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Arc Flash calculations in IEEE 1584

Arc Flash calculations in IEEE 1584

Arc Flash calculations in IEEE 1584

(OP)
How is there a min. and a max. fault current?
What causes a min. and a max.?
Thanks

RE: Arc Flash calculations in IEEE 1584

If you're looking at section 4.3 step 2 of IEEE-1584:

There are minimum and maximum bolted fault currents based on the strength of the power system.  For example, say your plant is fed from a high voltage line between two utility substations.  With both substations feeding your plant, you may have a "maximum" amount of fault current available.  With the "stronger" substation de-energized, you are only fed through the "weaker" substation and therefore you have a "minimum" amount of fault current available.
 

RE: Arc Flash calculations in IEEE 1584

I assume you are asking about an arc flash study, minimum could also be refering to the minimum arcing current that will self sustain.  

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