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Arizona R-11 Electrical Residential Practice Exam

What This Practice Exam Covers

The Arizona R-11 Electrical Residential licensing exam consists of 110 questions delivered over 240 minutes, with a passing score of 70% (77 correct answers). The exam spans 14 topic areas drawn from the NEC, NFPA 72, OSHA 29 CFR 1926, and photovoltaic systems references.

This practice exam gives you two options:

• Free practice exam: 10 questions per attempt, drawn from a limited pool. You can retake it as many times as you like to get a feel for the question format, phrasing, and code-citation style before committing to a full study session.
• Full practice exam (paid): 110 questions with a 240-minute time limit, mirroring the real exam exactly. Questions are drawn from a pool of 568+ items, so each attempt presents a unique combination — you won't see the same exam twice. Every question maps to the official topic and subtopic list provided by the test provider.

Start with the free exam to calibrate where you stand, then use the full exam for serious exam prep.

What You'll Be Tested On

Service Feeders and Branch Circuits — 18 items (highest weight)
This is the single heaviest topic. Expect calculations: sizing branch-circuit conductors, applying 125% rules for motor loads, setting feeder overcurrent devices for multiple loads, and identifying where GFCI and AFCI protection is required in dwelling units. You must know which rooms and locations trigger AFCI requirements versus GFCI requirements — the exam distinguishes them precisely.

Grounding and Bonding — 16 items
The second-heaviest area. Questions pull from NEC Handbook Sections 250.66, 250.122, 250.28, 250.24, and 250.102, among others. You need to size equipment grounding conductors (EGCs) from Table 250.122, size grounding electrode conductors from Table 250.66, identify which AC systems must be grounded under Section 250.20(B), and apply the rules for made electrodes and ground rings. Know the difference between a main bonding jumper and a system bonding jumper per Article 100 definitions.

Raceways and Boxes — 15 items
Conduit fill calculations using Chapter 9, Table 1 and Table 5. Box fill calculations under Section 314.16(B) and Table 314.16(A). You must know maximum conductor counts in specific metal box sizes and minimum cover requirements from Table 300.5. Supporting and securing intervals differ by raceway type — EMT (Section 358.26), RMC (Section 344.26), IMC (Section 342.26), FMC (Section 348.30), and LFMC (Section 350.30) are all tested.

Conductors and Cables — 12 items
Ampacity from Table 310.15(B)(16) and Table 310.15(B)(17). Ambient temperature correction factors from Table 310.15(B)(1) (now Table 310.15(C)(1)). Adjustment factors for more than three current-carrying conductors from Table 310.15(B)(3)(a). Insulation types and temperature ratings from Table 310.104(A). Termination temperature limitations under Section 110.14(C) — a frequent trap when upsizing conductors.

Photovoltaics — 10 items
PV questions test system configurations (utility-interactive, stand-alone, bimodal, hybrid), I-V curve parameters, NEC Article 690 conductor sizing under Sections 690.7 and 690.8, overcurrent protection under Section 690.9, and system disconnecting means under Section 690.13(A). Also expect questions on solar radiation concepts — irradiance, insolation, peak sun hours — and array orientation optimization.

Overcurrent Protection — 7 items
Standard fuse and circuit breaker ratings, the next-size-up rule under Section 240.4(B), exceptions for specific conductor sizes under Sections 240.4(D) and 240.4(C), and motor branch-circuit overcurrent device maximum ratings from Table 430.52.

General Electrical Knowledge — 6 items
Ohm's Law (V = IR, P = IE), series and parallel circuit analysis, single-phase and three-phase electrical formulas, conductor ampacity from Article 100 definitions, and GFCI requirements. Calculations appear here — know how to work with watts, volt-amperes, kilowatts, and horsepower conversions.

Lighting — 6 items
Luminaire location requirements for wet/damp/closet/shower locations, lighting load calculations using Table 220.12, required lighting outlets in dwelling units, and recessed luminaire rules including Type IC versus non-IC and clearance requirements under Section 410.16(B) and 410.16(C)(1).

Fire Detection and Alarm Systems — 5 items
NFPA 72 rules for smoke detector placement and spacing, heat detector temperature ratings and color coding, notification appliance audible levels and the temporal evacuation pattern, and pathway class designations (Class A, B, C, N, X).

Safety — 5 items
OSHA 29 CFR 1926 questions covering employer accident prevention responsibilities (§1926.20(b)(2)), PPE payment obligations (§1926.95(d)(1)), lockout/tagout under NEC Section 110.25, fall protection six-foot rule (§1926.501(b)(1)), and employee training requirements (§1926.21(b)(5)).

Motors — 3 items
Conductor sizing at 125% of full-load current per Section 430.22, overload protection sizing per Section 430.32, Table 430.37 for overload unit placement, and feeder sizing per Section 430.24.

Special Occupancies and Equipment — 3 items
Residential smoke alarm placement, power supply requirements, and demand factors for clothes dryers (Table 220.54) and kitchen equipment (Table 220.56).

Low Voltage — 2 items
Fire alarm circuit classifications, PLFA cable types (FPL, FPLR, FPLP) per Section 760.2, and Class 2/Class 3 remote-control circuit requirements under Section 725.1.

Electrical Devices — 2 items
NEMA receptacle configurations, switch types (single-pole, three-way, four-way), grounding-type receptacle rules, and NEMA enclosure environmental ratings.

Worked Sample Questions

Question 1 — Service Feeders and Branch Circuits

What is the maximum overcurrent protection permitted for a Design B energy-efficient squirrel cage motor when using an instantaneous trip breaker?
A. 800% of full-load current
B. 250% of full-load current
C. 1100% of full-load current
D. 300% of full-load current

Correct Answer: C — 1100%

NEC Handbook, Table 430.52 sets maximum protective device ratings by motor type and device type. For a standard AC polyphase squirrel cage motor, the instantaneous trip breaker ceiling is 800%. Design B energy-efficient motors get a higher allowance — 1100% of full-load current — because their inrush characteristics differ. Candidates who choose A are applying the wrong motor type. This question rewards knowing the table distinctions, not just the general rule.
Source: NEC Handbook, Section 430.52, Table 430.52

Question 2 — Grounding and Bonding

The grounding electrode conductor for an AC system connected solely to a ground ring is not required to be larger than the conductor used for the ______.
A. largest ungrounded service conductor
B. grounded service conductor
C. ground ring
D. main bonding jumper

Correct Answer: C — ground ring

Per NEC Handbook, Section 250.66(C), when the grounding electrode conductor connects only to a ground ring and does not continue to other electrode types requiring larger conductors, it need not exceed the size of the ground ring conductor itself. Options A and B describe the standard Table 250.66 sizing method, which applies to other electrode types. This is a code-precision question — the answer changes completely depending on which electrode type is involved.
Source: NEC Handbook, Section 250.66(C)

Question 3 — Raceways and Boxes

A 4 × 1-1/4 inch round or octagonal metal box has a minimum capacity of 12.5 cubic inches. True or False?

Correct Answer: True

NEC Handbook, Section 314.16(A), Table 314.16(A) lists minimum volumes for standard metal boxes. A 4 × 1-1/4 inch round or octagonal box is listed at exactly 12.5 cubic inches. Box fill questions on this exam often require you to look up the box volume first, then calculate fill from Table 314.16(B) at a per-conductor allowance based on wire size.
Source: NEC Handbook, Section 314.16(A), Table 314.16(A)

How to Read Your Score

The passing threshold is 70% — 77 correct out of 110 questions. Treat your first practice attempt as a diagnostic, not a verdict. A score of 65% on your first run doesn't mean you're failing; it means you have a map of where to focus.

Use the topic breakdown. If you scored 90% on Electrical Devices (2 items) but 50% on Grounding and Bonding (16 items), the math tells you where to spend your study hours. Grounding and Bonding alone accounts for nearly 15% of the exam — a poor score there can sink an otherwise solid attempt.

A score in the 72–76% range on practice should prompt caution. The real exam draws from a broader question pool, and questions are worded to test precision. Scoring just above the line on practice often means you're passing familiar questions but will struggle with differently worded versions of the same concepts. Aim for 80%+ on practice before scheduling the real exam.

The 568+ question pool in the full practice exam ensures you're seeing varied phrasing and scenario types, not memorizing a short list. Repeated full attempts will steadily expose weaker code areas.

Where Candidates Lose Points

Misapplying correction and adjustment factors simultaneously. Conductors subject to both ambient temperature above 30°C and more than three in a raceway require both the Table 310.15(C)(1) correction factor and the Table 310.15(B)(3)(a) adjustment factor applied in sequence. Candidates apply one and skip the other.

Wrong table for grounding electrode conductor vs. equipment grounding conductor. Table 250.66 sizes the grounding electrode conductor; Table 250.122 sizes the EGC. Swapping them is one of the most common Grounding and Bonding errors.

Conduit fill with mixed conductors. When conductors aren't all the same size, Chapter 9, Table 5 dimensions must be used for each conductor individually before applying the Chapter 9, Table 1 fill percentage. Candidates who eyeball this or use a single-size shortcut get the wrong conduit size.

Instantaneous trip breaker percentages by motor design. Table 430.52 has separate columns for motor type — Design B energy-efficient motors at 1100% versus standard types at 800%. Missing the column costs a point.

Time management on calculation-heavy sections. Service Feeders and Branch Circuits (18 items) and Raceways and Boxes (15 items) together represent 30% of the exam and both demand multi-step arithmetic. Candidates who work slowly through these sections run out of time before reaching Photovoltaics (10 items), leaving questions blank.

GFCI versus AFCI location confusion. The exam tests both, and the required locations are distinct. Conflating them — or assuming one covers the other — drops points in the Service Feeders and Branch Circuits topic.

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