Parallels 3 to 2 junction

H

Hvactrician

Member
Location
Walworth Cty Wisconsin
Occupation
Registered electrician
I have a 800 amp for 480V panel that is installed in a factory. Currently it is fed with two parallel runs of 500 KCM wire phase conductors with a reduced neutral and a #3 ground. We will be refeeding the 800 amp subpanel from a different service. We are using an 800 A breaker that has triple lugs per phase max size of 500kcm. Is it acceptable for me to run 3 parallel runs of 400kcm to a j box and then junction the parallels and feed 2 runs of 600kcm the rest of the way to the panel? All loads in the 800 amp panel are 480v 3wire. On average the current draw on this panel runs between 400 to 550. Due to size of the facility there are three separate services on the building. Because they recently started another addition we are re-distributing existing power to more evenly distribute the load on the existing electrical services. Because of the current conduits entering the subpanel, adding an additional third run to evenly split parallels into three for the entire length of the run would present a problem. Especially with keeping our runs of equal length.
 
Hvactrician said:
We will be refeeding the 800 amp subpanel from a different service. We are using an 800 A breaker that has triple lugs per phase max size of 500kcm. Is it acceptable for me to run 3 parallel runs of 400kcm to a j box and then junction the parallels and feed 2 runs of 600kcm the rest of the way to the panel?
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That would be code complaint although it might be easier to just change the terminals in the breaker.
 
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