WALMART MAINTENANCE Electrical Systems

Question 1

What is the FIRST step before performing any electrical maintenance work?

Accepted Answer

Lock out and tag out (LOTO) the energy source

Answer

Lockout/Tagout ensures that electrical systems are de-energized and cannot be accidentally re-energized during maintenance, preventing electrical shock or electrocution.

Question 2

What does a GFCI outlet protect against?

Accepted Answer

Ground faults that could cause electrical shock

Answer

A Ground Fault Circuit Interrupter detects current leakage to ground and rapidly shuts off power, protecting against electrical shock, especially in wet locations.

Question 3

What is the standard voltage for commercial lighting circuits in a US retail store?

Accepted Answer

208/277 volts

Answer

Most commercial lighting in US retail stores operates on 208V or 277V single-phase circuits, which is more efficient than 120V for lighting loads.

Question 4

What color wire indicates a ground conductor in US electrical systems?

Accepted Answer

Green or bare copper

Answer

In US electrical wiring, green insulation or bare copper wire indicates the equipment grounding conductor, which provides a safe path for fault currents.

Question 5

A circuit breaker keeps tripping repeatedly. What should you investigate?

Accepted Answer

Investigate the circuit for overloads, short circuits, or ground faults

Answer

Repeated tripping indicates a problem on the circuit. Investigating for overloads, shorts, or ground faults identifies the root cause rather than masking a potentially dangerous condition.

WALMART MAINTENANCE Practice Test

WALMART MAINTENANCE Practice Test

WALMART MAINTENANCE Electrical Systems