Gentleman, I have an installation where, due to some monumental blunder, wires designed to be overhead in conduit are now to be run in a concrete trench. These are feeding power to various devices using 12-250kcmil (qty 4 of 3-wires) and qty 2 4-wire of 2/0.
I understand that concrete...
An installed transformer vault has 4 1000kVA transformers 13.8kV - 480V. The utility rates this installation at 200kAIC and (145, j1385) uOhms. There are a couple of issues I am having with this.
1) Why don't the Utility ratings and the xfrm ratings match? Assuming 5% impedance on the...
