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Rough Wiring — California C-10 Practice Questions

62 questions · 27% of the C-10 Electrical Trade exam

Worked questions

3. Illuminated PV source circuits are routed through an accessible service area. Which installation approach recognizes their energized condition?

  • Route, identify, and protect them using the applicable PV wiring rules
  • BOmit disconnect labeling
  • CTreat them as de-energized whenever the inverter is off for the described C-10 installation and documented operating conditions
  • DSplice them loose inside a raceway

Why A is correct

The best answer is: Route, identify, and protect them using the applicable PV wiring rules. Opening an inverter or AC disconnect may not de-energize illuminated source circuits. Proper routing, identification, guarding, and approved splicing are therefore essential. This transferred field condition tests the same installation or safety principle in a different project context. The other choices conflict with the cited rule, listing, safe-work process, or necessary diagnostic sequence.

4. Ten current-carrying conductors occupy a conduit above a boiler room. Which ampacity adjustments must be resolved before conductor selection?

  • Both conductor-count adjustment and ambient-temperature correction
  • BOnly raceway length
  • COnly the equipment-grounding conductor size for the described C-10 installation and documented operating conditions
  • DOnly system voltage

Why A is correct

The best answer is: Both conductor-count adjustment and ambient-temperature correction. Bundling and elevated ambient temperature both reduce allowable ampacity under applicable conditions. Raceway length and voltage may affect other design issues but do not replace these thermal corrections. This transferred field condition tests the same installation or safety principle in a different project context. The other choices conflict with the cited rule, listing, safe-work process, or necessary diagnostic sequence.

5. Two 4-inch raceways form a straight pull through a wireway. Which rule controls the minimum length in the pull direction?

  • AThe conductor insulation color for the described C-10 installation and documented operating conditions
  • BThe number of breaker spaces
  • The straight-pull sizing rule based on the largest raceway trade size
  • DThe building floor area

Why C is correct

The best answer is: The straight-pull sizing rule based on the largest raceway trade size. Pull-box dimensions for large conductors are determined from raceway arrangement and trade size so conductors can be installed without damage. Panel spaces, color, and floor area are unrelated. This transferred field condition tests the same installation or safety principle in a different project context. The other choices conflict with the cited rule, listing, safe-work process, or necessary diagnostic sequence.

57 more in the bank

Answers and explanations for these are in the app.

  • A building has multiple grounding electrodes that are present and qualify for use. What is the normal design approach?
  • A cable is sharply bent below the manufacturer’s minimum bending radius during rough-in. What should be done?
  • A concrete-encased electrode is available before the slab pour. What should the contractor do?
  • A conduit run exceeds the permitted total bend between boxes. What is required?
  • A device box is supported only by raceway where that support method is not permitted. What is required?
  • A downstream panel bonding screw connects neutral to the enclosure. What is the normal correction?
  • A long exposed PVC raceway crosses an area with a large temperature swing. What should be checked?
  • A metal raceway enters service equipment through a connection that may not provide reliable bonding. What should be evaluated?
  • A metal raceway system contains a section joined with a fitting not listed to provide grounding continuity. What is required?
  • A raceway is suspended from ceiling-grid support wires that are not identified for electrical use. What is the proper correction?
  • A separately derived transformer secondary is roughed without a system bonding jumper. What should be corrected?
  • A service raceway enters where water can collect. What must be addressed?
  • A straight pull contains large raceways entering opposite sides of a pull box. What controls the minimum box dimension along the pull?
  • Cable staples crush the jacket and deform conductors. What should occur?
  • Electrical equipment and raceways require seismic restraint under the project design. What should rough-in follow?
  • Equipment grounds from several cables enter one box. How are they handled in fill?
  • Final grading reduces cover over an underground branch circuit. What should occur?
  • In a feeder-supplied downstream panel, how should grounded and equipment-grounding conductors normally be arranged?
  • Metal raceway and fittings will be installed in a corrosive process area. What must be verified?
  • Multiple conduits pass through a rated floor opening. What controls firestop selection?
  • Nine current-carrying conductors share a raceway in a hot mechanical room. What must be evaluated before choosing conductor size?
  • NM cable passes through a bored framing hole very close to the nailing surface. What protection is appropriate?
  • Parallel phase conductors have different lengths and termination conditions. What is the concern?
  • Power and Class 2 control conductors share an enclosure without a barrier. What should be checked?
  • PV DC conductors are bundled against a hot roof with no temperature review. What must be evaluated?
  • PV source-circuit conductors remain energized whenever the array is illuminated. What rough-wiring practice follows from that characteristic?
  • PVC raceway enters fixed enclosures across a long sun-exposed run. What should be installed where calculated movement requires it?
  • THHN-only conductors are proposed inside an exterior underground raceway. What is the issue?
  • Twelve current-carrying conductors share a raceway in elevated ambient temperature. What must be applied?
  • A cluster of mixed-size conduits penetrates a rated floor. What information controls selection of the firestop system?
  • A concentric knockout connection at service equipment may not ensure an effective bond. Which rough-in issue must be evaluated?
  • A feeder supplies a panel in a detached building with an equipment grounding conductor. How should neutral and grounding terminations normally be arranged there?
  • A fixed enclosure anchors each end of a long rooftop PVC conduit. Calculated thermal movement is substantial. What fitting and installation details are needed?
  • A large cable shows a sharp field bend tighter than its published minimum. What should happen before the work is covered?
  • A long exposed PVC run is installed at the year's coolest temperature. Which movement issue must the installer accommodate?
  • A metal conduit path includes a fitting that is not identified for grounding continuity. What must be provided?
  • A new building has qualifying concrete-encased, metal water pipe, and ground-rod electrodes. How are they normally integrated?
  • A raceway run contains more total bend than its article permits between pulling points. What should the installer change?
  • A separately derived transformer is installed without the required system bonding and grounding connection. What needs correction?
  • A wall box hangs only from a raceway even though that wiring method does not allow raceway-only support. What must be added?
  • An equipment room contains corrosive vapor. What must be true of the raceways, fittings, enclosures, and fasteners selected?
  • An installer ties conduit to wires supporting a suspended ceiling, but those wires are not designated for electrical support. What correction is required?
  • An outdoor service raceway enters an enclosure at a low point where moisture accumulates. Which installation conditions must be addressed?
  • Before concrete placement, an electrician sees that the planned concrete-encased electrode connection is missing. What should happen?
  • Class 2 controls and power conductors occupy the same cabinet section. What determines whether this association is permitted?
  • Conductors marked only THHN are pulled through a raceway buried outdoors. What listing problem does the inspector identify?
  • Finish grading leaves an underground residential branch circuit with too little cover. What should be done before acceptance?
  • Fourteen current-carrying conductors share a sun-heated raceway. Which factors must be applied to the ampacity analysis?
  • Outdoor equipment hardware shows corrosion before commissioning. What suitability requirement applies?
  • Overdriven staples flatten a cable jacket and deform the insulated conductors. What corrective action is appropriate?
  • Parallel feeder conductors differ in length and terminate through dissimilar paths. Which operational problem can result?
  • Project documents require seismic restraint for raceways and equipment. Which details should guide rough-in?
  • PV conductors are tightly bundled just above a hot roof. What design checks must be completed before concealment?
  • Several cable equipment-grounding conductors enter one device box. Which box-fill rule accounts for them?
  • Several conduits pass through a listed two-hour wall assembly. How must the annular openings be restored?
  • The bonding screw remains installed in a feeder-supplied panelboard. What is the normal correction?
  • Type NM cable passes through framing less than the required distance from the finished nailing face. Which protection is appropriate?

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