A seventy-five kVA transformer steps down 480V primary voltage to 208Y/120V secondary voltage. The primary feed consists of one one-and-one-quarter-inch conduit containing three number three copper conductors and one number eight copper ground. The secondary feed runs to panel LCD1 through one two-and-one-half-inch conduit containing four 250 kcmil aluminum conductors and one number four aluminum ground. The system has a short-circuit current rating of 3.4 kiloamperes and includes a transformer ground connection.
T 75KVA XFMR LCD1 480V PRI 208Y/120V SEC #2 PANEL LCD1 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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