Alabama Electrical Contractor Exam

Key Concepts

Business Legal Structures

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Risk Assessment Fundamentals Evaluate every risk on two dimensions: probability of loss and consequences of loss. A high-consequence/low-probability risk is handled differently than a low-consequence/high-probability risk. Risk is managed through contracts, safety programs, insurance, and bonding.

Property Insurance Types - Builder's Risk (All-Risk): Covers buildings under construction, including machinery, equipment, materials, supplies, and fixtures that are or will become part of the structure. Covers theft, vandalism, accidental losses, and damage. Construction must be in progress for coverage to apply. Does not typically cover poor workmanship, faulty design, or contractor's tools (tools require separate coverage). - Inland Marine: Covers property in transit and movable equipment not fixed at a permanent location. - Equipment Floater: Covers contractor's equipment and…

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Scheduling Methods (NASCLA Ch. 8)

Three main scheduling types — know when each is appropriate:

• Calendar Scheduling: Uses a standard calendar; links tasks to specific dates (deliveries, holidays, payment schedules). Best for small, simple projects. Easy to create but limited in scope.
• Bar Chart / Gantt Chart: Visual graphical depiction of activity duration and task sequence. Easy to read, good for mid-size projects. Critical weakness: does not show interdependencies between tasks — a delay in one task doesn't visually show the ripple effect on others.
• Critical Path Method (CPM): Shows interdependent relationships between tasks. Identifies the critical path — the sequence of tasks that determines total project duration. A one-week delay on any…

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Bid Package Components (NASCLA Ch. 6) A competitive bid package contains four core elements: - Invitation to bid – project overview, deadlines, general requirements - Bid instructions – how to complete and submit the bid - Bid forms – bid sheet, bid schedule, bidder's questionnaire (experience, financial responsibility), copy of contract - Supplements – property survey, soil analysis, other supporting documents

An addendum is issued when changes are made before bid due date. It becomes part of the bid documents and ultimately part of the contract. Always review addenda carefully — they can change your price or your decision to bid at all.

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OSHA Framework

• Established by the Occupational Safety and Health Act of 1970
• Key standards for contractors:
• 29 CFR 1926 – Safety and Health Regulations for Construction Industry
• 29 CFR 1910 – Occupational Safety and Health Standards
• 29 CFR 1904 – Recording and Reporting Occupational Injuries and Illnesses
• All employers must post the OSHA poster in a prominent location; on construction sites, it must be posted where employees report daily
• State plans must be at least as strict as federal OSHA standards

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Alabama Workers' Compensation (§25-5 et seq.)

Coverage Requirements & Exemptions - Employers with 5 or more employees must carry workers' compensation coverage. Fewer than 5 employees = exempt, but may elect coverage voluntarily. - "Employee" includes aliens, minors legally permitted to work, and all ages/sexes under any contract of hire (express or implied, oral or written). - Exempt categories include domestic servants, farm laborers, and certain casual employees not in the usual course of the employer's business.

Securing Payment: Two Options 1. Insurance — Purchase a policy from a licensed carrier. 2. Self-Insurance — Employer may self-insure with approval from the Department of Industrial Relations, typically requiring proof of financial solvency.

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Federal Employer Identification Number (EIN) - Required for any business with employees; obtained by filing IRS Form SS-4 (online application available at IRS.gov) - Must have EIN before hiring first employee; used on all federal tax filings and deposits

FICA Taxes (Social Security & Medicare) - Social Security: 6.2% employee + 6.2% employer = 12.4% combined (on wages up to the annual wage base) - Medicare: 1.45% employee + 1.45% employer = 2.9% combined (no wage cap) - Employer is responsible for withholding employee share AND paying the matching employer share

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Bookkeeping & Accounting Cycle (NASCLA Ch. 13): The cycle moves from recording transactions → posting to ledger → trial balance → adjusted trial balance → financial statements → analysis. Daily transactions are recorded in journals (cash receipts, purchases, cash disbursements, payroll, general). Posting transfers journal entries to the general ledger, which uses a numbered chart of accounts (Assets 1000–1999, Liabilities 2000–2999, Equity 3000–3999, Revenue 4000–4999, COGS 5000–5999, Expenses 6000–6999).

Debits and Credits: Assets and Expenses increase with debits; Liabilities, Equity, and Income increase with credits. Every entry must balance debit = credit.

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Required Elements of a Binding Contract (All 4 must be present)

1. Offer and Acceptance – Offer outlines work and compensation; acceptance is agreeing to terms (typically by signing). A counteroffer is NOT acceptance. Offers expire after a stated deadline or a "reasonable time" (court-determined).
2. Consideration – Both parties must exchange something of value (typically services for money).
3. Competent Parties – Parties must be of sound mind and legal capacity. Minors need parental consent; intoxicated or mentally disabled individuals may be ruled incompetent.
4. Legal Purpose – Contract must be performable, not harmful, and require no illegal activity. A contract requiring code-violating work is invalid.

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Who Qualifies (§35-11-210) Any mechanic, person, firm, or corporation who performs work/labor or furnishes material, fixtures, engines, boilers, waste disposal services, or machinery for any building or improvement on land qualifies for a lien. This includes those working under contract with the owner, proprietor, agent, architect, trustee, contractor, or subcontractor.

• Original contractors/direct claimants: Lien attaches to the full value of the building, improvements, and land (entire lot in a city/town; or one acre outside city/town).
• Employees of contractors or materialmen supplying to contractors: Lien is limited to the unpaid balance due the contractor by the owner.
• Exception — advance notice by materialman: If a materialman notifies the owner in writing before furnishing material (specifying…

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Board Composition & Appointments (§34-36-4)

• 9 members total, appointed by the Governor
• 7 members — one from each congressional district (7 districts)
• 2 at-large members — must be members of the Alabama State Electrical Workers Association
• All board members must be Alabama citizens and residents
• District members must be actively engaged in electrical construction with ≥5 consecutive years of electrical construction background and hold valid Electrical Contractor certificates
• Initial staggered terms:
• Districts 1, 2, 3 → 1-year terms
• Districts 4, 5, 6 → 2-year terms
• District 7 + at-large members → 3-year terms
• After initial terms: all members serve 3-year terms
• Terms expire June 30…

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Ohm's Law & Power The four fundamental relationships govern all DC circuit calculations: voltage (V), current (I), resistance (R), and power (P). These apply to both DC and AC resistive circuits.

Series vs. Parallel Circuits - Series: Current is the same throughout; voltage divides across resistors (V_total = V1 + V2 + ...); R_total = R1 + R2 + ... - Parallel: Voltage is the same across all branches; current divides; 1/R_total = 1/R1 + 1/R2 + ... - Combination circuits: Solve by reducing parallel sections to equivalents, then treat as series.

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Grounding Electrode System (NEC 250.52) All qualifying electrodes present at a building must be bonded together into a single grounding electrode system. Acceptable electrodes include: - Metal underground water pipe (in contact with earth ≥ 10 ft) - Metal in-ground support structure - Concrete-encased electrode (Ufer ground): ≥ 20 ft of rebar (½" min.) or ≥ 20 ft of #4 AWG bare copper encased in concrete - Ground ring: bare copper, minimum #2 AWG, buried ≥ 2.5 ft deep, encircling building, ≥ 20 ft total length - Rod and pipe electrodes: minimum 8 ft of contact with earth; ⅝" diameter for rods - Plate electrodes: minimum 2 sq ft of surface contact

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Conductor Insulation Types & Temperature Ratings - TW: 60°C, thermoplastic, wet/dry locations - THW / THWN: 75°C, thermoplastic, wet/dry locations - THHN: 90°C, thermoplastic, dry/damp only (limited to 75°C at terminals per 110.14(C)) - XHHW: 90°C dry/damp, 75°C wet — cross-linked polyethylene - RHW: 75°C, rubber, wet/dry locations - USE: 75°C, underground service entrance, sunlight resistant - Always confirm wet vs. dry rating — XHHW drops a temperature rating tier in wet locations

Ampacity & Correction/Adjustment Factors (NEC 310) - Base ampacity from NEC Table 310.12 (≤100A, residential) or Table 310.16 (0–2000V, 60°C through 90°C columns) - Temperature correction: apply when ambient exceeds 30°C — multiply ampacity by correction factor from Table 310.15(B)(1) - Adjustment factor (bundling/conduit…

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Conduit Fill (NEC Chapter 9, Tables 1, 4, 5) - Maximum fill percentages: 1 conductor = 53%, 2 conductors = 31%, 3+ conductors = 40% of conduit cross-sectional area (Chapter 9, Table 1) - Use Table 4 for conduit internal dimensions; use Table 5 for conductor cross-sectional areas - Nipples (≤24 in.) are permitted to be filled to 60%

Box Fill Calculations (Article 314) - Each conductor originating outside and terminating inside = 1 conductor count - Each conductor passing through = 1 conductor count - Each device (switch/receptacle) = 2 conductors worth of volume - Equipment grounding conductors: all EGCs together = 1 conductor count (based on largest EGC) - Cable clamps (internal): all clamps together…

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Hazardous Location Classification (Article 500–503)

• Class I: Flammable gases or vapors (e.g., paint booths, fuel storage)
• Class II: Combustible dusts (e.g., grain elevators, coal handling)
• Class III: Ignitible fibers/flyings (e.g., textile mills, sawmills)
• Division 1: Hazard present under normal operating conditions
• Division 2: Hazard present only under abnormal conditions (e.g., equipment failure)
• Wiring — Class I, Division 1 (501.10(A)): Threaded RMC or IMC required. PVC/RTRC only if encased in ≥2 in. of concrete.
• Wiring — Class I, Division 2 (501.10(B)): Adds PLTC, MI cable, MC-HL cable, and other methods permitted.
• Seals (501.15): Required within 18 in. of enclosures in Division 1; within 18 in. of enclosures in Division…

Alabama Electrical Contractor Exam | 3 Questions (~3%)

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Transformer Installation & Overcurrent Protection (NEC Article 450)

• Transformers 1000V and below require primary overcurrent protection at 125% of rated primary current (or next standard size up) per Article 450.3(B).
• If the transformer has a secondary rated 9A or more, secondary protection at 125% of rated secondary current is also required (or next standard size if 125% doesn't correspond to a standard rating).
• Transformers must be accessible and installed to prevent contact with combustible materials. Clearances and ventilation are required for air-cooled units.
• Insulation classes (e.g., Class 105, 130, 155, 180, 220+) indicate maximum temperature ratings — higher class = higher thermal…

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Branch-Circuit Conductor Sizing (NEC 430.22) Motor branch-circuit conductors must have an ampacity of not less than 125% of the motor's full-load current (FLC). Use FLC values from NEC Tables 430.247–430.250, not the nameplate current, for sizing conductors and protective devices.

Motor Overload Protection (NEC 430.32) Overload devices protect the motor windings from sustained overcurrent. Settings are based on motor nameplate full-load amperes (FLA): - Motors with a service factor ≥ 1.15 or temperature rise ≤ 40°C: 125% of nameplate FLA - All other motors: 115% of nameplate FLA - If the motor won't start or carry load at these settings, you may increase to 140% (SF ≥ 1.15) or 130% (all others)

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Circuit Classifications (Article 725 & 726)

Class 1 circuits operate at up to 600V and are wired using standard Chapter 3 wiring methods. They carry the most risk and have the most stringent installation requirements.

Class 2 circuits are power-limited to 100VA (or less depending on source type) at ≤30V. These are the lowest-risk circuits — thermostats, doorbells, low-voltage lighting controls. Cables are marked CL2.

Class 3 circuits allow higher voltage/power than Class 2 (up to 100V, higher VA) but remain power-limited. Cables are marked CL3. CL3 cable can substitute for CL2, but not vice versa.

Article 410 NEC 2023 | 3 questions, ~3% of exam

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Location Requirements (410.10)

• Wet locations: Luminaire must be marked "suitable for wet locations." Water cannot enter wiring compartments or lampholders.
• Damp locations: Luminaire must be marked suitable for wet or damp locations.
• Corrosive locations: Must be a type specifically suitable for corrosive environments (410.10(B)).
• Bathtub/Shower zone (410.10(D)): No cord-connected luminaires, lighting track, pendants, or paddle fans within 3 ft horizontally and 8 ft vertically from the top of the tub rim or shower threshold. Within the actual tub/shower footprint up to 8 ft high → must be damp-rated minimum; if subject to shower spray → must be wet-rated.

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Scope (600.1): Article 600 covers all electric signs, retrofit kits, and outline lighting regardless of voltage, including neon tubing, LED, HID, fluorescent, incandescent, and electroluminescent systems.

Listing & Labeling (600.3): All fixed, mobile, and portable electric signs, section signs, outline lighting, PV-powered signs, and retrofit kits must be listed and labeled. Exceptions: field-installed skeleton tubing (if Code-compliant) and outline lighting using listed luminaires wired per Chapter 3 do not require system listing.

Markings (600.4): - Signs must show manufacturer ID, input voltage, and current rating - Retrofitted signs must be marked indicating the illumination system was replaced, including installer/kit provider identity - Incandescent lampholder signs must show max wattage in letters ≥ 1/4 in. high, visible during…

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Article 760 – Fire Alarm Systems Overview

Article 760 governs all wiring and equipment for fire alarm systems, including circuits controlled and powered by the system (elevator capture, fan shutdown, door release, etc.).

Two circuit types — know the difference:

• NPLFA (Non-Power-Limited Fire Alarm): Higher voltage/power sources. Conductors must be copper, minimum 14 AWG (or 18 AWG for certain applications), with insulation rated for the voltage. Overcurrent protection must not exceed the ampacity of the conductors per 760.43. Power source and overcurrent protection follow standard branch circuit rules.
• PLFA (Power-Limited Fire Alarm): Source output is inherently limited. Covered under 760.130–760.179. More flexible wiring methods are allowed.

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Electrical Safety Program (ESP)

An ESP establishes the framework for how workers safely interact with electrical hazards. Key components include: hazard identification, risk assessment procedures, PPE selection criteria, training requirements, auditing, and documentation. NFPA 70E (referenced alongside NEC for safety practices) governs ESP requirements in the workplace.

Lockout/Tagout (LOTO) & Electrically Safe Work Condition (ESWC)

An Electrically Safe Work Condition requires all six steps: 1. Identify all energy sources 2. De-energize the equipment 3. Open disconnecting means 4. Apply lockout/tagout devices 5. Release or restrain stored energy (capacitors, springs, gravity) 6. Verify absence of voltage with a properly rated test instrument

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Fuse Classifications - Class H — 250V or 600V, 0–600A; non-current-limiting; lowest interrupting rating (10,000A) - Class K — Current-limiting capable; subdivided K1, K5; not marked "current-limiting" (important distinction) - Class R — Rejection-type (blade design prevents wrong fuse installation); 200,000A IR; RK1 and RK5 - Class J — 600V max, 200,000A IR; current-limiting; smaller physical size - Class L — 601–6000A; bolt-in; 200,000A IR; current-limiting - Class T — Fast-acting, compact, 300V or 600V; 200,000A IR - Class CC — 600V, 0–30A; 200,000A IR; time-delay available - Plug fuses — 125V max, 0–30A; Edison base or Type S (tamper-resistant)

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Branch Circuit Ratings (Article 210) Standard branch circuit ratings are 15, 20, 30, 40, and 50 amperes. The rating of a branch circuit is determined by the overcurrent protective device (OCPD) rating, not conductor ampacity. A single receptacle on a circuit must have an ampere rating not less than the circuit rating (210.21(B)(1)).

GFCI Protection (210.8) GFCI protection is required for 125V through 250V receptacles (15A and 20A) in: bathrooms, garages, outdoors, crawl spaces, unfinished basements, kitchens (within 6 ft of sink), boathouses, bathtub/shower areas, laundry areas, and rooftops. For dwelling units, all 15A and 20A, 125V through 250V receptacles in these locations require GFCI. Reconditioned GFCI devices are prohibited (210.2).