A 75kVA transformer designated as LBD1 is fed by a primary circuit utilizing one one-and-one-quarter-inch conduit containing three number-three copper conductors and one number-eight copper ground. The secondary side steps down to 208Y/120V and feeds panel LBD1 through one two-and-one-half-inch conduit containing four two-hundred-fifty thousand circular mil aluminum conductors and one number-four aluminum ground. The short circuit current rating is 3.4 kiloamperes. A ground connection is provided with a number-two conductor.
T 75KVA XFMR LBD1 480V PRI 208Y/120V SEC #2 PANEL LBD1 1 (1)1-1/4"C 3#3 CU, 1#8 CU GND (1)2-1/2"C 4#250 KCMIL AL, 1#4 GND AL ISC = 3.4KA
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