Colorado Journeyman
Electrician Exam: S-Tier
Universal Mastery Test Bank |
QA + Detailed Rationales
Table of Contents
*(#part-i-master-exam-strategy-and-core-axioms) *(#the-2026-colorado-regulatory-environment)
*(#s-tier-performance-statistics-and-apprentice-ratios)
*(#administrative-enforcement-and-civil-penalty-structure)
*(#key-technical-calculations-formulas) *(#part-ii-s-tier-mastery-test-questions)
*(#tier-1-foundational-syntax-and-code-calculations-questions-115)
*(#tier-2-complex-application-and-job-site-simulations-questions-1635)
*(#tier-3-grandmaster-synthesis-and-regulatory-mandates-questions-3660)
Part I: Master Exam Strategy and Core Axioms
The 2026 Colorado Regulatory Environment
Under the jurisdiction of the Colorado State Electrical Board within the Department of
Regulatory Agencies (DORA), the legal administration of electrical work is strictly bound to the
state-adopted National Electrical Code (NEC) and the Colorado Revised Statutes (C.R.S.).
According to the Board’s rulemaking hearing held on Wednesday, May 27, 2026, Colorado is
formally adopting the 2026 edition of the NEC.
For candidates sitting for the Colorado Journeyman Wireman Exam administered by PSI,
navigating an unmarked, tabless, and un-highlighted codebook provided at the test center is a
non-negotiable condition of testing. Success requires rapid physical lookup, deep conceptual
clarity, and precise mathematical application under strict time constraints (90 scored questions
plus up to 10 unscored items across 240 minutes, needing a 70% passing score of 63 correct
answers).
S-Tier Performance Statistics and Apprentice Ratios
,The licensing framework in Colorado establishes rigorous training gates, including 8,000 hours
of practical experience (with at least 4,000 commercial/industrial hours) completed over no less
than 4 years, alongside 288 hours of classroom education. Grounding and bonding is the single
heaviest subject on the examination (14 questions), followed immediately by electrical
calculations (9 questions).
A critical compliance gate is the supervisor-to-apprentice ratio on job sites. Under C.R.S. §
12-115-115, the Colorado State Electrical Board enforces strict, progressive supervision
standards designed to enhance job site safety and educational fidelity.
Job-Site Classification Before July 1, 2025 Effective July 1, 2025 Effective July 1, 2028
Residential Job Sites 1 Licensed : 3 1 Licensed : 3 1 Licensed : 3
(1- to 4-Family Apprentices Apprentices Apprentices
Dwellings)
Nonresidential Job 1 Licensed : 3 1 Licensed : 2 1 Licensed : 1
Sites Apprentices Apprentices Apprentice
(Commercial/Industrial)
Administrative Enforcement and Civil Penalty Structure
Colorado State Electrical Inspectors and designated compliance officers perform random,
contemporaneous job site audits to verify licensing credentials, apprentice registrations, and
supervision ratios. Violations result in immediate citations, administrative fines under 3 CCR
710-1.10, stop-work orders, or criminal prosecution as Class 2 misdemeanors.
Violation Category Statutory Provision 1st Offense Fine 2nd Offense Fine Subsequent
Offenses
Unlicensed § 12-115-109(1) $225 $600 Up to $2,000 / day
Journeyman
Activity
Unlicensed Master § 12-115-109(1) $300 $600 Up to $2,000 / day
Activity
Unregistered § 12-115-110(5)(a) $750 $1,500 Up to $2,000 / day
Contractor
Operation
Unregistered § 12-115-115(3) $225 $600 Up to $2,000 / day
Apprentice
Employment
Failure to Maintain § 12-115-115(1) $375 $600 Up to $2,000 / day
Supervisory Ratio
Failure to Obtain § 12-115-120 $375 $900 Up to $2,000 / day
Permit or
Inspection
Failure to Produce § 12-115-122(1)(b) $50 $200 Up to $2,000 / day
License /
Registration
Non-Qualified § 12-115-113(1)(r) $375 $900 Up to $2,000 / day
Permit Application
Key Technical Calculations Formulas
For the calculations portion of the examination, candidates must be fluent in applying core
, mathematical formulas without relying on memorization :
● Ohm's Law:
● Watt's Law (Single-Phase Power):
● Three-Phase Power:
● Single-Phase Voltage Drop:
● Three-Phase Voltage Drop:
Part II: S-Tier Mastery Test Questions
Tier 1: Foundational Syntax and Code Calculations (Questions 1–15)
Q1: A commercial electrical panelboard operating at 120/208-volt, three-phase, 4-wire is
mounted on a wall opposite a brick block wall. Based on the principles of NEC Table
110.26(A)(1), what is the minimum required depth of clear working space in front of the
panelboard? A) 30 inches B) 36 inches C) 42 inches D) 48 inches
● The Answer: C (42 inches)
● Distractor Analysis:
○ A is incorrect: 30 inches is the minimum width of the working space, not the depth.
○ B is incorrect: 36 inches is only permitted for Condition 1 (non-grounded opposing
surfaces), but brick is classified as a grounded surface (Condition 2). * D is
incorrect: 48 inches is required for Condition 3 (exposed live parts on both sides of
the working space).
The Mentor's Analysis: Clear working space protects technicians from arc-flash and
ground-fault hazards. When facing low-voltage panelboard layout tasks, the immediate priority
is identifying the presence of grounded vs. ungrounded surfaces opposing the energized
equipment. By utilizing Table 110.26(A)(1), the installer bypasses the common trap of
under-sizing working clearances in commercial rooms. Professional/Academic Intuition:
Opposing brick, concrete, or tile surfaces are classified as grounded (Condition 2),
requiring a minimum of 42 inches of clear depth for systems operating up to 150 volts to
ground.
Double-space
Q2: A 200-ampere single-phase service is supplied by #2/0 AWG copper ungrounded
service-entrance conductors. A concrete-encased electrode (Ufer ground) is established as the
primary grounding electrode. Based on the principles of NEC 250.66(B), what is the maximum
required size of the copper grounding electrode conductor (GEC)? A) #8 AWG B) #6 AWG C)
#4 AWG D) #2 AWG
● The Answer: C (#4 AWG)
● Distractor Analysis:
○ A is incorrect: #8 AWG is the minimum permitted size for GECs under certain
conditions but is mechanically too fragile for direct concrete-encased connections
without protection.
○ B is incorrect: #6 AWG copper is the maximum required size for GECs connected to
made electrodes (such as rods or pipes) but not concrete-encased systems.
○ D is incorrect: #2 AWG is based on Table 250.66 for a general water pipe
connection but represents an over-sizing error for a concrete-encased electrode.
The Mentor's Analysis: Concrete-encased grounding electrodes possess a highly effective
mechanical interface with the earth, which saturates its current-carrying capability early during a
Electrician Exam: S-Tier
Universal Mastery Test Bank |
QA + Detailed Rationales
Table of Contents
*(#part-i-master-exam-strategy-and-core-axioms) *(#the-2026-colorado-regulatory-environment)
*(#s-tier-performance-statistics-and-apprentice-ratios)
*(#administrative-enforcement-and-civil-penalty-structure)
*(#key-technical-calculations-formulas) *(#part-ii-s-tier-mastery-test-questions)
*(#tier-1-foundational-syntax-and-code-calculations-questions-115)
*(#tier-2-complex-application-and-job-site-simulations-questions-1635)
*(#tier-3-grandmaster-synthesis-and-regulatory-mandates-questions-3660)
Part I: Master Exam Strategy and Core Axioms
The 2026 Colorado Regulatory Environment
Under the jurisdiction of the Colorado State Electrical Board within the Department of
Regulatory Agencies (DORA), the legal administration of electrical work is strictly bound to the
state-adopted National Electrical Code (NEC) and the Colorado Revised Statutes (C.R.S.).
According to the Board’s rulemaking hearing held on Wednesday, May 27, 2026, Colorado is
formally adopting the 2026 edition of the NEC.
For candidates sitting for the Colorado Journeyman Wireman Exam administered by PSI,
navigating an unmarked, tabless, and un-highlighted codebook provided at the test center is a
non-negotiable condition of testing. Success requires rapid physical lookup, deep conceptual
clarity, and precise mathematical application under strict time constraints (90 scored questions
plus up to 10 unscored items across 240 minutes, needing a 70% passing score of 63 correct
answers).
S-Tier Performance Statistics and Apprentice Ratios
,The licensing framework in Colorado establishes rigorous training gates, including 8,000 hours
of practical experience (with at least 4,000 commercial/industrial hours) completed over no less
than 4 years, alongside 288 hours of classroom education. Grounding and bonding is the single
heaviest subject on the examination (14 questions), followed immediately by electrical
calculations (9 questions).
A critical compliance gate is the supervisor-to-apprentice ratio on job sites. Under C.R.S. §
12-115-115, the Colorado State Electrical Board enforces strict, progressive supervision
standards designed to enhance job site safety and educational fidelity.
Job-Site Classification Before July 1, 2025 Effective July 1, 2025 Effective July 1, 2028
Residential Job Sites 1 Licensed : 3 1 Licensed : 3 1 Licensed : 3
(1- to 4-Family Apprentices Apprentices Apprentices
Dwellings)
Nonresidential Job 1 Licensed : 3 1 Licensed : 2 1 Licensed : 1
Sites Apprentices Apprentices Apprentice
(Commercial/Industrial)
Administrative Enforcement and Civil Penalty Structure
Colorado State Electrical Inspectors and designated compliance officers perform random,
contemporaneous job site audits to verify licensing credentials, apprentice registrations, and
supervision ratios. Violations result in immediate citations, administrative fines under 3 CCR
710-1.10, stop-work orders, or criminal prosecution as Class 2 misdemeanors.
Violation Category Statutory Provision 1st Offense Fine 2nd Offense Fine Subsequent
Offenses
Unlicensed § 12-115-109(1) $225 $600 Up to $2,000 / day
Journeyman
Activity
Unlicensed Master § 12-115-109(1) $300 $600 Up to $2,000 / day
Activity
Unregistered § 12-115-110(5)(a) $750 $1,500 Up to $2,000 / day
Contractor
Operation
Unregistered § 12-115-115(3) $225 $600 Up to $2,000 / day
Apprentice
Employment
Failure to Maintain § 12-115-115(1) $375 $600 Up to $2,000 / day
Supervisory Ratio
Failure to Obtain § 12-115-120 $375 $900 Up to $2,000 / day
Permit or
Inspection
Failure to Produce § 12-115-122(1)(b) $50 $200 Up to $2,000 / day
License /
Registration
Non-Qualified § 12-115-113(1)(r) $375 $900 Up to $2,000 / day
Permit Application
Key Technical Calculations Formulas
For the calculations portion of the examination, candidates must be fluent in applying core
, mathematical formulas without relying on memorization :
● Ohm's Law:
● Watt's Law (Single-Phase Power):
● Three-Phase Power:
● Single-Phase Voltage Drop:
● Three-Phase Voltage Drop:
Part II: S-Tier Mastery Test Questions
Tier 1: Foundational Syntax and Code Calculations (Questions 1–15)
Q1: A commercial electrical panelboard operating at 120/208-volt, three-phase, 4-wire is
mounted on a wall opposite a brick block wall. Based on the principles of NEC Table
110.26(A)(1), what is the minimum required depth of clear working space in front of the
panelboard? A) 30 inches B) 36 inches C) 42 inches D) 48 inches
● The Answer: C (42 inches)
● Distractor Analysis:
○ A is incorrect: 30 inches is the minimum width of the working space, not the depth.
○ B is incorrect: 36 inches is only permitted for Condition 1 (non-grounded opposing
surfaces), but brick is classified as a grounded surface (Condition 2). * D is
incorrect: 48 inches is required for Condition 3 (exposed live parts on both sides of
the working space).
The Mentor's Analysis: Clear working space protects technicians from arc-flash and
ground-fault hazards. When facing low-voltage panelboard layout tasks, the immediate priority
is identifying the presence of grounded vs. ungrounded surfaces opposing the energized
equipment. By utilizing Table 110.26(A)(1), the installer bypasses the common trap of
under-sizing working clearances in commercial rooms. Professional/Academic Intuition:
Opposing brick, concrete, or tile surfaces are classified as grounded (Condition 2),
requiring a minimum of 42 inches of clear depth for systems operating up to 150 volts to
ground.
Double-space
Q2: A 200-ampere single-phase service is supplied by #2/0 AWG copper ungrounded
service-entrance conductors. A concrete-encased electrode (Ufer ground) is established as the
primary grounding electrode. Based on the principles of NEC 250.66(B), what is the maximum
required size of the copper grounding electrode conductor (GEC)? A) #8 AWG B) #6 AWG C)
#4 AWG D) #2 AWG
● The Answer: C (#4 AWG)
● Distractor Analysis:
○ A is incorrect: #8 AWG is the minimum permitted size for GECs under certain
conditions but is mechanically too fragile for direct concrete-encased connections
without protection.
○ B is incorrect: #6 AWG copper is the maximum required size for GECs connected to
made electrodes (such as rods or pipes) but not concrete-encased systems.
○ D is incorrect: #2 AWG is based on Table 250.66 for a general water pipe
connection but represents an over-sizing error for a concrete-encased electrode.
The Mentor's Analysis: Concrete-encased grounding electrodes possess a highly effective
mechanical interface with the earth, which saturates its current-carrying capability early during a
