Verify results and send feedback if a discrepancy is found. The method uses the dc maximum power method and a multiplying factor instead of using distance exponents. Repeat Step 6 using the reduced arcing currents. This paper suggests a method for calculating the incident energy and the arc flash boundary (AFB) distance for dc systems when an arc-in-a-box situation is involved. Repeat Step 5 using the reduced arcing currents. Repeat Step 4, Reduced Intermediate Currents Repeat Step 4 using Reduced Arcing Current E arc_600, E arc_2400, or E arc_14300 (J / cm 2) Restricted boundary The area closest to the live. Limited approach boundary Moving toward the energized and exposed equipment, you’ll find the limited approach boundary. Step 8: (To account for the arcing current variations)Īrcing Current Variation Correct Factor ( 1 - 0.5 VarC f )įinal Values of Arcing Current using the Correction Factor I arc (kA) and T (ms) Arc flash boundary The arc flash boundary, or restricted approach boundary, changes depending on the potential arc flash. Intermediate Value of Arc-Flash Boundary AFB 600, AFB 2400, or AFB 14300(mm)įinal Arc-Flash Boundary AFB 1, AFB 2 AFB 3, and AFB (mm) Intermediate Value of Incident Energy E arc_600, E arc_2400, or E arc_14300 (J / cm 2)įinal Value of Incident Energy E E 600, E 2700, E 14300 and E ≤600 (J / cm 2) data.Įnclosure Size Equivalent Height and Width Correction Factor CF, ESS
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