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The OK-ELEC exam has 100 questions and runs 4 hours.
These 10 free OK-ELEC questions are organized by exam domain, so you can see how each part of the Oklahoma Unlimited Electrical Journeyman Examination blueprint is tested. Reveal the answer and explanation under each question.
An industrial facility holds an Oklahoma annual electrical permit for alterations to an already-approved installation. During the permit term, electricians complete 14 separately identifiable alterations. At the end of the term, the annual-permit procedure requires the permit holder to:
Correct answer: B - File the detailed alteration record and account for the fee for each individual permit
At a 120/240-V single-phase panel, L1-to-L2 remains 240 V. With several 120-V loads operating, L1-to-neutral measures 78 V and L2-to-neutral measures 162 V; the two readings shift when loads are switched. The most likely fault is:
Correct answer: D - An open or high-resistance connection in the neutral
A leakage-capable clamp meter reads 18.0 A when clamped around the ungrounded conductor of a single-phase load. When clamped around all circuit conductors together, including the neutral, it reads 1.1 A. The 1.1-A residual indicates that:
Correct answer: A - Some current is returning on a path outside the clamped circuit conductors
A technician services a 480Y/277-V panelboard. With the cover removed, exposed live parts are on one side of the working space and a concrete wall is directly opposite. The clear depth is 40 inches. The working-space installation is:
Correct answer: C - The space is deficient because Condition 2 at 277 V to ground requires 42 inches
At a one-family dwelling in Oklahoma, a listed 240-V, single-phase, 30-A outdoor air-conditioning condensing unit is replaced in kind. The circuit is 120 V to ground, and no local rule is more stringent. Under Oklahoma's adoption of NEC 210.8(F), the correct conclusion is:
Correct answer: A - The outlet supplying the listed HVAC equipment remains excepted; 210.8(F) alone does not require GFCI protection
A listed rooftop air-conditioning unit is marked Minimum Circuit Ampacity 31 A and Maximum Overcurrent Protection 50 A. No other marking restricts the protective-device type. Select the branch-circuit arrangement that respects both nameplate values.
Correct answer: D - Conductors with at least 31-A allowable ampacity and a 50-A breaker
Available fault current at the line terminals of a branch circuit breaker is 22 kA. The panel main is rated 25 kA interrupting, but the branch breaker is rated 10 kA interrupting, and the equipment has no listed series rating. How should the branch-breaker arrangement be evaluated?
Correct answer: B - It is not acceptable; the branch device needs a sufficient individual rating or a listed series combination
A 300-A feeder supplies a 25-foot tap serving an 82-A calculated load. The tap is protected from physical damage and terminates in a single 90-A circuit breaker. Calculate the minimum allowable ampacity of the tap conductors under the 25-foot tap rule.
Correct answer: C - 100 A
A single rod electrode is fully installed, and a resistance test measures 38 ohms to earth. The contractor does not plan additional resistance testing. The minimum code-compliant next step is to:
Correct answer: D - Install a second rod at least 6 feet from the first; no test of the pair is required
A detached workshop is supplied by a four-wire feeder and has a local grounding electrode system. A clamp meter shows normal load current on the feeder equipment grounding conductor and bonded metal water piping. Inspection finds the feeder neutral bar bonded to the panel enclosure. To remove the objectionable current without defeating required grounding, the electrician should:
Correct answer: A - Isolate the neutral bar; retain the feeder EGC and all required equipment, piping, and electrode bonding
The OK-ELEC exam also covers these domains. Drill them in the full free practice test:
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