: 0.8 · 50°C: 0.76

Live recommendation

Equipment sizes

Demand load417.0 kW

Demand apparent power463.3 kVA

Operating current645 A

Design current783 A

01 Main breaker

800 A

ACB, adjustable protection recommended

Design current783 A

02 Transformer

630 kVA

Selected at 80% target loading

Calculated minimum579.2 kVA

03 Standby generator

750 kVA

Selected at 80% target loading with 20% motor-starting allowance

Calculated minimum695.0 kVA

04 Main cable

2 × 3 & 4 core × 185 mm²

Cu / XLPE / 3 & 4 core, in ground, armoured reference

Reference current rating445 A

Corrected ampacity890 A

Voltage drop constant0.26 V/A/km

Voltage drop8.1 V · 1.96%

Resistance / reactance0.1280 / 0.072 Ω/km

Physical cable pieces2

Calculation basis

3-phase current: I = kVA × 1000 ÷ (√3 × V)

Breaker: next standard rating above design current

Transformer: demand kVA ÷ target loading

Generator: demand kVA × motor allowance ÷ generator target loading

Cable: select the first catalog size whose corrected ampacity exceeds breaker rating and whose catalog voltage-drop constant stays within the limit

Catalog assumptions come from the supplied Gulf Cable PDF tables. Confirm short-circuit duty, protection coordination, earthing, neutral sizing, harmonics, and local code compliance before issue for construction.

Project snapshot2 × 3 & 4 core × 185 mm²

Main feeder recommendation based on demand load, voltage-drop limit, and the selected Gulf Cable family.

Demand load417.0kW

Design current783A

Main breaker800A

Cable pieces2pcs

Load Schedule

#	Load description	Input	Value	Qty	Supply	PF	Demand	Continuous	Demand kVA	Design kVA
1	Load 1	kW	325.0	1	3-phase	0.90	100%	Yes	361.1	451.4
2	Load 2	kW	5.0	8	1-phase	0.90	80%	Yes	35.6	44.4
3	Load 3	kW	60.0	1	3-phase	0.90	100%	No	66.7	66.7

Design Parameters

System voltage415 V

Cable route length80 m

Maximum voltage drop3.0%

InsulationXLPE

ConductorCopper

Cable arrangement3 & 4 core

Installationin ground

Armour conditionarmoured

Reference conductor temperature90C

Neutral conductorIncluded in multicore construction

Additional correction factor100%

Transformer target loading80%

Generator target loading80%

Generator motor allowance120%

Calculated Results

Connected load425.0 kW

Demand load417.0 kW

Demand apparent power463.3 kVA

Operating current645 A

Design current783 A

Recommended main breaker800 A ACB

Recommended transformer630 kVA

Recommended generator750 kVA

Main cable recommendation	2 × 3 & 4 core × 185 mm²
Installation reference	Cu / XLPE / 3 & 4 core, in ground, armoured
Physical cable pieces	2
Reference current rating	445 A
Corrected ampacity	890 A
Voltage drop	8.1 V (1.96%)
Voltage drop constant	0.26 V/A/km
Resistance / reactance	0.1280 / 0.072 ohm/km

Reference Basis

Current rating and voltage drop from the PDF current-rating table for 3 & 4 core copper XLPE insulated armoured/unarmoured cables.

Ambient correction row: 15°C = 1.04 · 20°C = 1 · 25°C = 0.96 · 30°C = 0.93 · 35°C = 0.89 · 40°C = 0.85 · 45°C = 0.8 · 50°C = 0.76

Confirm short-circuit duty, protection coordination, earthing, neutral sizing, harmonics, and local code compliance before issue for construction.

Cables, Transformer & Generator Sizing

Load schedule

Design parameters

PDF reference basis

Preliminary Sizing Report

Load Schedule

Design Parameters

Calculated Results

Reference Basis