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System Bonding Jumper w/ Busway

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bdm5066

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Location
Pittsburgh, PA
I have an application where we have a unit substation (4160V disconnect switch -> 4160V-480V transformer -> 4000A, 480V switchgear). The transformer secondary and 480V switchgear are hard bussed together. The transformer is to be solidly grounded. For this application, how do I go about sizing the system bonding jumper (which I plan to install in the transformer)?

Table 250.102(C)(1) provides direction for sizing the system bonding jumper if we have cables running from the transformer to our first disconnecting means, but I'm unsure of what to do if that connection is hard bussed instead?

Thanks in advance for your help!
 
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