Electrician Red Seal · Question
An industrial facility requires grounding for a new 480 V, 3-phase motor control centre. The service entrance is configured as a solidly grounded wye system. Which of the following is the primary purpose of grounding the non-current-carrying metal parts of the motor control centre?
Grounding the non-current-carrying metal parts creates a low-impedance path to ground for fault currents. This path facilitates the rapid operation of overcurre
Start free practice for Electrician Red Seal
150 questions · no signup required · 40 free questions per day
Question: An industrial facility requires grounding for a new 480 V, 3-phase motor control centre. The service entrance is configured as a solidly grounded wye system. Which of the following is the primary purpose of grounding the non-current-carrying metal parts of the motor control centre?
Answer options:
- To provide a low-impedance path for lightning surges.
- To stabilize the system voltage during normal operation. ✅ To ensure proper operation of overcurrent protective devices during a ground fault.
- To reduce electromagnetic interference (EMI) between electrical equipment.
Correct answer: To ensure proper operation of overcurrent protective devices during a ground fault.
Explanation: Grounding the non-current-carrying metal parts creates a low-impedance path to ground for fault currents. This path facilitates the rapid operation of overcurrent protective devices (like circuit breakers or fuses), clearing the fault and preventing extended hazards.
Start free practice for Electrician Red Seal
150 questions · no signup required · 40 free questions per day
More about Electrician Red Seal
Related Questions
- A residential garage is to be wired with a 15 A, 120 V duplex receptacle. According to the Canadian Electrical
- During a renovation of a commercial kitchen, an electrician needs to replace an old single-phase, 240 V, 5 kW
- A commercial kitchen is being renovated, and several new 4 kW, 208 V, single-phase electric ovens are being in
- What is the minimum working space depth required in front of an electrical panel rated 200 A, 120/240 V, locat
- A Red Seal electrician is setting up temporary power for a construction site. The main temporary service is a
- A new industrial facility requires a 600 V, three-phase, 150 A feeder to supply a motor control centre. The co
More for Electrician Red Seal candidates
Practice tests
Question explanations
- A residential garage is to be wired with a 15 A, 120 V duplex receptacle. According to the Canadian Electrical
- During a renovation of a commercial kitchen, an electrician needs to replace an old single-phase, 240 V, 5 kW
- A commercial kitchen is being renovated, and several new 4 kW, 208 V, single-phase electric ovens are being in
- What is the minimum working space depth required in front of an electrical panel rated 200 A, 120/240 V, locat
Ready to practice?
Free, no signup required. Build a wrong-question list as you go.
Start Free Electrician Red Seal Practice →Related courses
Other Canadian certifications candidates often prepare for alongside this one.