100+ Free CO Electrician Practice Questions

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According to the NEC 2023 as adopted by Colorado, what is the definition of a 'branch circuit'?

The circuit conductors between the final overcurrent device and the outlet(s)

The circuit conductors between the service point and the main disconnect

The circuit conductors between the transformer and the service entrance

The circuit conductors between two panelboards

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Key Facts: CO Electrician Exam

70%

Passing Score

DORA

Questions

4-hour limit

$75-100

Exam Fee

PSI

NEC 2023

Code Edition

DORA

Colorado's journeyman electrician exam is based on the NEC 2023 and administered by PSI under DORA. The exam has 80 questions with a 4-hour time limit and requires 70% to pass. Colorado recently passed SB 25-165 affecting electrical licensing. The exam fee is approximately $75-100.

Sample CO Electrician Practice Questions

Try these sample questions to test your CO Electrician exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1According to the NEC 2023 as adopted by Colorado, what is the definition of a 'branch circuit'?

A.The circuit conductors between the final overcurrent device and the outlet(s)

B.The circuit conductors between the service point and the main disconnect

C.The circuit conductors between the transformer and the service entrance

D.The circuit conductors between two panelboards

Explanation: Per NEC Article 100, a branch circuit is defined as the circuit conductors between the final overcurrent device protecting the circuit and the outlet(s). This is fundamental to understanding electrical system layout.

2Under Colorado's NEC 2023 adoption, what is the definition of a 'continuous load'?

A.A load operating for 1 hour or more

B.A load where maximum current continues for 3 hours or more

C.Any load that operates continuously

D.A load exceeding 80% of circuit capacity

Explanation: Per NEC Article 100, a continuous load is one where the maximum current is expected to continue for 3 hours or more. This affects sizing of conductors and overcurrent devices.

3Per the NEC 2023 as adopted in Colorado, what is the minimum headroom required for working spaces about electrical equipment rated 600V or less?

A.6 feet

B.6 feet 3 inches

C.6 feet 6 inches

D.7 feet

Explanation: Per NEC Section 110.26(A)(3), the minimum headroom for working spaces around electrical equipment rated 600V or less is 6 feet 6 inches (6.5 feet), or the height of the equipment, whichever is greater.

4According to the NEC 2023 adopted by Colorado, what is the required working space width in front of electrical equipment?

A.24 inches minimum

B.30 inches or the width of the equipment, whichever is greater

C.36 inches minimum

D.48 inches minimum

Explanation: Per NEC Section 110.26(A)(2), the working space width must be at least 30 inches or the width of the equipment, whichever is greater.

5Per NEC 2023 in Colorado, what is the minimum depth of working space for Condition 1 at 0-150V to ground?

A.2.5 feet

B.3 feet

C.3.5 feet

D.4 feet

Explanation: Per NEC Table 110.26(A)(1), Condition 1 (exposed live parts on one side only) for equipment rated 0-150V to ground requires a minimum working space depth of 3 feet.

6In Colorado, what is the minimum trade size for EMT per the NEC?

A.1/4 inch

B.3/8 inch

C.1/2 inch

D.3/4 inch

Explanation: Per NEC Section 358.20(A), the minimum trade size for EMT is 1/2 inch (metric designator 16).

7Per the NEC 2023 adopted in Colorado, what is the maximum height for the center of a disconnect handle?

A.5 feet 6 inches

B.6 feet

C.6 feet 7 inches

D.7 feet

Explanation: Per NEC Section 404.8(A), the center of the operating handle must not be more than 6 feet 7 inches (2.0 m) above the floor when in its highest position.

8Per NEC 2023 in Colorado, what is the maximum flexible cord length for a garbage disposal?

A.18-36 inches

B.24-48 inches

C.12-24 inches

D.36-60 inches

Explanation: Per NEC Section 422.16(B)(1), a cord-connected garbage disposal must use a flexible cord between 18 and 36 inches in length.

9Under Colorado's NEC adoption, what is the minimum conductor size for a 20-ampere branch circuit?

A.14 AWG copper

B.12 AWG copper

C.10 AWG copper

D.8 AWG copper

Explanation: Per NEC Section 210.3 and Table 210.3, a 20-ampere branch circuit requires a minimum of 12 AWG copper.

10Per the NEC 2023 in Colorado, what is the minimum conductor size for a 15-ampere branch circuit?

A.18 AWG

B.16 AWG

C.14 AWG copper

D.12 AWG copper

Explanation: Per NEC Section 210.3, the minimum conductor size for a 15-ampere branch circuit is 14 AWG copper.

About the CO Electrician Exam

The Colorado journeyman electrician exam is administered by PSI under the DORA State Electrical Board. It tests NEC 2023 knowledge including electrical theory, wiring methods, grounding, load calculations, and Colorado-specific amendments including recent SB 25-165 updates.

Questions

80 scored questions

Time Limit

4 hours

Passing Score

70%

Exam Fee

$75-100 (Colorado DORA State Electrical Board)

CO Electrician Exam Content Outline

25%

Wiring Methods & Materials

Raceways, cables, conduit fill, conductor ampacity, and Colorado amendments

20%

Grounding & Bonding

Article 250, grounding electrode systems, equipment grounding, bonding

20%

Branch Circuits & Overcurrent Protection

Conductor sizing, GFCI/AFCI, receptacle spacing, overcurrent devices

20%

Load Calculations & Services

Dwelling and commercial calculations, demand factors, service entrance, feeders

15%

Motors, Special Occupancies & NEC General

Motor circuits, transformers, hazardous locations, healthcare, pools, NEC definitions

How to Pass the CO Electrician Exam

What You Need to Know

Passing score: 70%
Exam length: 80 questions
Time limit: 4 hours
Exam fee: $75-100

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

CO Electrician Study Tips from Top Performers

1Master NEC Article 250 (Grounding and Bonding) — heavily tested on Colorado's exam

2Practice dwelling unit load calculations per NEC Article 220

3Memorize conductor ampacity from Table 310.16 at 75°C

4Study Colorado-specific amendments and SB 25-165 impacts

5Review motor circuit requirements in Article 430

Frequently Asked Questions

What NEC edition does Colorado use?

Colorado uses the NEC 2023 edition, adopted by the DORA State Electrical Board. Recent legislation (SB 25-165) has updated licensing requirements.

Who administers the Colorado electrician exam?

The exam is administered by PSI on behalf of the DORA State Electrical Board. Schedule through PSI after DORA application approval.

What is SB 25-165?

SB 25-165 is recent Colorado legislation affecting the State Electrical Board and licensing requirements. Check DORA for the latest updates on how it affects exam requirements.

What experience is required?

Colorado requires completion of an approved apprenticeship or equivalent experience under a licensed electrician, typically 8,000 hours.