Electrical System Study and Design Services

Electrical System Studies (ESS) is a specialist branch of LEW services unique to ON Engineers and few electrical services providers.

With decades of ESS experience and application of industry leading software, ON Engineers is able to provide comprehensive ESS solutions to our clients covering a wide range of modules including Arc Flash, Short Circuit Analysis, Relay Coordination, Harmonic Analysis, Load Flow and Motor Starting Computation.

Our engineers work with the client and licensed electrical worker (LEW) on projects ranging from new builds, plant extensions and equipment upgrades.

Using ETAP and SKM software, our services include:

  • Arc Flash Study (IEEE 1584 and NFPA 70E)
  • Battery Sizing and Discharge (IEEE 308, 485 and 946)
  • Cable Ampacity Calculation (IEEE 399, BS 7671 and IEC 60364)
  • Cable Sizing
  • Ground Grid Design Assessment (IEEE 80)
  • Harmonic Filters and Sizing Study
  • Harmonic Frequency Scan
  • Harmonic Load Flow (IEE 519)
  • Load Flow Analysis
  • Machine Parameter Estimation
  • Motor Starting Analysis
  • Optimal Capacitor Placement Analysis
  • Optimal Power Flow Analysis
  • Protective Device Coordination
  • Reliability Assessment Analysis
  • Short Circuit Study (IEC 909)
  • Transient Stability Calculation
  • Unbalanced Load Flow Analysis
  • Underground Thermal Analysis


For enquiries, kindly contact us at : +65 6795 4666 or : general@onengineers.com.