Free practice test · Colorado · 2026 NEC

Colorado journeyman electrician practice test

A free practice test for the Colorado journeyman wireman exam: 30 questions on the 2026 NEC, in the proportions of the official outline. No account needed. You get your score by subject and every answer explained.

How this test works

Part	Questions	Time at the exam's pace
Journeyman Wireman	30	80 minutes

Questions are spread over every subject area of the Colorado Journeyman Electrician outline in proportion to the number of questions each area has on the exam. The time is the exam's own minutes per question applied to this test, and the real exam passes at 70 percent. Keep a 2026 NEC open while you work; on the exam it is provided for you.

For code lookup speed, try the NEC code practice test. For the format, timing and what to bring, read the Colorado Journeyman Electrician exam guide.

The test

Question 1Write the trade size 1-1/4 as a decimal. A. 1.14 B. 1.4 C. 0.25 D. 1.25

Question 2A wire pull is measured at 8 ft 9 in. Write this length in decimal feet. A. 8.9 ft B. 8.09 ft C. 8.75 ft D. 105 ft

Question 3A spacer must not be more than 0.6 in thick. Four spacers are measured. Which one is over the limit? A. 5/8 in B. 0.595 in C. 19/32 in D. 0.58 in

Question 4May the required dwelling laundry branch circuit also supply a hallway lighting outlet? A. Yes, if the light is near the laundry area B. No; it supplies only the laundry area receptacle outlets C. Yes, if the circuit is not loaded beyond 80 percent D. Yes, any 20-ampere circuit may supply lighting

Question 5A 20-A circuit supplies the receptacles of only one dwelling bathroom. Apply the exception to 210.11(C)(3). May the same circuit also supply that bathroom's light and exhaust fan? A. Yes, within the limits of 210.23(B)(1) and (B)(2) B. No, bathroom circuits may supply only receptacles C. Yes, and it may also supply the light in a second bathroom D. Yes, with no load limits

Question 6The required 20-A garage branch circuit in a dwelling is also used to supply a receptacle outlet on the front porch. Apply Exception No. 1 to 210.11(C)(4). Is this permitted? A. No, the garage circuit may have no other outlets B. Only if the garage has a single vehicle bay C. Only if the porch receptacle is in the garage wall D. Yes

Question 7A 200-A feeder would normally use 3/0 AWG copper; 250 kcmil copper is installed to reduce voltage drop. Under 250.122(D), what minimum circular-mil area must the copper EGC have? Round to the nearest 100 cmil. A. 26,240 cmil B. 17,600 cmil C. 108,400 cmil D. 39,100 cmil

Question 8A 240-V, single-phase, 40-A branch circuit supplies a 32-A load 400 ft away. 8 AWG copper would be enough for ampacity, but voltage drop is limited to 3 percent. Use CM = 2 × K × I × L ÷ VD with K = 12.9, then choose the smallest Table 8 size with at least that area for the ungrounded conductors. What is the minimum size of the copper EGC? A. 10 AWG B. 4 AWG C. 3 AWG D. 6 AWG

Question 9A feeder protected by a 150-A breaker would normally use 1/0 AWG copper; 250 kcmil copper is installed to reduce voltage drop. What is the minimum size of the copper wire-type EGC? A. 6 AWG B. 4 AWG C. 3 AWG D. 2 AWG

Question 10An 800-A feeder is run as two parallel sets, each set in its own metal conduit, with a wire-type copper EGC in each conduit. What is the minimum size of the EGC in each conduit? A. 1/0 AWG B. 3 AWG C. 3/0 AWG aluminum D. 2/0 AWG

Question 11A branch circuit supplies 24 A of continuous load and 12 A of noncontinuous load. The breaker is not listed for 100 percent operation. What is the minimum standard breaker rating? A. 45 A B. 40 A C. 30 A D. 60 A

Question 12A branch circuit supplies 38 A of continuous load and 4 A of noncontinuous load. The panelboard and breaker assembly is listed for operation at 100 percent of its rating; apply the 210.20(A) Exception. What is the minimum standard breaker rating? A. 60 A B. 40 A C. 70 A D. 45 A

Question 131/0 AWG THHN copper conductors are installed in a 50°C ambient. What is their corrected ampacity, based on the 90°C rating? Round to 0.1 A. A. 112.5 A B. 123.0 A C. 139.4 A D. 207.3 A

Question 143 AWG THWN copper conductors run through a space where the ambient temperature is 104°F. What is their corrected ampacity? Round to 0.1 A. A. 82.0 A B. 91.0 A C. 88.0 A D. 100.0 A

Question 15A box with no clamps and no grounding conductors has six 14 AWG conductors entering it and two single-pole switches, each on its own yoke. What is the required volume? A. 16.00 in.³ B. 22.50 in.³ C. 20.00 in.³ D. 12.00 in.³

Question 16Six 12 AWG equipment grounding conductors enter a box. Under 314.16(B)(5), what volume do the EGCs require? A. 2.25 in.³ B. 13.50 in.³ C. 5.63 in.³ D. 3.38 in.³

Question 17A pier feeder supplies 8 shore-power receptacles rated 50 A, 125/250 V. Applying the Table 120.120 demand factors, what is the demand load on each ungrounded conductor? A. 400 A B. 320 A C. 324 A D. 360 A

Question 18A 120/240-V marina feeder supplies 36 shore-power receptacles rated 30 A, 125 V, connected evenly between the two ungrounded conductors. Applying the Table 120.120 demand factors, what is the demand load on each ungrounded conductor? A. 324 A B. 648 A C. 378 A D. 540 A

Question 19What is the minimum rating of the disconnecting means for a capacitor bank with a rated current of 48 A? A. 55.2 A B. 64.8 A C. 60.0 A D. 48.0 A

Question 20A 12-A capacitor connects to the terminals of a motor whose circuit conductors have an ampacity of 65 A. What is the minimum ampacity of the capacitor conductors? Round only the final answer, to 0.1 A. A. 21.7 A B. 16.2 A C. 65.0 A D. 87.8 A

Question 21A motor-compressor is marked with a rated-load current of 18 A and a branch-circuit selection current of 22 A. What minimum ampacity must its branch-circuit conductors have? A. 22.5 A B. 22 A C. 50 A D. 27.5 A

Question 22A motor-compressor has RLA 30 A and BCSC 33 A. Copper THWN conductors, terminals rated 75°C. What is the minimum branch-circuit conductor size? A. 8 AWG B. 10 AWG C. 6 AWG D. 4 AWG

Question 23A motor-compressor is marked RLA 32 A and LRA 160 A; no branch-circuit selection current is marked. What is the minimum ampere rating of its disconnecting means? A. 184.0 A B. 40.0 A C. 32.0 A D. 36.8 A

Question 24A condensing unit's compressor nameplate reads: RLA 15.6 A, BCSC 18 A, LRA 92 A. The unit's minimum circuit ampacity is marked 22.5 A. What is the minimum ampere rating of the compressor disconnect? Round only the final answer, to 0.1 A. A. 20.7 A B. 25.9 A C. 17.9 A D. 22.5 A

Question 25A 75-kVA, 3-phase transformer has a 480-V primary. Use 1.732 for √3. What is its full-load primary current? Round to 0.1 A. A. 156.3 A B. 52.1 A C. 90.2 A D. 270.6 A

Question 26A single-phase transformer steps 480 V down to 120 V. The secondary carries 40 A. Ignoring losses, what current flows in the primary? A. 160 A B. 40 A C. 2.5 A D. 10 A

Question 27An EVSE is rated 24 A. What minimum branch-circuit conductor ampacity does 210.19(A)(1) require, before any correction or adjustment? A. 24 A B. 30 A C. 27.6 A D. 36 A

Question 28A branch circuit supplies a 46-A continuous load. THHN copper conductors; the terminals are not marked and the circuit is 100 A or less. No correction or adjustment factors apply. What is the minimum conductor size? A. 6 AWG B. 4 AWG C. 8 AWG D. 3 AWG

Question 29A branch circuit supplies an 18-A continuous load. THHN copper (90°C), terminals rated 75°C, in a raceway with 16 current-carrying conductors, 30°C ambient. What is the minimum conductor size? A. 10 AWG B. 12 AWG C. 8 AWG D. 14 AWG

Question 30A branch circuit uses 12 AWG copper with 60°C terminals (20 A). No correction or adjustment applies. What is the largest continuous load it may carry under 210.19(A)(1)? A. 20 A B. 16 A C. 25 A D. 12.8 A

Suggested time: 80 minutes

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Last verified November 11, 2026.