A 75kVA transformer designated as LAD1 steps down 480V primary voltage to 208Y/120V secondary voltage. The primary feeder consists of one 1-1/4-inch conduit containing three number 3 copper conductors and one number 8 copper ground conductor. The secondary feeder comprises one 2-10/12-inch conduit containing four 250 kcmil aluminum conductors and one number 4 aluminum ground conductor feeding panel LAD1. The available fault current is indicated as 3.4 kiloamperes.
T 75KVA XFMR LAD1 480V PRI 208Y/120V SEC #2 PANEL LAD1 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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