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Electrical Arc Flash Study

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What is an electrical arc and Arc flash



An Electrical Arc is a bright luminous bridge formed in a gap between two electrodes. An Arc Flash occurs during a short circuit or fault condition which passes through this arc gap


Harmful Effects of Electrical Arc Flash:
  • Expels large amounts of deadly energy
  • Causes an ionization of the air
  • Arc flash temperatures can reach as high as 19,000 Deg C which can cause severe burns and set fire to human clothing
  • Ignites any nearby combustible materials
  • Melts or Vaporizes metals such as Copper, Aluminum and Steel which can cause explosion
  • Bright Flash can result in blindness, to human
  • Sound Blast during Arc Flash can damage human eardrums
Solution from JEF:

An Electrical Arc Flash Study / Analysis as per NFPA 70E (2017) and IEEE 1584 which categorizes arc flash hazard at a specific equipment based on the Arc Energy and identifies the protection boundary

Benefits

  • Ensures safety of human and electrical system
  • Health Assessment of Circuit Breakers
  • Documents current facility conditions of the electrical system and possible safety and code concerns
  • Documents all electrical system components
  • Validates and documents a safe work environment
  • Identifies proper level of PPE required based on the study
  • Provides a baseline for ongoing maintenance and logging of facility changes
  • Ensures a safe work environment in compliance with the NEC 110 applicable articles and NFPA 70E
  • Provides data in a format that allows the end-user to use this data for future system changes, upgrades or NFPA 70E revivifications
Methodology
  • Ensure a valid and updated single line diagram of the electrical system including all loads
  • Perform load flow analysis
  • Perform short circuit analysis
  • Perform breaker co-ordination analysis
  • Use results of all the above analysis for performing arc flash analysis
Deliverable
  • Fault currents at HT and various LT side panels for various operating conditions
  • Recommended breaker (relay) setting value on HT and LT side
  • TCC curve for transformer inrush, cable thermal withstand capability and breaker (relay) curves
  • Arc Flash Boundary
  • Incident Energy
  • Safe Working Distance.
  • PPE Category to be used for each equipment.
  • Equipment Label
Reference Standards:

NFPA 70E (2017)

IEEE 1584