TN LLE Cheat Sheet 2026

The 30 highest-yield TN LLE facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. Which of the following wiring methods is required for branch circuits serving patient care spaces in a health care facility? → A metal raceway or a cable with a metallic sheath.
2. A commercial occupancy has 100 general-purpose duplex receptacles. What is the calculated load for these receptacles after applying demand factors? → 14,000 VA
3. What is the minimum burial depth for UF cable installed under a residential driveway per NEC Table 300.5? → 24 inches
4. A transformer nameplate shows 5% impedance and 75 kVA rating at 240V secondary. What is the maximum available fault current at the transformer terminals? → 6,250 amperes
5. What is the maximum total degrees of bends permitted in a single run of conduit between two pull points (e.g., from one junction box to another)? → 360 degrees
6. What is the purpose of motor overload protection separate from the branch circuit breaker? → To protect the motor windings from sustained overcurrent that would cause overheating
7. What is the maximum number of 12 AWG THHN conductors permitted in a 3/4-inch EMT conduit per NEC Chapter 9? → 12
8. When pulling conductors through a conduit, what is the maximum recommended pulling tension for copper conductors to avoid damage? → 0.008 x cmil per conductor
9. In a commercial garage used for major vehicle repair, which area is generally classified as a Class I, Division 2 hazardous location? → The area from the floor up to a level of 18 inches above the floor.
10. According to OSHA standards, how often should electrical safety training be provided to employees who work with or near electricity? → Annually
11. Per NEC 430.102, a motor disconnecting means must be located where relative to the motor? → Within sight from the motor location and the controller
12. According to Tennessee regulations, what is the penalty for performing electrical work without proper licensure? → Civil penalties, potential misdemeanor charges, and requirement to obtain proper licensure
13. Type SE (Service Entrance) cable used for branch circuit or feeder wiring inside a building is governed by which NEC article? → NEC Article 338
14. A feeder is installed to supply a subpanel in a detached garage. Which of the following is required for the feeder? → It must include an equipment grounding conductor.
15. What is the calculated general lighting load for a 20,000 sq. ft. office building after applying all applicable demand factors? → 41,250 VA
16. Per NEC 240.86, what is the maximum distance for a series-rated system where the line-side device protects load-side devices? → No distance limit as long as the combination is tested and listed
17. Per NEC 210.12, where is AFCI protection required in a dwelling unit? → All areas except bathrooms, garages, and outdoors
18. Per NEC 250.30, what grounding requirements apply to a separately derived system such as a transformer? → A system bonding jumper and grounding electrode conductor must be installed at the source
19. Per NEC Chapter 9, Table 1, what is the maximum conduit fill percentage for one conductor installed in a raceway? → 53%
20. What is the relationship between voltage, current, and resistance known as? → Ohm's law
21. Under NEC 300.22(C), wiring installed in a plenum ceiling space used for air handling must: → Use only plenum-rated cables or wiring enclosed in metal conduit
22. What is the significance of using a Ground Fault Circuit Interrupter (GFCI) in wet or damp locations? → To prevent electrical shocks
23. What is I squared t and why is it important in overcurrent protection? → Current squared times time — measures total energy let-through during a fault
24. What conductor type is required for wet locations per NEC 310.10(C)? → Any conductor rated for wet locations such as THWN, XHHW, or USE
25. According to Tennessee licensing requirements, can a Limited Licensed Electrician install a central air conditioning system in a new commercial building? → No, this typically requires a full electrical contractor license
26. What is the formula for calculating apparent power in a single-phase AC circuit? → S = V x I
27. Per NEC 430.6, what current value is used for determining conductor size and overcurrent protection for a motor? → NEC table full-load current values
28. Per NEC 110.26(A)(1), what is the minimum clear working space depth in front of electrical equipment operating at 120 to 250 volts (Condition 1)? → 36 inches
29. Per NEC 250.122, what is the minimum size equipment grounding conductor for a circuit protected by a 60-ampere overcurrent device? → 10 AWG
30. What is the minimum service size required for a single-family dwelling per NEC 230.79(C)? → 100 amperes