BASIC NEC CODE RULES AND DESIGN PRACTICE

300 350 MCM or 2-1/0 Parallel 240. 350 500 MCM or 2-2/0 Parallel 280 ... The service entrance is the most expensive part of the electrical system to replace. Use a minimum of 25% over the connected load. Include ampacity and panel circuit space both. 50% is preferable. Voltage Drop. ................
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