WALMART MAINTENANCE Electrical Systems 2

Question 1

What is the National Electrical Code (NEC)?

Accepted Answer

The US standard for safe electrical installation and maintenance practices

Answer

The NEC (NFPA 70) is the widely adopted US standard that provides guidelines for safe electrical installation, wiring methods, and equipment to minimize fire and shock hazards.

Question 2

LED lighting is replacing fluorescent in many retail stores primarily because:

Accepted Answer

LEDs use less energy, last longer, and require less maintenance

Answer

LEDs offer significant advantages in energy efficiency (using 50-70% less energy), lifespan (50,000+ hours vs 20,000), and reduced maintenance costs.

Question 3

What should you do if you smell burning insulation near an electrical panel?

Accepted Answer

Evacuate the area, de-energize the panel from a safe distance if possible, and call for qualified help

Answer

Burning insulation indicates a serious electrical fault that could cause fire or arc flash. The area should be evacuated and power disconnected safely.

Question 4

What is an arc flash hazard?

Accepted Answer

An explosive release of energy caused by an electrical arc between conductors

Answer

An arc flash is an explosive release of energy that occurs when current flows through air between conductors, producing extreme heat (up to 35,000°F), pressure waves, and intense light.

Question 5

What tool is used to verify that a circuit is de-energized before working on it?

Accepted Answer

A voltage tester or multimeter

Answer

A voltage tester or multimeter measures voltage to confirm zero energy before work begins. Always test the tester on a known live circuit first to verify it is working.

WALMART MAINTENANCE Practice Test

WALMART MAINTENANCE Practice Test

WALMART MAINTENANCE Electrical Systems 2