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DC arc-flash

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cranky108

cranky108

Electrical
Jul 23, 2007
6,293
Has anyone looked into the possibility of DC arc-flash in substation control systems? Specifically I am looking at the DC panel, and let through energy available if we remove the main DC breaker instaneious trip.
 
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The 2012 edition of NFPA 70E has an equation for calculating approximate dc arc-flash. There is definitely some hazard at 125 V dc. The results of the calculations are lower than I would have guessed, however.
 
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