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Arc Flash and available fault current

Arc Flash and available fault current

Arc Flash and available fault current

(OP)
Arc flash calculation methods always warn the engineer not to use too conservative a number for available fault current.  If this number is too high, the arc flash hazard can look confortably low, although the real risk is higher.  

However, when I call utilities, they never can provide any more accurate available fault current numbers.  In fact, many of them give me a dumb look when I mention I am doing arc flash calculations. "Use the most conservative Available Fault Current number, just figure that the utility transformer is backed up to Hoover Dam!" they exclaim. Last time I called one of these utility engineers, they said they routinely do not have available fault current calcs any closer than the nearest substation, which is a mile away.  

How do people handle this situation?  

  

RE: Arc Flash and available fault current

Do a search on this site,..it's been talked about a few times I believe.

Mike

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