The largest size copper GEC required to be used to building steel from a 400-A main breaker panelboard fed from a transformer with three parallel sets of 1/0 AWG is which AWG?

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Prepare for the Independent Electrical Contractors (IEC) Year 4 Exam. Access flashcards, multiple choice questions, and detailed explanations. Enhance your readiness and achieve your certification!

Multiple Choice

The largest size copper GEC required to be used to building steel from a 400-A main breaker panelboard fed from a transformer with three parallel sets of 1/0 AWG is which AWG?

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