Colorado journeyman electrician exam: prep + the real requirements

25 questions · Colorado practice set. Pick an answer for each, then check. Explanations cite the rule each question tests.

1. 1. The stated purpose of the National Electrical Code is:

   To serve as a design manual for engineersThe practical safeguarding of persons and property from hazards arising from the use of electricityTo guarantee an efficient installationTo set utility rates

2. 2. 'Ampacity' is defined as:

   The maximum current a conductor can carry continuously under the conditions of use without exceeding its temperature ratingThe nameplate current of the connected loadThe overcurrent device ratingShort-circuit withstand current

3. 3. A 'continuous load' is a load expected to run at maximum current for:

   1 hour or more2 hours or more3 hours or more24 hours

4. 4. Unless the equipment is rated otherwise, conductor terminations for circuits of 100A or less are sized using which ampacity column?

   90°C75°C60°C105°C

5. 5. Equipment interrupting rating must be:

   Equal to the load currentSufficient for the nominal circuit voltage and the current available at the line terminalsAt least 10,000A in all casesWhatever the panel label says

6. 6. An equipment grounding conductor with insulation must be colored:

   WhiteGrayGreen or green with yellow stripes (or be bare)Blue

7. 7. Illumination is required for working spaces around which equipment indoors?

   NoneService equipment, switchboards, panelboards and motor control centersReceptacles onlyLuminaires only

8. 8. Electrical equipment must be installed 'in a neat and workmanlike manner.' This enforceable requirement lives in:

   Article 90110.12210.1It is not enforceable

9. 9. In a completed installation, each disconnecting means must be:

   Painted redLegibly marked to indicate its purpose, unless the purpose is evidentLockedNumbered by the utility

10. 10. The dwelling bathroom receptacle circuit must be:

    15A shared with lightingAt least one 20A circuit supplying bathroom receptacles (it may serve one bathroom entirely, or receptacles in multiple bathrooms only)GFCI is optional on itA multiwire circuit

11. 11. Kitchen countertop receptacles must be installed so no point along the wall line of the counter is more than:

    12 in from a receptacle24 in from a receptacle (receptacles max 4 ft apart), with each counter space 12 in or wider served36 in48 in

12. 12. Unless specifically permitted otherwise, the maximum overcurrent protection for 14, 12 and 10 AWG copper conductors is:

    20A / 25A / 35A15A / 20A / 30A15A / 25A / 40A10A / 15A / 20A

13. 13. Per the standard ampacity table (75°C column, copper), 8 AWG THWN is rated:

    40A50A55A70A

14. 14. A neutral conductor is counted as a current-carrying conductor for adjustment purposes when:

    NeverIt carries only unbalanced current of a 3-wire, 2-phase-plus-neutral circuit or serves nonlinear loads on a 4-wire wye — then it countsAlwaysIt is aluminum

15. 15. Using the 10-ft feeder tap rule, tap conductors must:

    Have ampacity ≥ the calculated load, terminate in a single OCPD limiting the load to that ampacity, be enclosed, and not extend beyond the equipment they supplySimply be #10 or largerBe the same size as the feederBe fused at both ends

16. 16. The rating of a single cord-and-plug-connected appliance on a branch circuit with other loads must not exceed:

    100% of the circuit rating80% of the branch-circuit rating50% of the branch-circuit rating25%

17. 17. Ampacity correction for ambient temperatures above 30°C (86°F) is applied by:

    Ignoring temperatures below 45°CMultiplying table ampacity by the correction factor for the ambient, based on the conductor's insulation temperature ratingAdding 10% per 10°CUsing the 60°C column

18. 18. The main bonding jumper connects:

    Two ground rodsThe grounded (neutral) conductor to the equipment grounding conductors and enclosure at the service disconnecting meansThe meter to the polePhases together

19. 19. A single rod electrode must be supplemented by an additional electrode unless it has a resistance to earth of:

    5 ohms or less25 ohms or less50 ohms100 ohms

20. 20. Metal underground water pipe used as an electrode must be in contact with earth for at least 10 ft and:

    Nothing moreMust be supplemented by another electrode, with the connection made within the first 5 ft of entry (non-industrial)Be plastic-linedCarry a fuse

21. 21. Direct-buried UF cable for a 120V, 20A GFCI-protected residential branch circuit requires a minimum cover of:

    6 in12 in18 in24 in

22. 22. NM cable must be secured at intervals not exceeding ___ and within ___ of every box:

    6 ft / 24 in4.5 ft / 12 in3 ft / 8 in10 ft / 36 in

23. 23. EMT must be supported at least every ___ and within ___ of each box or termination:

    10 ft / 3 ft6 ft / 12 in8 ft / 2 ft4.5 ft / 12 in

24. 24. Where 4 AWG or larger conductors enter an enclosure, the entry must be protected by:

    A locknutAn insulating bushing or insulated-throat fittingDuct sealA reducing washer

25. 25. An isolated-ground receptacle is identified by:

    A green faceAn orange triangle on its face; its EGC runs insulated back toward the source but the box/system still gets a normal EGCA red dotThe letters WR