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Safety — NASCLA Electrical Practice Questions

9 questions · 9% of the NASCLA Electrical exam

Worked questions

1. A maintenance point can be energized by either a utility supply or a generator. What must be addressed before exposed electrical parts can be worked as deenergized?

  • Lock out every source and verify
  • BOpen only the utility breaker
  • CPress STOP and rely on the pilot light
  • DBegin after the generator engine stops

Where to look it up

https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.333

Why A is correct

Identify and isolate all sources, control stored energy, apply the required lockout/tagout procedure and have a qualified person verify the deenergized condition, including possible backfeed. A STOP button, stopped engine or opening only one source is insufficient.

2. An electrician must work from an elevated platform beside exposed electrical equipment. Which planning principle applies?

  • AA fall harness permits contact with energized parts
  • BOnly the faster task controls the work method
  • Control electrical and fall hazards together
  • DElectrical PPE eliminates fall hazards

Why C is correct

Simultaneous hazards must be assessed together because one control can affect the other. Proper platform or lift selection, fall protection, approach boundaries, de-energization planning, and rescue considerations must form one coordinated safe-work plan.

4. A worker proposes energized work solely because shutdown is inconvenient. What is the correct decision framework?

  • Establish an electrically safe work condition
  • BInconvenience automatically justifies energized work
  • COrdinary work clothes replace the risk assessment
  • DRemoving covers before planning reduces risk

Where to look it up

https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.333

Why A is correct

Shutdown inconvenience alone is not the stated basis for leaving exposed parts energized. Deenergize and establish the required safe work condition. Any exception must be justified under the applicable rules, with qualified personnel and appropriate protective work practices; it is not established merely by a preference to keep operating.

5. Concrete drilling creates respirable silica dust. What control approach is required?

  • AUse odor as the exposure test
  • BRemove tool guards
  • Use silica exposure controls
  • DDry sweep the dust

Where to look it up

https://www.osha.gov/laws-regs/regulations/standardnumber/1926/1926.1153

Why C is correct

Use the applicable OSHA silica-control approach for the drilling task, including the specified engineering and work-practice controls or the alternative exposure-control method. Respiratory protection depends on the task and applicable conditions; it is not automatically required for every drill operation. Uncontrolled dust and routine dry sweeping where they contribute to exposure are not acceptable substitutes.

6. A cable reel exceeds the forklift attachment rating. What should the supervisor do?

  • Use rated handling and a lift plan
  • BAdd workers beneath the reel
  • CGuess the load from reel color
  • DExceed the rating for a short lift

Why A is correct

Load weight, center of gravity, attachment rating, travel path, and personnel exclusion must be controlled. Brief duration does not increase equipment capacity or make an overhead load safe.

3 more in the bank

Answers and explanations for these are in the app.

  • Before testing a 480-volt panel, what must be confirmed about the test instrument?
  • A construction cord has exposed insulation and a missing grounding pin. What is required?
  • An electrical near miss reveals a failed energy-control step. What should management do?

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