10 exam-style questions with answers and explanations, straight from our 1,030-question bank. Tap an answer to check yourself. When you're ready, take the scored version in the free practice test.
The EC exam has 150 questions and runs 7 hours 30 minutes.
These 10 free EC questions are organized by exam domain, so you can see how each part of the Florida Certified Electrical Contractor Exam blueprint is tested. Reveal the answer and explanation under each question.
While commissioning a 75-kVA, 208-V, three-phase transformer serving a balanced panelboard, an electrician calculates secondary full-load current. Ignoring losses, the result is closest to:
Correct answer: C - 208 A
During commissioning, a clamp ammeter encircles both insulated conductors of a running 120-V single-phase pump circuit and reads nearly zero. A voltage check confirms the pump is energized and operating. What explains the current reading?
Correct answer: A - Outgoing and return magnetic fields cancel inside the clamp
An air-conditioning unit schedule shows MCA 42 A and MOCP 60 A. The installer proposes conductors with 40-A ampacity on a 50-A breaker. How should this proposal be reviewed?
Correct answer: B - Use conductors rated at least 42 A; the 50-A breaker is acceptable
Continuous lighting contributes 48 A to a feeder, and noncontinuous receptacles contribute 18 A. The equipment is not listed for 100% continuous loading. The feeder conductors must be rated at least:
Correct answer: D - 78 A
Testing a single service ground rod produces 38 ohms. A second qualifying rod is then installed 8 ft away and bonded to the grounding electrode system. The contractor should now:
Correct answer: A - Perform no further rod-resistance test for the supplemental-electrode rule
Inside a device box are two 12/2 cables with equipment grounding conductors, one duplex receptacle on a single yoke, and one internal cable clamp. Two 12 AWG pigtails originate and remain entirely inside the box. Using 2.25 in³ per 12 AWG allowance, the required minimum volume is:
Correct answer: C - 18.0 in³
At an industrial battery-charging area, engineering data show that an ignitible hydrogen-air mixture is likely during normal charging, not merely after equipment failure. The area is best identified as:
Correct answer: B - Class I, Division 1
Under the opposite-end 120% load-side bus arrangement, a 225-A panelboard has a 200-A utility main. With all other conditions met, the largest permitted PV breaker is:
Correct answer: D - 70 A
An electrician opens and locks the disconnect feeding a variable-frequency drive. The DC-bus indicator remains illuminated because stored energy has not dissipated. Before touching the conductors, the electrician must:
Correct answer: C - Control stored energy, then verify absence of voltage by live-dead-live testing
At the end of a 90-minute emergency-lighting test, a corridor measures 0.68 foot-candle average, 0.05 foot-candle at the darkest point, and a 36:1 maximum-to-minimum ratio. The test result is:
Correct answer: A - Noncompliant because the minimum is below 0.06 foot-candle
The EC exam also covers these domains. Drill them in the full free practice test:
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