When can Arc Flash occur ?

Arc Flash occurs when insulation or isolation between electrified conductors is breached or can no longer withstand the applied voltage.
When can Arc Flash occur ?

Arc Flash occurs when insulation or isolation between electrified conductors is breached or can no longer withstand the applied voltage.

What are causes of Arc Flash in ASSEMBLY ?

Probbable causes may be :
Dust Accumulation
Corrosion
Dielectric Breakdown
Faulty Equipment
Poor Maintenance
Tool Dropped into Assembly
Careless Removal or Replacement of Cover or Switchgear
Entry of Foreign Bodies
missalignment of moving contacts

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    Arc Flash Hazard Risk Category

    HRC – Hazard Risk Category is determined by amount of Incident Energy released upto defined boundary from the source of Arc Flash Point.

    DC Utilization Categories IEC 60947

    Utilization Categories indicate the type of Load and Duty Cycle of the load basis which selection of Switchgear should be done for the intended application.

    Let Through Energy

    I2t – Let through Energy is available thermal energy resulting from Current Flow during circuit opening. I2t (of circuit breaker) < K2S2 (of cable)