three phase formula

Calculating a Three Phase Formula for the Texas NEC License Test

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Three Phase Formula

Today we are sharing a super quick tip with you.  The biggest error that most test takers make is when calculating a three phase formula.  A three phase system must have the voltage multiplied times a factor of 1.73.  (Or the square root of 3.)  Without getting into heavy math or complex electrical theory; three-phase voltages must be multiplied by 1.73 at all times.

three phase formula

We hope this helps get you started. If you are truly serious and intent on passing the electrical license exam, register for the 2-day crash course today and get that license in your pocket.  Remember, your license application expires after 12 months. Get it done!

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Houston – PSI Electrician License Exam Prep Seminar

Dallas, TX. – PSI Electrician License Exam Prep Seminar

Austin, TX. PSI Electrician License Exam Prep Seminar

Aside from covering three phase formula and other calculations, we cover all 10 subject areas and 22 categories that are in the actual exam.

Agenda & Subject Areas covered for the Texas electrical exam

  • General Electrical Theory and Math Review
  • Definitions, Calculations, Theory and Plans
  • Test taking tips and information
  • Wiring Methods, Materials, Installations
  • Branch Circuits
  • Motors and Generators
  • AC and Refrigeration Loads
  • Transformers
  • Grounding and Bonding
  • Electrical Services
  • Special Occupancies
  • Service Equipment and Conditions
  • Separately Derived Systems
  • Electrical Feeders
  • Branch Calculations and Conductors
  • Electrical Equipment and Devices
  • Electrical Control Devices and Disconnecting Means


“I wanted to thank you. I took your course last August. The study guide I was sent home with help me tremendously in my preparation for my exam. Yesterday I took and passed the Journeyman exam in Dallas. Once again thanks. ” Richard M


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This 2-day seminar will guide you step-by-step on the formulas, calculations, code sections, index practice, and guides that are essential knowledge for passing the exam.

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