Equipment for General Use — NASCLA Electrical Practice Questions

13 questions · 13% of the NASCLA Electrical exam

Worked questions

1. The commissioning table shows unbalanced phase currents and repeated overload trips. What should be done first?

ABypass one phase
BRemove equipment grounding
Diagnose before changing overloads
DIncrease overload settings until it runs

Why C is correct

Current imbalance can rapidly overheat a motor; raising protection without correcting the cause risks damage and fire. The best answer is therefore “Investigate supply, connections, load, and motor condition before changing overload settings.” The other choices either address a different system, rely on an unsafe shortcut, or make a conclusion not supported by the stated facts.

2. The plan shows AC-1 around the corner from its only disconnect. What is needed at the equipment?

AAn extension cord
A properly rated located disconnect
CA thermostat only
DA panel directory in another building

Why B is correct

Service personnel need a local means to isolate the equipment; control circuits and remote documentation do not provide equivalent disconnection. The best answer is therefore “A properly rated disconnect at the required location.” The other choices either address a different system, rely on an unsafe shortcut, or make a conclusion not supported by the stated facts.

3. On a restaurant build-out during plan review, field calculations conflict with an air-conditioner's marked minimum circuit ampacity and maximum overcurrent protection; what normally governs?

Apply the marked equipment values
BUse the smallest conductor available
CMatch overcurrent protection to running current only
DIgnore the nameplate

Why A is correct

Listed HVAC markings incorporate equipment-specific conductor and protection considerations and are central to branch-circuit selection. The best answer is therefore “Use the marked values with the applicable equipment rules.” The other choices either address a different system, rely on an unsafe shortcut, or make a conclusion not supported by the stated facts.

4. On a school modernization during plan review, a grounding-type receptacle is installed on an ungrounded circuit without an equipment grounding path; what is an allowed strategy when properly implemented?

AAttach ground to a water faucet
BLeave a false equipment-ground indication
Use a permitted labeled GFCI replacement
DConnect ground to neutral at the receptacle

Why C is correct

GFCI protection can be an allowed replacement approach with labeling, but it does not create an equipment-grounding conductor and neutral-ground bonding downstream is improper. The best answer is therefore “Use an applicable GFCI replacement method with required labeling.” The other choices either address a different system, rely on an unsafe shortcut, or make a conclusion not supported by the stated facts.

5. A motor overload setting is raised to stop nuisance trips without diagnosing current. What should happen?

ARemove grounding
Restore compliant protection and diagnose motor, supply, and load
CBypass overloads permanently
DIncrease short-circuit protection only

Why B is correct

Overloads protect windings from sustained heating. Repeated trips can reveal voltage imbalance, mechanical load, cooling, or motor defects that must be corrected before settings are changed.

6. A switchboard has an opening that exposes energized parts after a required dead-front barrier was removed. What is required before normal use?

Restore the listed guarding barrier
BMark the floor with tape only
CIncrease the feeder rating
DLeave it open for cooling

Why A is correct

Electrical equipment must guard energized parts from accidental contact during normal access. Floor markings, larger conductors, or added ventilation do not replace the listed enclosure barrier.

7. Rear-access switchboard doors open into stored material. What is required?

ALock the rear doors
BUse storage as an arc barrier
Clear the required access and working space
DIncrease bus rating

Why C is correct

Rear-access equipment needs the working clearance and egress required by its exposed parts and service method. Storage obstructs maintenance and can add combustible material.

6 more in the bank

Answers and explanations for these are in the app.

On a small hospital renovation during plan review, dry-type transformer ventilation openings are blocked by stored materials; what should be corrected?
On a warehouse conversion during plan review, a machine disconnect is difficult to identify among several adjacent disconnects; what should be provided?
On a multifamily project during plan review, a stationary battery installation is planned in a small enclosed room; what hazards require coordination?
On a retail shell project during plan review, EV charging equipment will be installed where vehicles may strike it; what must the design include?
A fixed appliance requires servicing but has no permitted disconnecting means. What must be provided?
A disconnected capacitor bank is assumed safe immediately. What is the concern?

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Equipment for General Use — NASCLA Electrical Practice Questions

Worked questions

1. The commissioning table shows unbalanced phase currents and repeated overload trips. What should be done first?

2. The plan shows AC-1 around the corner from its only disconnect. What is needed at the equipment?

3. On a restaurant build-out during plan review, field calculations conflict with an air-conditioner's marked minimum circuit ampacity and maximum overcurrent protection; what normally governs?

4. On a school modernization during plan review, a grounding-type receptacle is installed on an ungrounded circuit without an equipment grounding path; what is an allowed strategy when properly implemented?

5. A motor overload setting is raised to stop nuisance trips without diagnosing current. What should happen?

6. A switchboard has an opening that exposes energized parts after a required dead-front barrier was removed. What is required before normal use?

7. Rear-access switchboard doors open into stored material. What is required?

6 more in the bank

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