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Colorado Residential Wireman NEC 2023 exam preparation



Ready to enroll or have questions? Please contact Daniela Gonzalez (303) 916-0020, or click Add to Cart

Colorado Residential Wireman Exam Preparation is our specialty since 1972. School enrollment is complete with Home Study Computer Program, Tutoring, and Live Seminars with real questions, answers, code references, and calculations to prepare you for the actual PSI state licensing exam.

Custom Home Study Computer Program running on your personal PC

Our sample exams simulate your actual PSI state exam!

Below are a few questions from your upcoming PSI state exam:

  1. What would be the calculated volume allowance for the following equipment?
        • One switch connected with two 12 AWG conductors
        • One switch connected with two 14 AWG conductors
    • Correct Answer: NEC – 314.16(B)(1-5) Box Fill Calculation, Table 314.16(B). Calculate the following: 
    • Switch #1 connected to the 12 AWG wires: 2 x 2.25 = 4.50 cu-in.
    • Switch #2 connected to the 14 AWG wires: 2 x 2.00 = 4.00 cu-in.
    • Two (2) 12 AWG conductors: 2 x 2.25 = 4.50 cu-in.
    • Two (2) 14 AWG conductors: 2 x 2.00 = 4.00 cu-in.
    • Sum total = 17.00 cubic inches.
  2. What is the calculated minimum ampacity rating of the branch circuit conductors given the following residential appliance?
        • Power: Single-phase
        • Operating Voltage: 120 Volts
        • Nameplate Rating: 1,400 Watts
    • Correct Answer: Using the Ohm’s Law Formula Wheel: I = P/E = 1,400 Watts / 120 Volts = 11.67 amperes.
  3. Using the optional method of service calculation, calculate the size (in amperes) of a 120/240-volt service disconnecting means when the total load of a one-family dwelling is 67,500 VA (ignoring or excluding air conditioning loads as well as heating loads)?
    • Correct Answer: 220.82, Example D2(a) Optional Calculation for One-Family Dwelling, see steps below.
    • Subtract 10 kVA from the total load = 67,500 VA – 10,000 VA = 57,500 VA.
    • Multiply the remainder by 40% = 57,500 x 40% = 23,000 VA.
    • Add the 10 kVA back to the derated portion = 23,000 VA + 10,000 VA = 33,000 VA.
    • Calculate current load: I = P/E = 33,000 VA / 240 V = 137.5 A.
    • Per Table 240.6(A) size up to a standard of 150 amperes.

The NEC Codebook and all reference materials are all provided by PSI at the exam testing location. Do NOT bring your personal NEC, but do bring two valid forms of identification.

      • NEC 2023

Our interactive Exam Prep Program allows each license candidate to prepare and study for his state examination while in the comfort of his own home. Our practice exams actually simulate the experience of taking the computerized state examination. The questions, multiple choice answers, and article references have been professionally prepared by our research team to cover every subject area, code section, and calculations. Our sample tests questions are scrambled each time you test to simulate your actual state test experience.

This excellent program can be purchased and installed in just minutes, allows unlimited study and review time for a three month period, and runs on any Windows or Mac computer with an operating system. The program will run on your laptop without internet access allowing on-the-go study preparation.

Candidates for state licensure must now pass an exam administered by PSI prior to submitting an application for licensure. See the recommended steps listed below:

    1. Study to pass your state exam on the first try with our Home Study Computer Program (Click ADD TO CART above)
    2. Register to take your exam online at or call (855) 898-0710
    3. Schedule an appointment to take the examination with PSI
    4. Take and pass the state exam
      • You must bring two valid forms of identification
      • Arrive 30 minutes prior to the scheduled examination appointment.
    5. File a license application with the Board at

Colorado Division of Professions and Occupations Online Services (DORA):

Electrical web address:
State Electrical Board, 1560 Broadway, Suite 1350, Denver, CO 80202. (303) 894-7800

Why Wait? Call Daniela Today! (303) 916-0020