Calculating Ground Bus Bar Short Circuit Current Force

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BlaineXD

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Rockville, MD
I am trying to spec the correct anchoring epoxy and threaded rod depth for a switchgear ground busbar. Hilti has a lot of information on the tension and shear forces based off of the anchor diameters and embedment depth, but I am lost on how to calculate the force created by a bolted fault. (Just for reference, we are using a 50kA bolted fault for basis of design.) Can anyone point me in the right direction? Any help would be appreciated.
Thanks,
--Nate
 
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GoldDigger

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Location
Placerville, CA, USA
Occupation
Retired PV System Designer
Well, the first thing to consider is that the magnetic forces acting on a single conductor are pretty much zero. There is, however, a force between any two current carrying conductors which is proportional to the product of the two currents.
The force per linear foot between two parallel current carrying wires as a function of the currents and the separation is easy physics. Figuring out all the combinations of parts that will be involved in forces on the ground bar is a more complex question.
 
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