See www.EngineeringExamTools.com for HP calculators that are already pre-programmed for selected exams, including the Civil PE, Electrical PE and FE exams. These products are designed to help you pass, and the NCEES calculator policy has no restrictions on the use of programmed calculators...
I took the Electrical power exam and I have a few general recommendations:
Make sure you fully understand 3-phase systems and how to convert the voltages and current, since this applies to so many different question types on the power exam, including transformers, motors, generators...
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