Arizona CR-11 Electrical Contractor Exam Study
Guide |Best High-Yield Board-Style Practice
Questions with Detailed NEC, OSHA, and AZ ROC
Rationales (Latest 2026) PDF
Intro Summary:
Are you studying for the high-stakes Arizona CR-11 Residential and Commercial Electrical Contractor
Exam ? Don't leave your contracting license to chance! Pass the AZ ROC trade and regulatory assessment
on your very first attempt with this premium study bundle.
This study guide contains 100 highly realistic, board-style multiple-choice questions meticulously
drafted to align with the actual Arizona Registrar of Contractors (AZ ROC) and PSI testing specifications.
Each question features the correct answer clearly highlighted along with step-by-step mathematical
calculations, NEC code citations, OSHA safety rules, and Arizona contract law rationales .
Key Subject Areas Covered:
National Electrical Code (NEC) Core Mastery – Grounding & bonding sizing (Article 250), box fill
calculations, conduit spacing, and hazardous locations (Class I, Div 1).
Electrical Load Sizing & Calculations – Motor branch circuits (FLC/FLA parameters), continuous
commercial lighting adjustments (125% rule), 3-phase power calculations, and ampacity derating.
OSHA 1926 Construction Safety Protocols – Clear working space parameters (110.26),
Lockout/Tagout (LOTO) rules, arc flash mitigation, trenching depth egress, and PPE requirements.
Arizona Revised Statutes & Registrar of Contractors (AZ ROC) Law – CR-11 uncapped
contracting limits, 20-day preliminary notices, mechanics' liens, 60-day qualifying party
replacement timelines, and consumer protection surety bonds.
Accelerate your learning, eliminate exam day anxiety, and launch your electrical contracting business in
Arizona today!
Section 1: NEC Requirements, Grounding, and Bonding
1. According to NEC Article 250, what is the minimum size copper grounding electrode
conductor required for a service supplied by 3/0 AWG copper service-entrance conductors?
A) 8 AWG
B) 4 AWG
C) 6 AWG
D) 2 AWG
Rationale: Per NEC Table 250.66, for service-entrance conductors of 2/0 AWG or 3/0 AWG
copper, the minimum size of the grounding electrode conductor required is 4 AWG copper.
,2. What is the maximum distance permitted between supports for a vertical run of 2-inch Rigid
Metal Conduit (RMC) according to the NEC?
A) 10 feet
B) 12 feet
C) 14 feet
D) 20 feet
Rationale: NEC Table 344.30(B)(2) permits 2-inch RMC runs to be supported at intervals up
to 14 feet for vertical risers provided the conduit is made up with threaded couplings.
3. Which of the following is defined by the NEC as a reliable connection to ensure electrical
conductivity between metal parts required to be electrically connected?
A) Grounding
B) Bonding
C) Isolation
D) Impedance matching
Rationale: NEC Article 100 defines "Bonding" as the permanent joining of metallic parts to
form an electrically conductive path that ensures electrical continuity and the capacity to
safely conduct any fault current.
4. For a commercial kitchen installation, the NEC mandates that all 125-volt, single-phase, 15-
and 20-ampere receptacles installed within how many feet of a sink must have GFCI
protection?
A) 3 feet
B) 6 feet
C) 8 feet
D) 10 feet
Rationale: NEC 210.8(B) requires Ground-Fault Circuit-Interrupter (GFCI) protection for all
15A and 20A, 125V receptacles installed within 6 feet from the top inside edge of the bowl
of the sink in non-dwelling locations. [1, 2]
5. When calculating box fill for an outlet box, how many conductor volume allowances must be
made for each yoke or strap containing one or more wiring devices?
A) One volume allowance
B) Two volume allowances
C) Three volume allowances
D) Zero volume allowances
Rationale: NEC 314.16(B)(4) states that for each yoke or strap containing one or more
devices, a double volume allowance (two allowances) must be counted based on the largest
conductor connected to a device on that strap. [1]
6. What is the minimum depth clearance required for burying direct-buried cables operating at
600 volts or less under a commercial driveway without a concrete slab?
A) 12 inches
B) 18 inches
, C) 24 inches
D) 36 inches
Rationale: Table 300.5 specifies that direct-buried cables under commercial driveways and
parking lots must have a minimum cover depth of 24 inches.
7. Under NEC rules, what is the maximum number of overcurrent devices permitted in a single
lighting and appliance branch-circuit panelboard?
A) 30
B) 42
C) 84
D) No limit (determined by design and physical space, historical 42-rule was
removed)
Rationale: Modern editions of the NEC removed the historical 42-circuit limitation for
panelboards. The capacity is now bounded by the panelboard's listing, physical space, and
heat ratings.
8. When an equipment grounding conductor is installed in a raceway, what color identification
must it feature if it is 6 AWG or smaller?
A) Solid white
B) Solid black
C) Green, or green with one or more yellow stripes
D) Bright orange
Rationale: NEC 250.119 mandates that equipment grounding conductors 6 AWG or smaller
must be identified by a continuous green outer finish or green with yellow stripes.
9. What is the maximum percentage of cross-sectional area that can be occupied by three or
more conductors inside any approved conduit or tubing raceway?
A) 31%
B) 40%
C) 53%
D) 60%
Rationale: Chapter 9, Table 1 of the NEC specifies that when three or more conductors are
pulled through a conduit, the maximum fill capacity cannot exceed 40% of the conduit's
cross-sectional area.
10. A continuous load on a branch circuit is a load where the maximum current is expected to
continue for how long according to NEC definitions?
A) 1 hour or more
B) 2 hours or more
C) 3 hours or more
D) 4 hours or more
Rationale: NEC Article 100 defines a continuous load as any structural load where the
maximum current is expected to run continuously for 3 hours or more. [1]
Guide |Best High-Yield Board-Style Practice
Questions with Detailed NEC, OSHA, and AZ ROC
Rationales (Latest 2026) PDF
Intro Summary:
Are you studying for the high-stakes Arizona CR-11 Residential and Commercial Electrical Contractor
Exam ? Don't leave your contracting license to chance! Pass the AZ ROC trade and regulatory assessment
on your very first attempt with this premium study bundle.
This study guide contains 100 highly realistic, board-style multiple-choice questions meticulously
drafted to align with the actual Arizona Registrar of Contractors (AZ ROC) and PSI testing specifications.
Each question features the correct answer clearly highlighted along with step-by-step mathematical
calculations, NEC code citations, OSHA safety rules, and Arizona contract law rationales .
Key Subject Areas Covered:
National Electrical Code (NEC) Core Mastery – Grounding & bonding sizing (Article 250), box fill
calculations, conduit spacing, and hazardous locations (Class I, Div 1).
Electrical Load Sizing & Calculations – Motor branch circuits (FLC/FLA parameters), continuous
commercial lighting adjustments (125% rule), 3-phase power calculations, and ampacity derating.
OSHA 1926 Construction Safety Protocols – Clear working space parameters (110.26),
Lockout/Tagout (LOTO) rules, arc flash mitigation, trenching depth egress, and PPE requirements.
Arizona Revised Statutes & Registrar of Contractors (AZ ROC) Law – CR-11 uncapped
contracting limits, 20-day preliminary notices, mechanics' liens, 60-day qualifying party
replacement timelines, and consumer protection surety bonds.
Accelerate your learning, eliminate exam day anxiety, and launch your electrical contracting business in
Arizona today!
Section 1: NEC Requirements, Grounding, and Bonding
1. According to NEC Article 250, what is the minimum size copper grounding electrode
conductor required for a service supplied by 3/0 AWG copper service-entrance conductors?
A) 8 AWG
B) 4 AWG
C) 6 AWG
D) 2 AWG
Rationale: Per NEC Table 250.66, for service-entrance conductors of 2/0 AWG or 3/0 AWG
copper, the minimum size of the grounding electrode conductor required is 4 AWG copper.
,2. What is the maximum distance permitted between supports for a vertical run of 2-inch Rigid
Metal Conduit (RMC) according to the NEC?
A) 10 feet
B) 12 feet
C) 14 feet
D) 20 feet
Rationale: NEC Table 344.30(B)(2) permits 2-inch RMC runs to be supported at intervals up
to 14 feet for vertical risers provided the conduit is made up with threaded couplings.
3. Which of the following is defined by the NEC as a reliable connection to ensure electrical
conductivity between metal parts required to be electrically connected?
A) Grounding
B) Bonding
C) Isolation
D) Impedance matching
Rationale: NEC Article 100 defines "Bonding" as the permanent joining of metallic parts to
form an electrically conductive path that ensures electrical continuity and the capacity to
safely conduct any fault current.
4. For a commercial kitchen installation, the NEC mandates that all 125-volt, single-phase, 15-
and 20-ampere receptacles installed within how many feet of a sink must have GFCI
protection?
A) 3 feet
B) 6 feet
C) 8 feet
D) 10 feet
Rationale: NEC 210.8(B) requires Ground-Fault Circuit-Interrupter (GFCI) protection for all
15A and 20A, 125V receptacles installed within 6 feet from the top inside edge of the bowl
of the sink in non-dwelling locations. [1, 2]
5. When calculating box fill for an outlet box, how many conductor volume allowances must be
made for each yoke or strap containing one or more wiring devices?
A) One volume allowance
B) Two volume allowances
C) Three volume allowances
D) Zero volume allowances
Rationale: NEC 314.16(B)(4) states that for each yoke or strap containing one or more
devices, a double volume allowance (two allowances) must be counted based on the largest
conductor connected to a device on that strap. [1]
6. What is the minimum depth clearance required for burying direct-buried cables operating at
600 volts or less under a commercial driveway without a concrete slab?
A) 12 inches
B) 18 inches
, C) 24 inches
D) 36 inches
Rationale: Table 300.5 specifies that direct-buried cables under commercial driveways and
parking lots must have a minimum cover depth of 24 inches.
7. Under NEC rules, what is the maximum number of overcurrent devices permitted in a single
lighting and appliance branch-circuit panelboard?
A) 30
B) 42
C) 84
D) No limit (determined by design and physical space, historical 42-rule was
removed)
Rationale: Modern editions of the NEC removed the historical 42-circuit limitation for
panelboards. The capacity is now bounded by the panelboard's listing, physical space, and
heat ratings.
8. When an equipment grounding conductor is installed in a raceway, what color identification
must it feature if it is 6 AWG or smaller?
A) Solid white
B) Solid black
C) Green, or green with one or more yellow stripes
D) Bright orange
Rationale: NEC 250.119 mandates that equipment grounding conductors 6 AWG or smaller
must be identified by a continuous green outer finish or green with yellow stripes.
9. What is the maximum percentage of cross-sectional area that can be occupied by three or
more conductors inside any approved conduit or tubing raceway?
A) 31%
B) 40%
C) 53%
D) 60%
Rationale: Chapter 9, Table 1 of the NEC specifies that when three or more conductors are
pulled through a conduit, the maximum fill capacity cannot exceed 40% of the conduit's
cross-sectional area.
10. A continuous load on a branch circuit is a load where the maximum current is expected to
continue for how long according to NEC definitions?
A) 1 hour or more
B) 2 hours or more
C) 3 hours or more
D) 4 hours or more
Rationale: NEC Article 100 defines a continuous load as any structural load where the
maximum current is expected to run continuously for 3 hours or more. [1]
