I have a commercial garage, that was done by an unlicensed electrican, without permits and was caught. So I get to be clean up guy. Clean up is going well except for this one issue that has me scratching my head...
"Provide fault current data & calculations & arc flash incident energy at working distance calculations at site for electrical inspection purposes."
This is just a plain repair shop. Plugs, lights, 2 lifts and me with no idea how to do these calculations.:)
Here in ComEd territory the biggest 208V transformer that you can get from them is 750KVA. We just assume the fault current based on that and call it good we you can't get the actual value from the local utility.
You may be able to use the generic information for the arc flash hazard analysis if you meet all the requirements in NFPA 70E 130.3 exception #1. Otherwise you need an Electrical Engineer who has done the calcs before. The fault current used by assuming infinite source before the transformer (as for figuring minimum AIC rating for equipment) may easily leave you under protected during arc fault (see printed info from people such as Peter Walsh and Jim Phillips).
To do the AIC calculations, the above information is good.
Allow me to be picky. The correct phrase is "you can get some info on SCA calcs...". AIC means Amps Interrupting Capacity - this is a rating supplied by the manufacturer you can not calculate it. It is only available by testing. SCA is Short Circuit Amps - this is what you calculate. SCCR is Short Circuit Current Rating - this equipment rating can be determined in the field. NEC 110.9 and 110.10 require that your equipment be rated for the available SCA.
If you want an entire copy of the Bussmann 2008 SPD you have to pay for it. However I have found that you can download the individual sections, one at a time, for free.
#185126 - 03/03/0909:54 PMRe: Fault current data & arc flash calculations?