E2 Cheat Sheet 2026

The 30 highest-yield E2 facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. Which branch of the essential electrical system in a hospital must power the fire alarm system? → Life safety branch
2. Which of the following circuits requires GFCI protection in a commercial building? → Receptacles in restrooms
3. An Optional Standby System under NEC Article 702 is intended to protect: → Business or property from inconvenience or financial loss
4. Which of the following is a standard ampere rating for overcurrent devices per NEC 240.6(A)? → 45 amperes
5. Equipment grounding conductors installed in conduit must be sized based on which NEC table? → Table 250.122
6. Under NEC Article 504, an intrinsically safe system is one in which any spark or thermal effect is incapable of causing ignition under which condition? → Both normal and abnormal conditions as specified
7. In spray application areas covered by NEC Article 516, the zone immediately surrounding open containers of flammable liquids is classified as: → Class I, Division 2 within 3 feet
8. Under the NEC, a motor controller must be capable of interrupting the stalled-rotor current of the motor it controls. This rating is known as the: → Locked rotor current (LRC)
9. Which of the following wiring methods is permitted by the NEC to be installed in direct contact with the earth (direct burial) when made of galvanized steel? → Rigid Metal Conduit (RMC)
10. If ten 12 AWG THHN copper current-carrying conductors are installed in a single conduit, what adjustment factor must be applied to their ampacity? → 50%
11. Which NEC section governs the illumination requirements for working spaces about electrical equipment? → NEC 110.26(D)
12. In a separately derived system from a transformer, where is the system bonding jumper installed? → At the source of the separately derived system or at the first disconnect
13. What is the minimum headroom in a high-voltage (over 1000V) working space per NEC 110.34(E)? → 7 feet
14. Under NEC Article 520 governing theaters, the dimmer system conductors in the stage switchboard area must be protected against: → Both overcurrent and short circuit using listed theatrical equipment
15. When inspecting a variable frequency drive (VFD) installation, which conductor issue is most critical to verify? → Conductor ampacity derating for harmonic heating
16. What is the minimum bend radius for a 1-inch EMT conduit field bend to the inside of the bend? → 4 inches
17. What is the primary purpose of reviewing electrical blueprints during plan review? → To verify compliance with applicable codes and standards
18. What is the maximum distance allowed between a motor disconnect and the motor it serves, per NEC 430.102(B)? → The disconnect must be within sight of the motor
19. NEC 210.8(B) requires GFCI protection for 125-volt through 250-volt receptacles in commercial kitchens located within how many feet of a sink? → 6 feet
20. Under NEC Article 330, Metal-Clad (MC) cable installed exposed in a commercial building must be supported at intervals not exceeding: → 6 feet
21. Per NEC Table 220.55, what is the maximum demand used when a commercial establishment has a single household cooking unit rated 12 kW? → 8 kW
22. Under NEC 240.4(D), what is the maximum overcurrent protection for 10 AWG copper conductors? → 30 amperes
23. NEC 230.70 requires the service disconnecting means to be installed: → Outside the building or inside nearest the point of entrance of service conductors
24. When parallel conductors are used, how must equipment grounding conductors be sized? → Each parallel set must contain a full-size EGC based on the overcurrent device
25. An emergency generator's fuel supply must be adequate to operate the system for a minimum of: → 4 hours at full load
26. A 100 HP, 460V, 3-phase motor has a FLC of 124 A per Table 430.250. Using dual-element time-delay fuses, what is the maximum fuse rating per NEC Table 430.52? → 225 A
27. Per NEC Table 430.52, the maximum rating of an inverse time circuit breaker for a Design B, squirrel cage motor branch circuit is: → 250% of FLA
28. A portable generator used as an Optional Standby source must be connected using a listed transfer device. The main reason is to prevent: → Backfeed to the utility system endangering line workers
29. A retail mall tenant has 500 linear feet of show window frontage. What minimum load must be added to the service calculation per NEC 220.14(G)? → 100,000 VA
30. Per NEC 450.14, transformers must be provided with a means to disconnect all ungrounded conductors. For a transformer rated over 600V, this disconnect must be: → Lockable in the open position if not within sight