Safety — NASCLA Electrical Practice Questions

9 questions · 9% of the NASCLA Electrical exam

Worked questions

1. The one-line shows two possible sources to the maintenance point. What is required before work begins?

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

Why A is correct

Multiple sources can backfeed the work zone even when one source or control is off. The electrically safe work process requires complete source identification, isolation, lockout or tagout, stored-energy control, and a properly performed absence-of-voltage test.

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.

3. Before excavating a trench for site electrical raceways, what must the competent planning process address?

APlacing spoil directly at the trench edge
Utility locating and trench protection
COnly raceway fill
DDigging first to discover utilities

Why B is correct

Underground electrical work also carries struck-utility, cave-in, access, surcharge, and possible atmospheric hazards. A competent person and the required locating and protective processes must address these before and during excavation.

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

Why A is correct

The preferred control is de-energization and an electrically safe work condition. If an allowed justification exists, the employer must use the required energized-work planning, shock and arc assessments, boundaries, tools, PPE, and authorization rather than treating convenience as justification.

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

Why C is correct

Silica can cause irreversible lung disease. OSHA requires task assessment and specified engineering, work-practice, housekeeping, training, and respiratory controls rather than uncontrolled dry work.

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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Safety — NASCLA Electrical Practice Questions

Worked questions

1. The one-line shows two possible sources to the maintenance point. What is required before work begins?

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

3. Before excavating a trench for site electrical raceways, what must the competent planning process address?

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

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

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

3 more in the bank

Other NASCLA Electrical content areas