BASIC NEC CODE RULES AND DESIGN PRACTICE

500 2-250 MCM Parallel 400. 600 3-3/0 Parallel 480. 700 3-4/0 Parallel 560. 800 3-300 MCM Parallel 640 ... All the buildings served by a common transformer must be reevaluate to insure that the. existing short circuit protection is adequate for the larger transformer required when additional buildings are added to the compound service system ... ................
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